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My PC can't read external sata hdd which i took off the old lap-top. I bought case for sata hdd which work on USB 2.0 . At my other PC and friends PC it worked ok, because he have and windows and ubuntu, and I tried to format it for ext4, and now I cant see on any other PC, except friends. How can i repair it or do something with him?

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closed as too localized by Eric Carvalho, belacqua, Thomas W., Alvar, Basharat Sialvi Jun 21 '13 at 17:31

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Does your BIOS recognize it? That's usually what it takes for Linux, or any other OS, to use it. –  Marty Fried Jun 15 '12 at 0:21
no.. i tried throught bios and terminal. –  Alexandar Koncar Jun 15 '12 at 0:25
If your BIOS doesn't see it, then that is where you should concentrate your efforts, as nothing else will see it either. It is not an OS problem, it is a hardware issue. Look in the BIOS to see if there is a setting, or look at the instructions for the sata enclosure to see if you have it connected correctly. –  Marty Fried Jun 15 '12 at 0:38
@MartyFried, that's not really true. Many older machines have no bios support for usb disks so won't see it, but the OS obviously can. You want to check if it shows up in the disk utility at all. –  psusi Jun 15 '12 at 1:44
If you want it to work on any computer, you'll probably need to format it as VFAT instead of ext4. If it's not working on your PC though, it could be due to the USB port not supplying enough power to the drive for power. All USB ports are not created equal. If you have an external power adapter for the external enclosure, plug it in and see if the drive shows up when you turn it on. –  dobey Jun 15 '12 at 13:50