For burst speed, the SATA drive is very fast. A burst of data gets
held in the hard drive cache chip, and then the transfer can be
every bit as fast as the cabling will allow.
For sustained transfers, ones which are larger than the cache RAM on
the hard drive controller board, the SATA drive is "more ordinary".
And then, it's only worth 5.9.
When you purchase a SATA III SSD drive, they can sustain transfer
rates as fast as >500MB/sec. Which could very well lift your
storage result. The very best rotating drive, can only sustain 180MB/sec.
My SATA drives, run around 125 to 135MB/sec sustained. Microsoft
can't "award a 7" to such a slow mechanical drive. The seek time
of a SATA SSD is also quite low, measured in microseconds. Whereas
it takes milliseconds to move the heads around on an ordinary HDD.
Example. 120GB SSD drive for $130. Use your motherboard SATA III port.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820239045
Specs. Drive specs are a function of storage capacity on some drives,
with the lower storage capacity drives being a bit slower. That is
not a problem in this case.
http://www.kingston.com/datasheets/sh103s3_us.pdf
Sequential reads SATA Rev. 3.0 120GB - 555MB/s
Sequential writes SATA Rev. 3.0 120GB – 510MB/s
Being Sandforce, that one uses compression internally to get
its speed. Wear life is 96TB. (Write 1GB of new data to it
once a day, for the next 96000 days. Write 100GB of new data to
it a day, for the next three years before wearout.) By
comparison, regular hard drives don't have a wear life,
and can be written continuously (until the motor bearings wear out
or dirt claims the heads and so on).
*******
On a more important note, is the computer fast to use ?
If it feels fast, and does everything you need, what more do you want ?
Benchmarks aren't everything.
Paul