Problem with WD passport 1TB drive not mounting on OS 10.5.6. Leopard macbook

I bought a new WD passport 1TB external hard drive and formatted it to FAT 32. It was working fine on my macbook (running OS 10.5.6 Leopard) & i have loaded it with files & also been using it on a windows PC with no problems.
I partitioned my macbook hard drive with bootcamp (the WD drive was plugged into the macbook at the time) and now it will not mount. I unpartitioned the macbook hard drive and restarted. I checked in disk utility and it appears there - I eventually got the option to repair the disk and I tried repairing and verifying the disk. No errors are showing up but it still doesn't mount. I now do not have the option to repair or verify the disk anymore, but its still visible.
It is still working perfectly on the windows PC but I want it primarily for use with my macbook. Is there any way to force mount the drive (the mount button is greyed out in disk utility)

No, the disk set is machine specific.

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Problem with WD passport 1TB drive not mounting on OS 10.5.6. Leopard macbook

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