My seagate 1tb hard drive is showing in deive manager, but not under disk management or my computer

My external hard drive is showing in device manager, is also makes the beep noise and lights up when attached; it used to have a pop up window when i plugged it in asking whether I wanted to view the files, that no longer happens, it also isn't displayed under my computer or device management, I'm on windows 8 but the problem started on my windows 7, it does the same thing on other computers
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  1. There is no reason why a drive would be present in device manager (and presumably the BIOS) and not show up in disk management, unless it was somehow inaccessible. I believe you may have a soft-failure of the drive here, which is usually due to some kind of electromagnetic shock to the controller or damage like that. Ironically, hard drives rarely respond as though they are governed by the laws of logic, so shelve it for a few days and see if it responds better. Another thing you could try is to put it in the fridge for a few hours - sounds ridiculous but when people attempt to rescue data from hard drives this is often a good way to access data while you can.

    I can't guarantee success and in all likelihood you'll never be able to access the drive again. To check and make absolutely sure, you could try a different USB connection cable between the drive and the computer in case one of the data loops has been damaged, but its much less likely than a soft failure.
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