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I recently bought a new Seagate 500 GB internal hard disk drive for my desktop and installed Linux (Pear OS). It was working fine for few minutes and then suddenly it hanged. I tried to open directories and got this error message "Failed to execute child process input/output error while read on [path]". I then checked with Disk utility and it shows the same error. I observed my HDD LED on casing was not blinking at all (continuously ON). I rebooted and directly checked with Disk SMART test but found no error. IT was showing that disk was OK. Suddenly after few minutes same problem happened. Then I installed windows 8 on it. It was working fine and suddenly it was frozen. Task manager showed Disk activity 100%. I booted in safe mode and it was working fine. It doesn't show disk activity. I checked my hard drive with most of the tools and nobody showed any kind of error. I did not get what is the problem. Is my Hard drive faulty?

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Try another drive - if the problem persists, then it must be something else. If not, faulty drive –  Simon Sheehan Oct 17 '13 at 18:29
    
Are you sure you performed the right S.M.A.R.T. test and interpreted the results correctly? If it's not the hard drive, it could also be a faulty storage controller. Simon's suggestion would be a great way to diagnose the origin of the problem, if you have another drive. –  David Foerster Oct 17 '13 at 18:30
    
Right now I don't have another hard disk. Earlier I had one which belonged to my friend and it was working fine. I also checked it with command line seatools. It showed no errors detected. –  Heisenberg Oct 17 '13 at 18:39
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S.M.A.R.T. testing is somewhat limited. Which other tools did you try, i.e. Seagate's own diagnostics? How long did you wait for the disk activity to resolve when the light went "solid"? Frankly, the percentage of disk failures when new is much higher than you might think ( behardware.com/articles/843-6/components-returns-rates-5.html ), not to mention that some models have alarmingly high failure rates -- i.e. theregister.co.uk/2009/01/16/barracuda_failure_plague –  Debra Oct 17 '13 at 18:41
    
I know this is out of left field, how's your power supply doing? –  user3463 Oct 17 '13 at 18:48
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