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Plextor 256GB M5S Series Solid State Drive SATA 6.0 Gb-s PX-256M5S

4.3 out of 5 stars 30 customer reviews

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  • Made For Real-World Speed: Maximum speed performance during everyday operations - random read speed up to 73,000 IOPS and random write up to 70,000 IOPS.
  • Sustained like-new performance which eliminate the sharp drop in performance seen in many SSD devices after periods of real-world use. Exclusive firmware with outstanding Instant Restore feature
  • Exclusive technology designed to prevent drastic drops in read/write speeds that normally occur with SSDs after a prolonged use or when data become heavily fragmented
  • No loss of speed when working with non-compressible data such as common video, audio, or photo file types. Controller design ensures high stability and performance during multitasking.
  • Performance Specification (please insert the attached file "PX-M5S_datasheet_071012_spec_crop.pdf"
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Product Description

Size: 256GB

The M5S Series SSD continues to deliver the highest quality storage performance in the industry. Continuing with the legacy and award-winning performance of its predecessors, the M5S SSD is consistently faster and reliable. Featuring Plextor’s True Speed Technology, exclusive firmware, and server-grade controller chip, the M5S SSD is capable to deliver stable data transfer speeds over the long period. In actual every-day computing environment, it is able to achieve and sustain the like-new performance even after intense activity. The M5S SSD is engineered to delivers consistent performance. The M5S SSD clocks in random read/write speeds up to 73,000/70,000 IOPS with sequential read/write speeds up to 520/390 MB/s. Coupled with exclusive firmware and True Speed Technology, the reliable M5S SSD provides sustained high speed performance without slowing down while storing and transferring all types of data. Setting a new standard for SSDs, the M5S SSD is designed with a high random read/write speed and consistent performance when working with non-compressible data such as encoded video, MP3 audio, or JPG images. This makes it ideal for use in audio/video workstations as it can provide fast loading and saving times for large files and make the processing of editing far smoother and easier. Also, the M5S’s long-term sustainable high speed performance gives users the fast storage they need to boot, save, and load almost instantaneously.

Product Information


Technical Details

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Summary : Screen Size, Screen Resolution, Graphics Coprocessor, Graphics Card RAM
Hard Drive 256 GB
Brand Name Plextor
Item model number PX-256M5S
Hardware Platform PC, Mac, Unix
Item Weight 3.2 ounces
Product Dimensions 5.2 x 0.9 x 4.3 inches
Item Dimensions L x W x H 5.2 x 0.94 x 4.29 inches
Flash Memory Size 256

Additional Information

Customer Reviews
4.3 out of 5 stars 30 customer reviews

4.3 out of 5 stars
Best Sellers Rank #1,288 in Computers & Accessories > Data Storage > Internal Solid State Drives
Shipping Weight 3.2 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 July 12, 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: 128GB Verified Purchase
There is a huge difference in performance between run-of-the-mill mechanical drives and SSD technology. Plextor is a lesser know brand in the SSD world, possibly due to the cost per GB of their drives. However, their SSD failure rate can be compared with Intel and Samsung drives.

This Plextor M5S 128GB drive has the following advertised stats:

Size: 128GB
DRAM Cache: 256MB DDR3
Sequential Read (6Gb/s): 520 MB/s
Sequential Write (6Gb/s): 200 MB/s
Random Read: 71,000 IOPS
Random Write: 51,000 IOPS
MBTF: 1,500,000 hours
Dimensions: 69.85mm x 100mm x 9.5mm
Warranty: 3-year

Regretfully, the Plextor M5S will not fit into some ultra slim notebooks which require a 7.5mm drive. However, in my case this wasn't an issue and I was able to swap my old mechanical drive for this drive without any problems. This was my very first SSD so I was very curious about real world performance. There is a lot of information out there about SATA III (SATA 6.0Gb/s) performance benchmarks of various SSD manufacturers. I found that it wasn't the case for SATA II, which is what my laptop currently has.

I wanted to install Windows XP on this drive particularly because XP doesn't take up as much space as Windows 7 does. Windows XP does not have TRIM support, but according to my research, the firmware and the Marvell drive controller in the M5S do a great job with garbage collection so TRIM would not be absolutely necessary to keep this drive running at top speed. Before Win XP can be installed, this drive needed to be connected to another computer that already had an operating system installed to align the SSD with DiskPar (there is a great tutorial online for that if you google "align ssd diskpar").
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By Glen on October 6, 2012
Size: 256GB Verified Purchase
Simply Amazing! I thought my Seagate 7200RPM 2TB SATA 6GB/s was fast, but this little drive blows it out of the water. I went from a 5.4 to 7.9 on Windows 7 user experience. I did a fresh install of Win 7 x64 and it was a breeze. First, I disconnected my 3 existing hard drives, and connected SSD to SATA 66GB/s port, and instantly my mobo recogized PX-256M5S SSD. I enabled ACHI in BIOS, booted windows from a 4gb thumb drive, and windows loaded and configured itself on the new drive within 5 minutes. Once up in windows, ensure TRIM is set to "ON" as this to handle garbage collection overhead.

Once the drive was loaded, I reconnected my 3 mechnical hard drives and now I have 6TB for data storage and 256GB SSD for OS. Not only does windows boot much faster (12sec), everything else runs so much more smoother and responsive than before. Yes, it worth every penny!

Last thoughts, from what I read, the PX-256M5S is not advertized as the fastest drive on the market, as they focus on consistency in both read and write IOPS which means the Plextor SSD should have the same out of the box performance, for its entire lifespan, and regardless of how full it is.

Asus p8z68-m pro
16gb RAM
nvidia GTS-450

Plextor 256GB M5S Series Solid State Drive SATA 6.0 Gb-s PX-256M5S
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Size: 64GB
After my hd crashed, I decided to upgrade to a SSD drive, since the the prices are dropping
compared to a few years back, I decided to take the plunge, and will never be looking back to conventional HD's ! Boot up time is extremely fast, everytime windows boots up it feels like a fresh copy was just installed and not bogged out, launching applications (adobe photoshop, illustrator etc) opens up in seconds. Dont hesitate, purchase with confidence ! Also plextor is a great company all my optical drives are Plextors
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By Komix2k on October 25, 2012
Size: 128GB Verified Purchase
As fast as advertised when using the right SATA III controller; very light weight

Not alot of reviews due to Plextor being new to SSD's; No 2.5"-3.5" mounting bracket; No screws

Thoughts and edits:
I've had the unit since Monday 10/22/12. Installation was relatively simple despite the lack of screws or 2.5-3.5 bracket as my case has a built in ssd mount on the bottom. Easy to setup. Only giving the unit 3 stars because my drives read speed is well under the "up to 520mb/s" advertised on the box. The benchmarks ran (Crystal Disk Mark, Atto, and AS SSD) all show the drive reading at around 380mb/s-400mb/s. The writes on the other hand are pretty spot on. The back of the box says "up to 200mb/s". My tests show it's getting around 200+. I'll have to have the drive for longer so I can find out if the drive loses allot of performance over time or if it stays fairly consistent with the given speeds before I reccomend over another brand. If it stays consistent over time then I'll be happy with the drive.

I recently purchased a second SSD for my computer due to space and when I got that installed I realized there were 2 different colored groupings of SATA III on my motherboard after reading my manual I found out 2 ports are a AS media controlled SATA III connector and the other 2 are Intel controlled SATA III connectors. I had the SSD installed on the AS Media controller so I switched them to the Intel SATA III controller and after booting back up ran AS SSD (504.16mb/s;196.9mb/s), CrystalDiskMark (521.8mb/s;203.8mb/s), and ATTO (535.7mb/s;204.5mb/s) (read;write) benches again the reads jumped up to where they should have been averaging 520.6mb/s and writes averaging 201.7mb/s just above advertised.
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