Quote from Bernard111:
Any of your HDs is a Seagate Barracuda 500 Gb 7200.11 - 32 mb cache?
Quote from acronym:
I realise your talking about computers, and likely a mechanical noise, but i sometimes hear what you describe (a very high pitch tone, very annoying) just from electricals, radios in particular-that are turned off, mind you.
Many would put it down to tinnitus, except it dissapears when the offending appliance is turned off at the wall.
Quote from bespoke:
This is a bad drive. I had a 500 gb one and the first time I ran it it emitted these really loud clicking noises. I read some reviews and found out a lot of people are having trouble with these drives (ie. dying after weeks or months). Returned it in a flash.