I recently tested my 2 HD's with HD Tach, and was VERY unpleased with the results. I honestly do not feel these are accurate results but numerous tests kept showing the same results.
My HD's are 1x30GB WD 7200RPM, the second a 1x80GB Hitachi 7200RPM. The reason I was testing the drives was because I just ordered an SATA Hitachi drive to replace one of the drives. I wasn't sure which, so I downloaded HD Tach to see which one was slower. Well both of them were in the 4mb/s range!
Here are the results for both the drives.
30GB WD HDD
80GB Hitachi HDD
My HD's are 1x30GB WD 7200RPM, the second a 1x80GB Hitachi 7200RPM. The reason I was testing the drives was because I just ordered an SATA Hitachi drive to replace one of the drives. I wasn't sure which, so I downloaded HD Tach to see which one was slower. Well both of them were in the 4mb/s range!
Here are the results for both the drives.
30GB WD HDD
80GB Hitachi HDD