DVD in external drive "disappeared"

I am actually asking this question for a friend of mine who owns an external hard drive and is trying to use a DVD that my friend inserted into the drive. The DVD appeared on the computer for a second, then disappeared. Not even Disk Utility acknowledges the DVD's presence in the drive.
The currently-running operating system is Mac OS X 10.9.5, and the iMac and external DVD drive are just a few years old. There is no internal drive on the iMac.

Leave everything plugged in and Shut the machine clear off from the back wait a couple of minutes and then restart from the on off button on the back and it should work from then on.  If you ever have this type of problem I have found that turning off from the ON/OFF button on the computer lets the computer restart  in what I feel is the correct method.
CHEERS
DON

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    It is also possible that the drive has had the invisible bit set, this has become surprisingly common (a bug report was filed some time ago, but it still hasn't been fixed). Take a look at my article describing the problem and giving a couple of solutions:
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    Francine
    Schwieder

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  • Why does my external drive disappear on restart and i have to keep unplugging and plugging it back in

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    You may try a SMC reset, maybe do it 2-3x.
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    Shut down the computer.
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    Press and hold the power button for 5 seconds.
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    Attach the computers power cable.
    Press the power button to turn on the computer.

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