My simpletech external hard drive shows up in disk utility on one macbook pro but not my other one.  how do i fix this???

I have two macbook pro computers.  My external HD was reformatted on one of them from a PC to MAC.  It shows up just fine on this macbook.  The other macbook, I cannot find it.  Ive tried in disk utility and Ive tried to see if it was hidden.  Cannot access it.  What can I do to make it show up?

Mac's with OS X 10.6.4 or earlier can't read exFAT, so if it was formatted with that (or OS X Extended J) ) and the other Mac is running 10.6.4 or earlier or is even older, it can't read the exFAT format or HFS+ format, perhaps only HFS.
You'll have to settlle for FAT32 (MSDOS) with a MBR Partiton map to be fully compatible with all computers, but you can't have over 4GB sized files with FAT32.
You can try OS X Extended, no journaled, just for the Mac's, but MBR with FAT32(MSDOS) would be preferred. PC and Mac of all types.
Before you change anything, remove all the data off the drive first.
https://discussions.apple.com/docs/DOC-3044
https://discussions.apple.com/community/notebooks/macbook_pro?view=documents

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