Average Bench: 48.4% (379th of 995)

Based on 4,071 user benchmarks.  Models: ST95005620AS, Seagate ST95005620AS, ST950056 ST95005620AS, ST950056 20AS

The Momentus XT is a 7200 rpm low power Laptop SSHD (Solid State Hard Drive). The XT is one of the early SSHD models and at nearly four years of age it's now over the hill and struggles to keep up with newer drives. With peak sequential speeds in the region of 100 MB/s the Momentus is approximately 70% slower than the current group leaders. Most SSHDs offer relatively good small file 4K read and write performance but that isn't the case for the Momentus XT which only averages 0.6 MB/s in the random 4K tests. There are far better alternatives currently available for the same money. [Jan '14 HDrivePro]


Below average average bench

The Seagate Momentus XT SSHD 2.5" 500GB averaged 51.5% lower than the peak scores attained by the group leaders. This isn't a great result which indicates that there are much faster alternatives on the comparison list.


Avg. 4K Random Mixed IO Speed 0.27MB/s
Avg. 4K Random Read Speed 0.55MB/s

Good consistency

The range of scores (95th - 5th percentile) for the Seagate Momentus XT SSHD 2.5" 500GB is 23.5%. This is a relatively narrow range which indicates that the Seagate Momentus XT SSHD 2.5" 500GB performs reasonably consistently under varying real world conditions.


Avg. 4K Random Write Speed 0.94MB/s
Avg. Sequential Write Speed 83.7MB/s

Average Bench

(Based on 4,071 samples)
Min Avg Max
59.6 Read 85.1 104
57.8 Write 83.7 103
48.7 Mixed 77 99
61.6% 81.9 MB/s
Min Avg Max
0.25 4K Read 0.55 0.76
0.57 4K Write 0.94 1.31
0.16 4K Mixed 0.27 0.35
70.3% 0.59 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest HDD (mainstream) averages a speed of 100%
401GB free
Firmware: SD28 Max speed: SATA 2.0 300 MB/s
Read 98.2
Write 98.6
Mixed 93.7
73% 96.8 MB/s
4K Read 0.7
4K Write 1.09
4K Mixed 0.31
84% 0.7 MB/s
380GB free
Firmware: SD28 Max speed: SATA 2.0 300 MB/s
Read 93.7
Write 93
Mixed 88.9
69% 91.9 MB/s
4K Read 0.46
4K Write 1.17
4K Mixed 0.28
72% 0.64 MB/s
112GB free
Firmware: SD26 Max speed: SATA 2.0 300 MB/s
Read 79.4
Write 72
Mixed 80.2
58% 77.2 MB/s
4K Read 0.51
4K Write 0.83
4K Mixed 0.29
69% 0.54 MB/s
4,071 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 8,300,895 HDDs tested.


Approx. $130 @ launch in May '10
EbayUS $4018 mins
AmazonUS $609 mins
NeweggUS $1415 months
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EDIT WITH CUSTOM PC BUILDER Value: 65% - Good Total price: $284

Popular Momentus XT SSHD 2.5" 500GB systems:

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Hard Drive Rankings (Price vs Performance) March 2018 HDD Rankings.

We calculate effective speed which measures performance for typical consumers. Effective speed is adjusted by current cost per GB to yield value for money. Our calculated values are checked against thousands of individual user ratings. The customizable table below combines these factors to bring you the definitive list of top HDDs. [HDrivePro]

Group Test Results

  • Best user rated - User sentiment trumps benchmarks for this comparison.
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  • Best value for money - Value for money is based on real world performance, price and capacity.


SSD Speed. HDD Capacity. A Price That Makes Sense....

Added 4 years ago.


14 months ago.


this is a very miss understood HDD (SSHD) , if your using your computer for day to day stuff this is nearly as good as a SSD, most users who access a laptop or even desktop most disk use is read and that is what this HDD is for, 8GB flash cache is Plenty to let the drive auto cache your most used part of the disk and the best thing its automatic no drivers needed as it works at the low level so you do not have to think about it the disk learns it self, I typically only use Seagate SSHD as you can get them for £52 New, other places New typically £60, can be from £30-£50 used (why push the price up on ebay to a price you can buy it for new is silly), Toshiba also do SSHD as well (who knew, random Seagate SSHD search randomly pop up as Toshiba SSHD result but they go for £60-70 so to much for me to use as a replacement HDD for customers)—Sep '14


4 years ago.


5 months ago.

Still going strong after 7 years, numerous transfers, and several different operating systems. Originally installed as an upgrade in a 2008 White MacBook, after which it was transferred to a Windows 7 desktop (it also ran Linux for a while), and eventually downgraded to storage. It has since been used for storage in two Windows 10 desktops, including my current build. It's a snail compared to the rest of my machine, but is still a reliable storage device for documents, graphics, music, and videos.

995 Drives (Compared) Thousands of user benchmarks compiled into one comparison list.

See how consistently different HDDs perform with varying real world conditions. The charts also illustrate overall performance, popularity and rank.

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