Since it's been 6 days and no response from the technical support, I'll try luck here and see if there is someone else with a similar problem.

Since 07/28/10, I bought the HDD on 05/22/09, the disk started to make some weird  noises, some minutes after it's turn on.

It's a little like the sound it does when it's in use, but a lot more loud and annoying, besides this sounds only happen when I'm not using the HDD, they stop when I access data or run any defragmentation program, and when the noises occur, the HDD activity light is off.

Trying to determine the source of the problem I unplugged the data cable from the HDD leaving only the power connection, result: the same, after some minutes the noises start.

Another thing that could be relevant to this it's that the drive has never been with so little free space, almost 93% of the HDD was full, and the disk was 5% fragmented; by now I have freed some space and today the free space on the disk is up to 21%, and the fragmentation is of 2%.

Could it be a Firmware problem?
Is this disk likely to die at any time now?
Has anyone had a similar problem?

Thank you, for your time.

Hi...

I bought two WD Caviar Green 1TB (WD10EADS) HDDs in May 2010. They're used as backup drives. I seldom used them in the past three months. Recently, I heard the similar sound (when the HDDs did nothing) as described below.
You may find more complaints at the following links. Both of my WD Caviar Green 1TB HDDs were manufactured in Malaysia. I believe some of our friends in this forum work in the Western Digital at Petaling Jaya. Do you think both my WD Caviar Green are still OK and safe to be used as backup drive?

Caviar Green 1TB Very annoying noise
http://community.wdc.com/t5/Desktop/Caviar...oise/td-p/38873

WD Elements with permanent access noise in idle
http://community.wdc.com/t5/Other-External...-idle/td-p/1935