Toshiba external drives won't show up at all on my computer (Summer 2010 MacBook Pro) since I updated it to Mavericks.

Ever since I updated my laptop to Mavericks, my toshiba drives each do a different thing when I plug them in. One of them, which is formatted for mac, works just fine. The second one, formatted for windows doesn't mount, but shows up in the disk utilities. It worked perfectly fine on Snow Leopard, and seems to work on any other computer running Mavericks. I bought a third drive to transfer all the contents and reformat the second drive for mac, but the third drive doesn't show up on my laptop or my home computer (iMac), which is running Snow Leopard.
Anybody have any ideas or solutions as to what's going on?

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i updated to maverick and now my toshiba hard drive won't work
whats the format on the external HD?
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