Since I have 4x 320GB 7200.10 I tough I'd hook them all and see if these is a variation in the noise output
1. I tested the drive in a near SILENT room
2. The power supply I used was fanless and totally silent
3. Drive were place on foam pad to minimise vibration/resonance
4. Sound instrument : my ******* ear, from about 0.5m away. BTW I can hear that annoying "Mosquito" ring tone for Mobile phones, so my hearing is quite reasonable.
5. No drive seeks were involved as the drives were NOT connected to a computer
Drive 1
Date Code : 6522
Firmware : 3.AAC
Site Code : WU
Product of China
Result : near silent
Drive 2
Date Code : 6522
Firmware : 3.AAC
Site Code : WU
Product of China
Result : very slight high pitch whine
Drive 3
Date Code : 6527
Firmware : 3.AAC
Site Code : AMK
Product of Singapore
Result : near silent
Drive 4
Date Code : 6527
Firmware : 3.AAC
Site Code : AMK
Product of Singapore
Result : near silent
I wanted to investigate what could be causing one of the drive to be different, could it be just normal manufacturing variations or was it something else.
Upon close inspection I noticed one of the drives had a different "Drive Spindle Motor" and I bet you can guess which one it was.
Silent Motor
Not Silent Motor