Hmm it’s very weird, the read on TYG03 is the same as on the TYG02 I tried earlier.
Yet if I read MMC-004-00, it goes up to 16x quite happily.
As I’m all out of ports on my ICH9R, I’ve had to put the drive on a Sil3512 card. It’s running the 4.3.84 bios and the 1.3.70 driver - which came from ‘Windows Update’ and is newer than the one on the Silicon Image website (1.3.68).
It’s not like the drive changes tone when reading, it’s always spinning at the same speed, it just isn’t dealing with enough I/O’s!
Mine isn’t the first drive I’ve seen to do this either. I hadn’t paid any attention to read speeds before I saw this other person’s graphs but had to double check my drive when I noticed how wrong his were. There’s obviously a compatibility issue somewhere but I’ve not taken the time to look into it.
FYI: My drive is using the official 1.18 firmware without any tweaks.