Thumb drive no longer recognized.

I splurged and bought a 128 GB thumb drive and set up time machine.  Everything was fine - until I removed the drive.  Not the computer will not recognize the drive,  I tried disk utilities - nothing; The disk won't mount because the computer doesn't know it's there.  I tried many of the suggestions on this website. 
The only thing I can think of is that I removed the drive without hunting around to find where I need to eject the drive or that I installed the latest version of the operating system (Mavericks?).
I'm a new mac user and very discouraged right now.  Help!  I don't know if I even selected the right community.
Loveopera

Hi Travisstraub,
I put the drive into my only other computer, a Sony vaio with windows 7.  When I check the screen that lists devices and printers it finds the drive, and gives the message that it is working properly.  BUT it does not show up when I opern computer tab which shows the active drives/disks.
Loveopera

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