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One of the four internal harddrives (SATA) of my computer is causing me some trouble.

This drive only have one NTFS partition. Everytime I try to copy a file on it, the copy eventually fails after a few seconds, and the disk completely disappear from my OS (Win 7).

Even if I take a look at the Disk Management tool (in Computer Management window), the drive isn't there. The only way to make the drive reappear is to restart the computer.

I did an error check, and nothing came up. This drive worked fine in this configuration for at least a year before starting to do this.

Any idea on what could cause the problem, or on what I should be looking for?

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I would try disconnecting and then reconnecting it to the motherboard - it could just be a loose connection. – D. Strout Nov 24 '12 at 13:16
This sounds like your hdd is about to fail. Check the S.M.A.R.T data on the failing hdd. I have a similar problem and the drive is failing. – Ramhound Nov 24 '12 at 16:16
Sorry for taking so long to answer. I had a bunch of other problems with my computer to fix first. The SMART check didn't find anything. In the end, D. Strout was right: reconnecting the wires did the trick, even if everything seemed well connected. Thanks to both of you – Yosko Dec 12 '12 at 10:46

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