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Recently, sometimes when I turn on my PC I see "Read Error" on a blank screen. Nothing else.

Why this is happening? I have been hearing some knock knock sounds from my new HDD.

Is there any software or any procedure to check the health of my HDD. I ran through check of windows 7 but found nothing suspicious.

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What OS, what HDD manufacturer, where did you get the HDD from? –  Mokubai Jun 19 '11 at 13:51
    
OS : Windows 7, HDD : Hitachi HDS721050CLA362 (500 GB), got from a big local shop. It was wrapped correctly. –  iamcreasy Jun 19 '11 at 13:54
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up vote 2 down vote accepted

"Knock knock" noises usually denote some kind of head positioning problem.

Hitachi have a tool called the Drive Fitness Test tool that you can download and run to find out if the drive has problems.

Get it at http://www.hitachigst.com/support/downloads/#DFT

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Is it ok to assume, when there some sort of knock knock, there is a problem with HDD? –  iamcreasy Jun 19 '11 at 14:04
    
For the large part weird knocks and clunks and clicks are the domain of the spinning devices (DVD & HDDs...), fans tend to make strange noise like a coffee grinder going slow, though hard drives can make a similar noise if the bearing goes... There not a lot else that actually makes knocking and clunking noises in a computer in my experience. –  Mokubai Jun 19 '11 at 17:30
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