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Samsung Electronics 840 Pro Series 2.5-Inch Solid State Drive, 256GB

4.8 out of 5 stars 2,392 customer reviews
| 306 answered questions

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Product Description

Capacity: 256 GB

Product Description

Designed for power users and the most demanding applications. the Samsung 840 PRO SSD provides unrivaled read, write and multi-tasking performance. Built for the real world, with no moving parts reducing the risk of damage from shock, while using the latest in security technology including AES 256-bit encryption. It’s ultra-efficient design means up to 50 minutes longer battery life compared to competitor SSD's and HDDs. From the world's #1 memory manufacturer, it's time to get the speeds you want and the performance you need.

From the Manufacturer

Designed for professionals and demanding applications, the SSD 840 PRO provides exceptional read, write, and multi-tasking performance. It's built for the real world, with no moving parts to reduce the risk of damage from shock, while using the latest in security technology including AES 256-bit encryption. Additionally, its ultra-efficient design means increased battery life. This version of the 840 PRO Series SSD has a capacity of 256 GB.

840 PRO Series SSD

Performs the most demanding computer tasks more quickly than typical hard disk drives and improves battery life in laptops. View larger.

840 PRO Series SSD840 PRO Series SSD840 PRO Series SSD
Exceptional Performance for Professionals

With Samsung's 840 PRO Series SSD, everyday tasks on your desktop or laptop PC become faster and more responsive, providing workstation-class performance for seamless video editing or the ultimate gaming experience.

The 840 PRO is capable of delivering quick sequential read and write speeds--up to 540MB/s and 520MB/s respectively--for ultra-fast file transfers. In addition, the SSD features exceptional random speeds with 100K IOPS (read) and 90K IOPS (write) for the fastest real-world performance*. And it provides superior write performance for non-compressible data like images, music, videos and .ZIP files.

Engineered for Reliability and Security

The 840 PRO Series SSD is made to provide consistent, excellent performance through its entire lifetime even under extremely heavy workloads. Like all Samsung SSDs, it is designed and built completely in-house at Samsung using the highest industry standards and advanced Samsung memory technology. And, as with other solid state drives, the 840 PRO has no moving parts, which means no hard-drive spin-ups, no noise, and superior data protection**.

The 840 PRO allows you to keep up with demanding workloads while safeguarding your data. Advanced AES 256-bit ATA full disk encryption provides worry-free data security. And the 4th generation Samsung MDX controller technology and firmware ensures long-term sustained performance under the most punishing conditions.

Thin, Lightweight Design and Low Battery Consumption

At only 7 millimeters thick and weighing just 2 ounces, the 840 PRO Series SSD has a sleek, lightweight design that can make your laptop lighter to carry.

And because it contains no moving parts and features an ultra-efficient design, it consumes little battery power, allowing you to enjoy up to 50 minutes more of laptop battery life than a standard hard disk drive (HDD) or other solid state drive (SSD)***. It also supports Device Sleep mode for Microsoft Windows 8 and Haswell chipsets, which helps reduce overall power consumption.

Magician Software for Easy Maintenance

Samsung's Magician software includes business-friendly features that make it easy for IT managers to monitor and maintain the health of the 840 PRO Series SSD, including Self-Monitoring, Analysis and Reporting Technology (SMART) Support.

Product and Warranty Information

This SSD has a usable capacity of 256 GB, offers 512 MB of Samsung DDR2 SDRAM cache memory, and has a SATA 6b/s interface that is compatible with SATA 3 Gb/s and SATA 1.5 Gb/s. It measures 7.00 by 69.85 by 100.00 millimeters (H x W x D) and weighs 62.5 grams.

The 840 PRO Series SSD is backed by a five-year warranty.

What's in the Box

840 PRO Series SSD, Samsung Smart Data Migration Software, Samsung SSD Magician software and manual CD, and quick user manual.

Samsung Logo
Samsung 840 PRO Series 256 GB SSD
At a Glance:
  • Enables you to boot up your computer in as little as 10 seconds
  • Energy efficient--improves battery life by up to 50 minutes***
  • Solid-state design provides greater shock protection for data; brushed metal case blocks dust and corrosion
  • Worry-free data security with AES 256-bit full-disk encryption
  • 4th-generation 3-Core Samsung MDX Controller ensures sustained performance under demanding conditions
  • Precision engineered using 100-percent Samsung genuine components
  • Backed by a five-year limited warranty
Samsung 840 PRO Series Solid State Drives
Capacity128 GB256 GB512 GB
Type of DriveSolid State Drive (SSD)
Form Factor2.5-inch (Reduced 7mm thickness for use with ultraportables and netbooks)
For Use WithDesktop and laptop PCs (including ultraportables and netbooks) and workstations
InterfaceSATA 6Gbits/s (backwards compatible with SATA 3Gbits/s and SATA 1.5Gbits/s)
Random Read Speeds*97K IOPS100K IOPS
Sequential Read/Write Speeds530 MB/s / 390 MB/s540 MB/s / 520 MB/s
Controller3-Core Samsung MDX Controller
Type of NAND Flash2xnm Samsung Toggle DDR 2.0 NAND Flash Memory (400Mbps)
Type of Cache256MB Samsung LPDDR2 SDRAM512MB Samsung LPDDR2 SDRAM
Included SoftwareSamsung Magician 4.0, Samsung Smart Data Migration software
Dimensions0.28 by 2.75 by 3.94 in. (H x W x D)
Warranty5-Year Limited

*Real-world performance based on PC Mark 7 performance versus leading competition (http://www.anandtech.com/show/6328/samsung-ssd-840-pro-256gb-review/6)

** Incompressible data performance based on AS-SSD Sequential Write performance versus leading competition (http://www.anandtech.com/show/6328/samsung-ssd-840-pro-256gb-review/2)

*** Up to 50 minutes longer battery life versus standard HDDs and some competitor SSDs

Product Information

Capacity:256 GB

Technical Details

Collapse all
Summary : Screen Size, Screen Resolution, Graphics Coprocessor, Graphics Card RAM
Hard Drive 256 GB 256GB
Brand Name Samsung
Item model number MZ-7PD256BW
Hardware Platform PC, Mac, Unix, Linux
Item Weight 1.9 ounces
Product Dimensions 3.9 x 2.8 x 0.3 inches
Item Dimensions L x W x H 3.94 x 2.75 x 0.28 inches
Color Black metallic
Flash Memory Size 256
Hard Drive Interface Serial ATA-600, Serial ATA-300, Serial ATA-150

Additional Information

Customer Reviews
4.8 out of 5 stars 2,392 customer reviews

4.8 out of 5 stars
Best Sellers Rank #215 in Computers & Accessories > Data Storage > Internal Solid State Drives
Shipping Weight 4 ounces
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available October 9, 2012

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.
Product Warranty: For warranty information about this product, please click here


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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Size: 128 GB
The 128 GB version performs with remarkable speed and stability. After almost 2 weeks of very heavy use on a fresh install of Windows 7, I've experienced no issues. Samsung's 4th-generation 3-Core MDX Controller has been and still is at the top of the heap. Initially, the performance was lower than rated because I did not have AHCI mode enabled in my registry and BIOS, but after a couple of tweaks my benchmarks were impressive:

Samsung SSD Magician v3.2 benchmarks:
Seq Read 532
Seq Write 379
Ran Read 64378
Ran Write 43474

AS SSD Benchmarks:
Seq Read 502.25 MB/s, Write 370.08 MB/s
4K Read 29.13 MB/s, Write 53.99 MB/s
4K-64Thrd Read 327.99 MB/s, Write 270.136 MB/s
4K-64Thrd Read 83966 iops, Write 69153 iops
Acc.Time Read 0.083 ms, Write 0.060 ms
Score 981
(screenshot posted of 2 benchmarks taken a week apart)

This drive is a bit expensive (at the time of this review), but that is to be expected at this point. I purchased it elsewhere for a slightly better price and I did not hesitate buying it on the first day it was released. I also purchased a Silverstone SDP08 Bay Converter for it which fits nicely in my Asus case: SILVERSTONE SDP08 3.5 to 2 X 2.5-Inch Bay Converter. Regarding the software that comes included on the CD, Samsung SSD Magician always indicates there is an updated version when there actually isn't...strange, but the app works fine nonetheless. Their Data Migration software isn't included on the CD but is available for download from their website.
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Size: 256 GB Verified Purchase
I bought this drive after using the Samsung 830 SSD on my MacBook Pro. That drive was fast and super reliable, hopefully the streak will continue with this one. On typical day to day operations, I don't really notice a difference between the two. Benchmarks using Black Magic Speed Tests show the following:

Samsung 830 (256GB):

Read: 468 MB/sec
Write: 389 MB/sec

Samsung 840 Pro (256GB):

Read: 512 MB/sec
Write: 451 MB/sec

If you are thinking about upgrading from an existing SSD, depending on your usage, it may not be worth it. But if you are going from a traditional HDD, go for it. You won't regret it.
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Size: 256 GB Verified Purchase
===== Installation and Packaging =====

The packaging for this is minimal but seems efficient. I ordered from Amazon and they put the drive (which comes in a package the size of a CD case) in a larger box with some padding.

As far as installing the hardware into my desktop it was super easy. Mounted and plugged it in and it was good to go.

After double-checking to see my BIOS was set to AHCI mode for my SATA ports, I popped my Win 7 DVD in the drive and restarted my computer for installation.

Windows recognized the drive just fine and after making the few selections necessary it started to install.

This was the fastest installation of Windows I've ever encountered. I wasn't timing it directly but I'm pretty sure it was completely done in about 20 minutes. That's from initial "Start Installation" button click until the final reset where it boots up and you can actually start using windows.

After that, installing programs seems to be slightly faster but not that much faster than normal.

Copying files is waaaay faster. I copied over 20GB of files from my old Win install so that I could format the drive and replace them. It copied them over within a few minutes. Copying them back to my spinning-disk drive took a bit longer of course.

===== Expectations and Performance =====

I bought this to transfer Win 7 Pro and my games (mainly GW2, Diablo III, and other similar games) over to for better performance. So far it has been markedly faster but not as mind-bogglingly fast as I had built it up to potentially be.

As far as Win 7 Pro goes, I did a fresh install and after all the updates it now loads in probably less than 30 seconds.
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Size: 256 GB
***UPDATE 12/31/12***
Amazon keeps removing my links in this review, sorry. Also, I notice I had my read and write speeds flopped, this has since been corrected on all my reviews posted for each SSD.

I am an avid MacBook Pro user and do a lot of hardware reviews for Apple products. I was able to get my hands on a dozen or so SSDs and test them out on a 2011 13" MacBook Pro and a 2012 13" MacBook Pro and have posted my results below on speeds, firmware and RMA.

All test were done with the SSD installed in the Main HDD Bay1, not the Optical Bay with SATA III on both the 2011 and 2012 MacBook Pro's. All 3rd party SSDs in Mac's require a Terminal CMD or TrimEnabler App to enable TRIM has OS X doesn't turn this on be fault.


*WRITE: 306.3 MB/s
*READ 486.1 MB/s

SandForce SF-2200

Cannot be updated in OSX natively, you must use a Windows PC or with Bootcamp using the Windows Update Tool found at [...]
Offers Advance RMA? Yes.

Great SSD with good speeds, not faster than the Samsung 830, 840, 840 Pro or OCZ Vertex 4 but faster than the Crucial M4. SandForce based SSD which I've seen performance issues on OS X. As you see from the Benchmarks, all the non SandForce Controlled SSDs tend to performance slower on Mac's, minus the Crucial M4. Reliability seems to be reported good with these drives and users seem to be happy overall.

*WRITE: 265.4 MB/s
*READ: 501.
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