Interested how a SATAII compared with a new SATAIII drive, I decided to do a quick benchmark to compare the results.
In this benchmark I will be comparing the Kingston HyperX 120GB SSD (S-ATA III), Seagate ST3320613AS 320GB 7200-rpm 16mb cache (S-ATA II) and a Western Digital Blue 2TB 5400-rpm 64mb cache (S-ATA III).
I am primarily doing this to compare the transfer rates of a faster, low cache S-ATA II mechanical drive with a slower, high cache S-ATA III mechanical drive. The reason, I hear you ask?
S-ATA III bus speed is rated at 6gbs compared with 3gb/s on the older S-ATA II interface.
A mechanical drive will never use up the whole bus width of S-ATA because of the way they operate, (all down to spindle speed and head speed) so my theory is that the faster the drive, the better I/O you will ultimately receive thus faster write and read speeds.
Looking at the results, I was quite surprised. To see a slower speed drive out perform a faster drive was not what I expected to see. As you can see, the HDD’s do not even fill half the bandwidth of S-ATA II bus speed, whilst the SSD is 100mb/s shy of hitting the top end S-ATA III speeds.
There could be a number of factors at play here; looking more closely at the Seagate’s spec sheets, it has endured alot of uptime and probably more spin-up’s then the WD will ever have. Also the test isn’t quite as scientific as having 2 “identical” drives with varying speeds and that’s probably where you will see results.
On the back of this, I’m quite impressed to have had the Seagate lasting this long; the internet is littered with bad omens of Seagate’s from years of old! It might be time to replace this one whilst I’m still winning!