i Have 2 80 gig SATA versions and one is about 10-15% slower than the other.
The faster one is very fast (max read speed approaches 65MB/sec).
The slower one also has very poor seek times according to HDTach. Sometimes over 20 ms.
The faster one is more in line with my expectations of 13-14ms.
Until i found this thread i thought that the drive might be failing. Powermax cannot access either drive (i have an Asus A7N8X Deluxe and am using the onboard Sil3112 raid controller).
I originally bought the drives to run raid 0. The overall performance seemed pretty good with 16k stripe size, but seek times were very poor , around 18+ms.
After reading this thread i checked the serial #s on both drives and sure enough one is a 3 head (slower drive) and the other is a 2 head.
I feel a bit ripped off here. Since when do you buy two supposedly identical drives and find out the internals are different?
That is not even the biggest problem (hey i work in a supply environment and substitutions are normal) , the performance delta between the two drives is unacceptable.
I am going to try and RMA the slower 3 head drive and get a matching 2 head so i can get a properly configured raid array set up without having to cripple the fast drive by raiding with a slower drive. That was the whole point of me buying the (supposedly) same make and model of drive.
Me no happy!