External Hard Drive (Seagate) does not appear

I recently updated to the new Maverics 10.9.2 and now my external hard drive does not show up in finder, or on my desktop.  I have looked using disk utility and disk drill and nothing appears.  I was wondering how I could get the information back from the disk.  I have tried plugging this hard drive into other macs and it will not appear.  Someone please help, I have all of my documents and media on this hard drive, I cannot lose it.

Either the Connecting unit is broken or the disk itself.
You can try to open the hoousing usally with 4 screws and put another hdd in and see if that one will be recognised if this is the case Your disk is messed up .
You should not rely on single external hard drives really.

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