| RAM | 256 GB |
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- Your Rescue Plan documents will be delivered to you via email only to the address associated with your Amazon.com account and can be found in your account message center within the Buyer/Seller Messages
- If your drive stops working, the Rescue data recovery plan will attempt to recover the data from the failed drive and recovered data will be returned on a media storage device or via secure cloud-based data storage.
- Covers new removeable flash memory device of any brand when purchased within 30 days (receipt must be retained for purchases not on the same transaction).
- Free shipping for in–lab data recovery; 24/7 online case status tracking
- If your data isn’t recovered, you get your money back.
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From the manufacturer
At a Glance:
- Solid state performance in a USB 3.1 flash drive (2)
- Read speeds of up to 420MB/s; write speeds of up to 380MB/s (2)
- Sophisticated design with durable aluminum casing
- Password protection and 128-bit AES file encryption software (5)
- RescuePRO Deluxe data recovery download (6)
- Backed by a lifetime limited warranty (6)
SanDisk Extreme PRO USB 3.1 Solid State Flash Drive
The SanDisk Extreme PRO USB 3.1 Solid State Flash Drive delivers super-fast solid state performance in a USB 3.1 flash drive (2). A game-changer in the USB storage category, this flash drive offers read speeds of up to 420MB/s and write speeds of up to 380MB/s (2) that let you transfer content fast. Available in capacities up to 256GB (1), this USB 3.1 flash drive provides plenty of room to easily manage even massive files. The sophisticated aluminum design is both stylish and durable, and the included SanDisk SecureAccess software with 128-bit file encryption and password protection ensures that your private files stay private (5). The SanDisk Extreme PRO USB 3.1 Solid State Flash Drive is backed by a limited lifetime warranty (7) for added peace of mind.
SanDisk products are constructed to the highest standards and rigorously tested. You can be confident in the outstanding quality, performance and reliability of every SanDisk product.
What's in the box?
- SanDisk Extreme PRO USB 3.1 Solid State Flash Drive
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Speeds Of Up To 420MB/s Read And 380MB/s WriteBlazing-fast performance lets you transfer a full-length 4K movie to the drive in less than 15 seconds (2) or 1,000 photos in less than 25 seconds (3). |
Solid State USB 3.1 Flash DriveThe SanDisk Extreme PRO USB 3.1 Solid State Flash Drive delivers the performance, capacity, and reliability of an SSD in the ultimate portability of a USB flash drive. |
Sandisk SecureAccess Software Protects Your PrivacyCreate a private folder on your drive with SanDisk SecureAccess software. This 128-bit AES encryption software makes it easy to password-protect critical files (5). Drag and drop files into the vault, and they'll be protected. |
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Easy File Recovery With RescuePRO Deluxe SoftwareThe drive comes with a RescuePRO Deluxe data recovery software download offer (5). This software makes it easy to recover files that have been accidentally deleted (download required). |
Compatible With USB 3.0 And 2.0 PortsThe SanDisk Extreme PRO USB 3.1 Solid State Flash Drive is backward-compatible with USB 3.0 and 2.0. |
Choose The Amount Of Storage You NeedThe amount of capacity you need depends on the types and number of files you have and their size. The chart above gives you an idea of how many photos, videos, and music and office files you can store for each capacity. |
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| SanDisk Extreme PRO USB 3.1 Solid State Flash Drive, 128GB | SanDisk Extreme PRO USB 3.1 Solid State Flash Drive, 256GB | |
| Capacity | 128GB | 256GB |
| Read Speed (up to) | 420MB/s | 420MB/s |
| Write Speed (up to) | 380MB/s | 380MB/s |
| USB 3.1 enabled (USB 3.0/2.0 compatible) | ✓ | ✓ |
| SanDisk SecureAccess software | ✓ | ✓ |
| RescuePRO Deluxe recovery software (download required) | ✓ | ✓ |
| Operating temperature | 32°F to 95°F (0°C to 35°C) | 32°F to 95°F (0°C to 35°C) |
| Storage temperature | 14°F to 158°F (-10°C to 70°C) | 14°F to 158°F (-10°C to 70°C) |
| Drive dimensions | 0.45 x 0.84 x 2.79 in. (11.0 x 21.0 x 71.0 mm) | 0.45 x 0.84 x 2.79 in. (11.0 x 21.0 x 71.0 mm) |
Legal Disclaimers
(1) Read speeds up to 420MB/s, write speeds up to 380MB/s. USB 3.1 Gen 1 or USB 3.0 port required. Based on internal testing; performance may be lower depending upon host device. 1MB=1,000,000 bytes.
(2) Based on 4K video transfer (4GB) with USB 3.1, Gen 1 or USB 3.0 host device. Results may vary based on host device, file attributes and other factors.
(3) Based on 4GB transfer of 1000 photos (avg. file 4MB) with USB 3.1, Gen 1 or USB 3.0 host device. Results may vary based on host device, file attributes and other factors.
(4) Password protection uses 128-bit AES encryption and is supported by Windows Vista, Windows 7, Windows 8, Windows 10, and Mac OS X v10.7+ (Software download required for Mac, see SanDisk website for more details).
(5) Registration required; terms and conditions apply.
(6) 30 years in Germany, Canada and regions not recognizing lifetime warranty.
(7) 1GB = 1,000,000,000 bytes. Actual user storage less.
Western Digital Technologies, Inc. is the seller of record and licensee in the Americas of SanDisk products.
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| Customer Rating | (6887) | (2366) | (336) | (18662) | (28820) | (4579) |
| Price | $58.99 | $29.99 | $59.99 | $22.99 | $32.97 | $19.00 |
| Shipping | FREE Shipping. Details | FREE Shipping. Details | FREE Shipping. Details | FREE Shipping on orders over $25.00 shipped by Amazon or get Fast, Free Shipping with Amazon Prime | FREE Shipping. Details | FREE Shipping on orders over $25.00 shipped by Amazon or get Fast, Free Shipping with Amazon Prime |
| Sold By | Amazon.com | NY & DD | Amazon.com | Amazon.com | Amazon.com | Amazon.com |
| Color | Black | — | — | Gunmetal Gray | Silver | — |
| Digital Storage Capacity | 256 GB | 128 GB | 256.0 GB | 128.0 GB | 256.0 GB | 64 GB |
| Hardware Interface | USB | USB | USB 3.0 | USB 3.0 | USB 3.0 | USB 3.0 |
| Item Dimensions | 2.79 x 0.84 x 0.45 inches | 2.23 x 0.71 x 0.34 inches | 2.79 x 0.84 x 0.45 inches | 0.9 x 0.7 x 0.3 inches | 1.58 x 0.61 x 0.47 inches | 0.45 x 0.84 x 2.79 inches |
| Item Weight | 0.64 ounces | 0.71 ounces | 0.64 ounces | 0.16 ounces | 0.04 ounces | 0.64 ounces |
| Memory Storage Capacity | 256 GB | 128 GB | 256.0 GB | 128 GB | 256 GB | 64 GB |
Customer Questions & Answers
Customer reviews
Top reviews from the United States
There was a problem filtering reviews right now. Please try again later.
Reviewed in the United States on November 15, 2017
Size: 256GBStyle: Flash DriveVerified Purchase
Reviewed in the United States on December 9, 2017
Size: 256GBStyle: Flash DriveVerified Purchase
Reviewed in the United States on March 20, 2018
Size: 128GBStyle: Flash DriveVerified Purchase
Quality control issues?
By Chris W. on March 20, 2018
Item was SUPER fast - for about ~30 minutes. Then, it failed. No matter the OS (Linux, Windows 10, OSX), no matter the system, the device shows up as a 0 GB removable device with no media in it. Looks like a controller failure. Really, really disappointing for the cost.
By Chris W. on March 20, 2018
Images in this review
Reviewed in the United States on May 20, 2018
RECOMMENDATION: About the only thing you can do is: a) disconnect the drive when not in use, especially detrimental would be to put a movie on it, and play it for over an hour, b) place the drive on a heat conducting surface or force cool it by blowing a fan on it, NOTE: these only apply to someone who has already purchased this drive. For everyone else, buy another driver that does not have an inherent heat problem.
Update (07/2018): Drive has failed; neither a Windows 10 nor MacBook Pro computer will recognize it. Upon reading more into the reviews, and lot of people have had issues with this drive failing.
Pros: Good transfer speed (+100 MBps). Tested on a Dell Inspirion 8920 through the USB 3.1 port (on the back of the computer).
Cons: Drive gets unusually warm (compared to other USB flash drives) during idle (non-transfer, just plugged in). This drive was 17 degrees F over ambient temperature (84F). The metal shell appears to dissipate some heat over the plastic cased San Disk Extreme (non-Pro) 64GB version, which was 24F over ambient. The Kingston was 8 degrees F over ambient. And a PNY Attache 64GB 3.0 (plastic case) was 12 degrees F over ambient. Temperature was measured with a IR thermometer (link below).
Other USB flash drives compared to:
[[ASIN:B01MU8TZRV SanDisk SDCZ880-128G-G46 Extreme PRO 128GB USB 3.1 Solid State Flash Drive]]
[[ASIN:B075KRVHMS Kingston Digital 32GB DataTraveler Elite G2 Black Metal Casing Fast 180MB/s R, 70MB/W USB 3.1 Flash Drive with LED light indicator (DTEG2/32GB)]]
[[ASIN:B01NARBPI7 Sandisk Extreme Go 64GB USB 3.0 (3.1 Gen 1) Type-A USB Flash Drive - SDCZ800-064G-G46]]
Infrared Thermometer:
[[ASIN:B013X0NQT0 Etekcity 1022 Digital Laser Infrared Thermometer Temperature Gun Non-contact -58℉~1022℉ (-50℃ ~ 550℃) with Adjustable Emissivity & Max Measure for Meat Refrigerator Pool Oven]]
Size: 128GBStyle: Flash DriveVerified Purchase
Transfer speeds are Xtremely FAST; until it crashes and burns, and takes your data with it!
By aTypicalEngineer808 on May 20, 2018
Update (09/2018): Added pictures of how to teardown this drive. 1) use a 3/8" wooden dowel to drive the inner plastic body out from the metal outer casing, 2) use a small flat tip screwdriver to split the black plastic inner case (there are cut-outs), 3) the circuit board is encased in a white plastic holder, which is what slides in/out; to separate, carefully use a smaller flat tip screw driver to pop the retention tabs (four). Once I had the unit apart, I plugged the DEAD drive in; windows sees some sort of device, but no logical partition, so the following temperatures are of the drive sitting idle (in earlier tests, temperature increased during file copy operations); after being ON for 10-15 minutes, the temperature rose from ambient (80F) to a high of 127F. As I had received a replacement drive from Sandisk, I decided that I would modify the working one in an attempt to further its lifespan but improving air-flow around the circuit board. I drilled additional holes in the white plastic sleeve, on both sides (see the comparison pictures), and I plan on leaving the rest of the drive case (black plastic and metal) removed. This drive will be used to transfer files between computers, but without the outer case, it will not be leaving my desk area. Will update again at a later date if (when) this drive fails again. On a side note, the flash chip, which is the larger of the two is the one that had the highest temperature; however, given the confined case and ZERO airflow, i'm sure the entire board will eventually reach thermal equilibrium, e.g. the entire circuit board will be at or over 127F.By aTypicalEngineer808 on May 20, 2018
RECOMMENDATION: About the only thing you can do is: a) disconnect the drive when not in use, especially detrimental would be to put a movie on it, and play it for over an hour, b) place the drive on a heat conducting surface or force cool it by blowing a fan on it, NOTE: these only apply to someone who has already purchased this drive. For everyone else, buy another driver that does not have an inherent heat problem.
Update (07/2018): Drive has failed; neither a Windows 10 nor MacBook Pro computer will recognize it. Upon reading more into the reviews, and lot of people have had issues with this drive failing.
Pros: Good transfer speed (+100 MBps). Tested on a Dell Inspirion 8920 through the USB 3.1 port (on the back of the computer).
Cons: Drive gets unusually warm (compared to other USB flash drives) during idle (non-transfer, just plugged in). This drive was 17 degrees F over ambient temperature (84F). The metal shell appears to dissipate some heat over the plastic cased San Disk Extreme (non-Pro) 64GB version, which was 24F over ambient. The Kingston was 8 degrees F over ambient. And a PNY Attache 64GB 3.0 (plastic case) was 12 degrees F over ambient. Temperature was measured with a IR thermometer (link below).
Other USB flash drives compared to:
[[ASIN:B01MU8TZRV SanDisk SDCZ880-128G-G46 Extreme PRO 128GB USB 3.1 Solid State Flash Drive]]
[[ASIN:B075KRVHMS Kingston Digital 32GB DataTraveler Elite G2 Black Metal Casing Fast 180MB/s R, 70MB/W USB 3.1 Flash Drive with LED light indicator (DTEG2/32GB)]]
[[ASIN:B01NARBPI7 Sandisk Extreme Go 64GB USB 3.0 (3.1 Gen 1) Type-A USB Flash Drive - SDCZ800-064G-G46]]
Infrared Thermometer:
[[ASIN:B013X0NQT0 Etekcity 1022 Digital Laser Infrared Thermometer Temperature Gun Non-contact -58℉~1022℉ (-50℃ ~ 550℃) with Adjustable Emissivity & Max Measure for Meat Refrigerator Pool Oven]]
Images in this review
Reviewed in the United States on October 8, 2017
Size: 256GBStyle: Flash DriveVerified Purchase
Top reviews from other countries
Mr Williams
Not a True Solid State Drive, No SMART Data Reading Support, and Fast Write Speeds Won't Last
Reviewed in the United Kingdom on January 26, 2019Size: 128GBStyle: Flash DriveVerified Purchase
Not a True Solid State Drive, No SMART Data Reading Support, and Fast Write Speeds Won't Last
Reviewed in the United Kingdom on January 26, 2019
---------------------Reviewed in the United Kingdom on January 26, 2019
UPDATED REVIEW
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The first Extreme Pro 128GB 3.1 USB stick I received from Amazon started having write speed problems after I had transferred approximately 200GB to 250GB of data in total to it. I thought the Extreme Pro 3.1 USB stick I received was faulty so I got Amazon to send me a replacement.
Now the replacement I have received from Amazon is having the exact same problem. Again, like the first stick the problem starts after I have transferred a total of 200GB to 250GB of data to the Extreme Pro 128GB 3.1 USB stick. Just like the first Extreme Pro 3.1 USB stick that I received from Amazon, when I first started using this USB stick, I was able to transfer .mkv movie files to the stick at an incredibly steady 180MB/s transfer rate (with write cache disabled in Windows 10). The transfer speed is no longer steady when copying over the same .mkv movie files to the USB stick. The transfer speed is now fluctuating up and down between 20 MB/s to 175 MB/s. CrystalDiskMark is now showing the write speed at 121.6 MB/s when it use to be 240 MB/s. You could use the "SanDisk SSD Dashboard" software and select the "Wipe Media" option to completely erase the USB stick which will temporarily restore the USB stick's steady write performance, but after I transferred 10GB of data to the Extreme Pro USB stick, speeds are now fluctuating again. I also "low-level formatted" the Extreme Pro, but that made little difference.
I have come to the conclusion that the Extreme Pro 3.1 USB stick is missing 2 crucial features, and these 2 missing features are the reason the Extreme Pro 128GB 3.1 USB stick can not maintain its stable fast write speed performance after 200GB to 250GB of data in total writes has been written to it. Here are the 2 most important features that are missing from the Extreme Pro 3.1 USB stick:
1. TRIM support via UASP (which would of been possible with the Extreme Pro if SanDisk did add UASP support and support for translating the SCSI UNMAP command to ATA TRIM.)
Both the above features (UASP and TRIM - if the Extreme Pro had them) would have greatly helped to maintain the overall long-term speed performance of the Extreme Pro 3.1 USB stick.
SanDisk were made aware of the speed issues with their previous generation Extreme Pro USB stick and were told it was due to these two missing features (TRIM and UASP). What has SanDisk done about this problem? Absolutely nothing as their current generation Extreme Pro 3.1 USB stick is still missing these important features. I'm not sure if the above issues can be fixed with a firmware update for the Extreme Pro 3.1 USB stick. If a SanDisk support staff is reading my review, pass on my suggestion and see if TRIM support and UASP support can be added to the Extreme Pro 3.1 USB stick via a firmware update. Or if that is not possible, SanDisk should come up with their own proprietary software tool that can send a TRIM like command to the USB stick to completely erase blocks that are storing data for files that the user has already deleted from the USB stick.
All you need to do is have a read through the many 1 star reviews on the Amazon U.S. website and the Amazon(.de) website and you will see that this USB stick will not maintain it's super fast speeds in the weeks and months ahead. Speeds will be fantastic for the first 200GB to 300GB of data you transfer to it in total, but after that the performance of this USB stick begins to suffer because the USB stick does not have UASP and TRIM support.
I have now put in a return and full refund request with Amazon.
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SECOND UPDATE
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I have just ordered a Crucial MX500 500GB M.2 type SSD and a Adwits SATA M.2 SSD to USB stick enclosure case to build my own true solid state superfast USB stick (with SMART Data reading support and UASP/TRIM support). The Adwits USB stick enclosure case does not support TRIM with the default firmware. You will need to use the following tool ASM105xMPTool.exe (Google it) and use it to update the Adwits USB stick enclosure to firmware version 140509_A1_82_40.bin (Google it) and then TRIM will work via the USB Port. This is the Adwits USB stick enclosure case I have bought and it works perfectly with my Crucial MX500 SATA M.2 SSD: https://www.amazon.co.uk/Adwits-SuperSpeed-Cordless-External-Enclosure-SATA-M-2-SSD-USB-3-0-Case-Compact/dp/B0787FWVHP/ref=sr_1_1_sspa?ie=UTF8&qid=1550852681&sr=8-1-spons&keywords=adwits+usb+3.0+uasp&psc=1
MY ORIGINAL REVIEW IS BELOW (WHEN THE REPLACEMENT USB STICK WAS WORKING PERFECTLY)
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Not a True Solid State Drive and No SMART Data Reading Support
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The SanDisk Extreme Pro 3.1 USB stick is not a true solid state drive, but is a USB 3.1 flash drive stick that performs like a solid state drive. The company SanDisk only supports SMART data reading on their solid state drives, and since the SanDisk Extreme Pro 3.1 USB stick is not a true solid state drive, it does not support SMART data reading with softwares such as CrystalDiskInfo, HWiNFO64, etc. Even though the USB stick's previous firmware version 6EA 1010 use to report SMART data readings, these readings would not have been accurate as SMART data reading is not a supported feature on the SanDisk Extreme Pro 3.1 USB stick. If you try to read the USB stick's SMART data values with its latest firmware (version 6EB 1030), you will get incorrect SMART data values. The USB's temperature will be reported as 8°C and the USB stick's health status will be report as Bad 0%. No SMART data reading support is making people think their SanDisk Extreme Pro USB stick is dying, when in fact there is nothing wrong with their SanDisk Extreme Pro USB stick.
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Quality Control Issues
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The retractor switch on top of the USB stick to extend its USB connector after some usage would not click in place to stop the USB stick connector from retracting when the USB stick is plugged into a USB port. I eventually managed to fix this problem by pushing the retractor switch forward HARD and then retracting it at least 7 times and now when I use the retractor switch on top of the USB to extend its USB connector the USB connector is now staying extended like it should. So I have managed to fix that problem.
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Default Formatting by the Manufacturer
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By default, the SanDisk Extreme pro 3.1 128GB USB stick comes formatted as exFAT (which is a optimized file system for flash drives) with an allocation unit size of 512 Kilobytes (so if you transfer folders that contain lots of small files these small files will use up much more storage space on the USB stick). You can do a quick format on the USB stick and choose a much smaller exFAT allocation unit size (for example 16K) so that folders that contain lots of small files will take up much less storage space when transferred to the USB stick.
If you are a Windows operating system user the default exFAT file system means you will not be able to set user access permissions for the files and folders you store on the USB stick. You can easily fix this issue by reformatting the USB stick to NTFS, but I do not recommended you do this as NTFS will add extra wear and tear overhead due to its journaling file system and will shorten the lifespan of the SanDisk Extreme Pro 3.1 USB stick. The USB stick also has a 16 MB unallocated partition at the front of the drive.
Personally, I have put 2 separate partitions on the Extreme Pro USB stick. FAT32 (so that the USB stick works in my 4k TV) and exFAT (to use with my PC and laptop), and I used the software "DiskGenius" to do this.
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Positive Things About the SanDisk Extreme Pro 3.1 USB Stick
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POSITIVE POINT 1. The SanDisk Extreme Pro 3.1 USB stick comes with a 30 years warranty. If the USB stick develops a fault and is not functioning as it should, and troubleshooting the USB stick does not fix the problems you are experiencing with the USB stick, SanDisk will replace your SanDisk Extreme Pro 3.1 USB stick with a brand new one.
POSITIVE POINT 2. The USB stick maintains a high level of write performance after continual use (I have copied at least 150GB of data to the USB stick so far, and have done multiple quick formats, a complete data wipe, created a MBR partition table, and partitioned the USB stick a few times, and so far the USB stick has shown no signs of wear and tear as write speeds are still incredibly fast and consistent (176 to 180 MB/s without Windows cache, and 176 to 250 MB/s with Windows cache activated (exactly the same speeds when I first started using the USB stick). When Windows cache is disabled there is almost no fluctuations in write speed. Large files (.exe, .iso, .mkv, .mp4, .zip, .rar, etc.) transfer at a very consistent rate of 176 to 180 MB/s.
POSITIVE POINT 3. Another great thing about this USB stick is that it is using a MLC NAND chip and not a TLC NAND chip (SanDisk would not say whether the USB stick uses a 2D MLC NAND chip or 3D MLC NAND chip, and there is no way of verifying whether the Extreme Pro 3.1 USB stick is really using a MLC NAND as SanDisk has gone to great lengths to make sure that the type of NAND it uses is not reported in softwares such as "ChipGenius" and "USBDriveInfo". So you will just have to take SanDisk's word that the USB stick is using a MLC NAND chip. The write cycle endurance threshold for this USB stick could possibly be anywhere from 3000 to 10000).
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Negative Points
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NEGATIVE POINT 1. The USB stick has a slippery aluminium metal casing and because of this the USB stick can easily slip out of your hands (I have dropped the USB stick once due to this).
NEGATIVE POINT 2. SanDisk are to secretive about additional specs for this USB stick that are important for a customer to know. SanDisk support will not say what the max write cycle is for this USB stick or give an estimation of the max terabytes that can be written to the USB stick over its lifetime. Also, SanDisk support would not tell me what kind of MLC NAND chip the USB stick has. I asked them if it was using a 2D MLC NAND chip or a 3D MLC NAND chip, but they would not disclose this information. I wanted to know because then I would know what the approximate max write cycles are for this USB stick which is important if I am going to be storing my valuable data on it.
NEGATIVE POINT 3. Again SanDisk being far too secretive about the USB stick's additional specs. SanDisk support will not state what is the max terabytes that can be written to the drive over its lifetime and will not provide other important additional technical details (such as what is the Extreme Pro's Erase Sector size?).
NEGATIVE POINT 4. No "Looking After Your Solid State Flash Drive USB Stick" user guide is included in the packaging box. SanDisk should include a user's guide in the packaging box that provides tips on how to look after the USB stick. A user guide with a list of do's and don'ts such as to never do a full format on the USB stick and to never do a full drive encryption on the USB stick will stop individuals from doing things that have a severe negative impact on the USB stick's write performance and lifespan.
NEGATIVE POINT 5. The SanDisk Extreme Pro 3.1 USB stick has no UASP or TRIM support to help maintain the overall long-term speed performance of the USB stick. After you have written data to the USB stick that is 2 to 3 times it capacity (when all free blocks have been written to), expect the fast write speeds of the USB stick to drop considerably when copying large files (.exe, .iso, .mkv, .mp4, .zip, .rar, etc.). You can somewhat restore the USB stick's performance by using a software named "DiskGenius" to do a "Erase Free Space" on the USB stick, or you will need to do a "Secure Erase" on the USB stick using the SanDisk SSD Dashboard software (UPDATE: I do not think Secure Erase works on this USB stick. The "Secure Erase" procedure completes, but my files are still showing on the USB stick when I view it's HEX code). If you can manage to get "Secure Erase" to work, then it will restore the USB stick to peak performance. Also, if you use SanDisk's RescuePro Deluxe software to permanently "Wipe Media" from the USB stick, you will need to use the software "Rufus" to create a MBR partition table (in the software Rufus select the "NON-BOOTABLE" partition scheme) and to do a "quick format", otherwise you will experience problems when trying to add a partition at the front of the Extreme Pro flash drive.
NEGATIVE POINT 6. No SMART data reading support, which leads people to think their SanDisk Extreme Pro 3.1 USB stick is dying when they view its SMART data stats with softwares such as CrystalDiskInfo, HWiNFO64, etc., when in fact there is nothing wrong with their SanDisk Extreme Pro USB stick. Future SanDisk high-end USB sticks such as the Extreme Pro need to support smart data reading. As doing so will cut down on the number of people returning their USB stick for a refund or submitting it for a RMA with SanDisk due to them thinking the USB stick is faulty.
NEGATIVE POINT 7. HEAT issues under certain use cases. For example, if I plug the USB stick in the back of my PS4 Pro for 10 minutes (the PS4 Pro is switched on and in use), when I remove the USB stick it is not warm, but very hot. This could be due to the fact the PS4 Pro disperses heat at the back of the console. Once I removed the USB stick from the back of my PS4 Pro, it cooled down within a few minutes. Using the Extreme Pro USB stick in my PC to copy gigabytes of files to it only results in the USB getting warm, not hot, but that can be because the back of my PC (where the USB stick is) has a PSU fan that is dispersing cool air.
Images in this review
Das Auge
Erst hui, dann pfui
Reviewed in Germany on February 2, 2019Size: 128GBStyle: Flash DriveVerified Purchase
Mario Pacchiarotti
Impressioni d'uso e risultati dei miei test, alcune cose che dovreste sapere prima di comprare una USB di questa portata
Reviewed in Italy on November 23, 2017Size: 128GBStyle: Flash DriveVerified Purchase
Impressioni d'uso e risultati dei miei test, alcune cose che dovreste sapere prima di comprare una USB di questa portata
Reviewed in Italy on November 23, 2017
Breve ma doverosa premessa. Non sono un utilizzatore normale di chiavette USB. Ne uso moltissime, per motivi diversi e mi occorrono strumenti con caratteristiche diverse. Posso dire di aver più o meno testato una bella fetta di ciò che nel tempo è uscito sul mercato. Questa particolare chiavetta l'ho comprata per utilizzarla come backup per i miei dati di lavoro e ufficio. Una caratteristica mandatoria era che non mi facesse quindi perdere molto tempo durante i backup, che svolgo ogni pomeriggio prima di uscire dal lavoro e ogni sera prima di andare a letto (quando uso il pc a casa). Dovendo fare il backup di numerosissimi file, per lo più di dimensioni piccole (da pochi bytes a qualche mega), i dati di performance che di solito dichiarano i costruttori hanno poco senso. A me interessa prevalentemente il dato di scrittura di blocchi da 4K, quello che determina la differenza tra un backup di un'ora e quello di un minuto. Passiamo alla recensione.Reviewed in Italy on November 23, 2017
<b>Aspetti estetici e materiali</b>
La chiavetta arriva in una confezione tradizionale di cartone e plastica, con i soliti dati che potete trovare anche online su velocità e caratteristiche del prodotto. Si tratta di una chiavetta che ricorda i vecchi prodotti, per le dimensioni piuttosto generose. Il meccanismo è a slitta, dunque non ci sono tappini da perdere. C'è da sperare che il blocco che entra in azione non faccia la solita fine, allentandosi e rendendo quindi l'uso disagevole, specialmente inserimento. Per ora nessun problema, ma sono passati pochi giorni.
Il corpo centrale è in plastica, protetto da una specie di guscio esterno in metallo, tranne per la slitta che è libera di andare avanti e indietro per far uscire il connettore USB. Devo dire che la sensazione di robustezza è molto piacevole e non si corre il rischio di perderla facilmente, cosa che invece può accadere con prodotti molto piccoli. Il "buco" per l'inserimento della chiavetta in un ring o per agganciare un laccetto è in metallo, un pezzo unico con il guscio, ed ha dimensioni generose, si può tranquillamente inserirla in un portachiavi.
<b>Prestazioni</b>
Come ho accennato già, ero particolarmente interessato alle prestazioni in una casistica particolare: la scrittura di un gran numero di file di piccole dimensioni. Spesso questo valore non viene molto pubblicizzato, per una valida ragione: sono pochissime le chiavi USB che hanno performance decenti in questo campo, molte sono lentissime, anche se hanno invece ottimi risultati quando lavorano con file molto grandi.
La chiavetta arriva formattata con eFAT e un blocksize molto grande: 512K. Per chi non fosse avvezzo a questi termini, semplificherò spiegando che il blocksize è lo spazio minimo che viene occupato da un file singolo, anche di lunghezza zero. Una formattazione di questo tipo, per il tipo di uso che ne dovevo fare io, ha un piccolissimo difetto: rende l'occupazione di spazio della chiavetta disastrosa. Per capire l'ordine di grandezza considerate che migrando i file presenti nel mio disco di backup, circa 51GB di spazio occupato in quel caso, la chiavetta Extreme Pro da 128GB veniva occupata per 95GB. Non era un risultato accettabile, quindi dopo aver eseguito dei test di performance ho riformattato cambiando il blocksize a soli 8K. Dopo questo trattamento l'occupazione di spazio degli stessi identici file è passata a 54GB. Se anche voi pensate di utilizzare la chiavetta per memorizzare molti file considerate dunque la riformattazione preventiva.
Nelle foto allegate ci sono vari test da me eseguiti. Con USB2, con USB3, prima e dopo la formattazione (non ci sono grandissime differenze). Sono tuti fatti con la chiavetta già crittografata con Bitlocker. Come prevedibile la velocità di lettura e scrittura sequenziale crolla usando la USB2, ma per me la buona notizia è che in tutte le casistiche ho delle velocità di scrittura dei blocchi da 4k che vanno tra un minimo di 11 a un massimo di 13MB/s. Non pensiate sia un risultato da poco, c'è solo un prodotto sul mercato che fa di meglio, ma al momento non riesco a reperirlo, mentre la chiavetta che segue in classifica questa realizza risultati da 2 a 3MB/s, quindi 3-4 volte inferiori. Nella realtà, confrontando i tempi di backup sul campo dei miei oltre 85 mila file, sono appunto passato da circa 5 ore a un'ora scarsa. Nei backup parziali, dove prima dovevo attendere lunghi minuti, ora sono su qualche manciata di secondi. Prodotto quindi che mi ha risolto un non piccolo problema.
<b>Conclusioni</b>
Il costo di questo prodotto è piuttosto elevato, se confrontato con chiavette della stessa capienza con performance in lettura e scrittura sequenziale simili a quelle raggiunte dall'Extreme Pro. Tuttavia, quando parliamo di scrittura di piccoli file, le cose cambiano drasticamente, evidenziando un prodotto che ha una velocità da 3 a 4 volte superiore ai concorrenti migliori. Il mio consiglio è di valutare il tipo di utilizzo che ne farete. Se vi serve una chiavetta dove memorizzare film, video, grossi file, questa andrà bene, ma avrà un costo superiore a prodotti simili che potrebbero soddisfarvi lo stesso. Ma se avete intenzione di utilizzarla per il backup di computer, di librerie di foto o altri piccoli file, se i tempi con cui queste operazioni vengono portate a termine con altri prodotti non vi soddisfano, allora questo prodotto potrebbe essere un ottimo acquisto.
L'alternativa, la [[ASIN:B00FSAHJ24 Mushkin MKNUFDVU240GB Ventura Ultra U3 Memoria USB portatile]] non è al momento facilmente reperibile, ma se tornasse disponibile potrebbe essere un altro prodotto da provare.
NB L'esemplare che ho comprato, ha un problema con i programmi che evidenziano idati SMART. La durata residua di vita del disco USB viene registrata come zero, come se il disco fosse già "rotto". In realtà credo si tratti di un bug del firmware della chiavetta, perché il prodotto funziona perfettamente. Ho inserito un paio di screen che evidenziano il fenomeno.
Images in this review
Paolo
velocità reali ma è morta subito anche la seconda
Reviewed in Italy on August 31, 2018Size: 128GBStyle: Flash DriveVerified Purchase
bnetz
Superschnell und robust
Reviewed in Germany on February 25, 2018Size: 128GBStyle: Flash DriveVerified Purchase
