Results from a couple computers

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New member
Oct 20, 2020
The first is a home-built system with a 1TB hard drive and a 250GB SSD. The second is a Toshiba laptop with a slow 250GB hard drive and a 250GB SSD.

Driv Size  Drive Identity     Location:    0      25%     50%     75%     100
---- ----- ---------------------------- ------- ------- ------- ------- -------
 81  250GB WDC WDS250G2B0A-00SM50        267.5   269.6   271.7   273.1   273.4
 82  1.0TB ST31000524AS                   82.0   117.5   106.7    87.9    63.6

                  Benchmarked: Sunday, 2020-12-27 at 11:35

   NOTE: A faster SATA drive is attached to a slower SATA link. You may add
         the /ident command-line option to display and identify the drive.

Driv Size  Drive Identity     Location:    0      25%     50%     75%     100
---- ----- ---------------------------- ------- ------- ------- ------- -------
 81  250GB TOSHIBA MK2576GSX              72.1    65.6    59.2    49.4    35.6
 82  250GB CT250MX500SSD1                237.7   229.6   232.0   270.8   236.8

                  Benchmarked: Sunday, 2020-12-27 at 11:56
Hi, thanks for posting your results!

Your WDC drive is looking pretty good!

Interesting that Readspeed mentions the slower SATA link in the laptop, but the SSD speeds don't seem to be capped at any particular point. I'm guessing it must be SATA II in the laptop? But I don't know exactly what the limit on that would be.

A lot of drives seem to max out at around 543MB/s, so I'm guessing the practical limit for SATA III may be around there?

SATA II should hypothetically be about half that speed, so I guess about 272MB/s might be the practical limit?
Last edited:
SATA II = 300MB/sec, SATA III = 600MB/sec, but there is a certain amount of overhead involved, so maximum actual data speeds are about 90% of that, so subtract about 30MB/sec for SATA II and 60 MB/sec for SATA III.
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