WD Essential 500GB USB External Drive Not Recognized

I have a WD USB External Drive which was formatted for use with my old windows based PC. Bought iMac G5 and at first recognized but now does not and when i run disk verify in dissk utility get following error message:
Verifying volume “My Book”
** /dev/disk1s1
** Phase 1 - Read FAT
** Phase 2 - Check Cluster Chains
** Phase 3 - Checking Directories
Unable to read directory (Input/output error)
Error: The underlying task reported failure on exit
1 non HFS volume checked
Volume needs repair
Get same message when I try to repair, any help will be greatly appreciated

Hello! I would try hooking it back up to a pc and run the repair function from there or erase the drive as Mac format and start all over. Tom

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