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it may not have been caused by anything more than mac os - and/or seagate. google - the more more specific the better you'll do. include seagate HD model, any error messages in quotes, etc. i'd still try another mac - same exact conditions. Also, try without other peripherals (hub, devices -...

Don't reformat! I meant try it on a mac w/ an older MAC OS! like 10.3.9, 10.4.x or 10.5.6. 10.5.7 and my last Seagate "windoze-oriented" purchase didn't play well together. while the prob was caused by seagate, i suspect that 10.5.7 makes it more problematic (as mentioned in this thread). Maybe...

NO! Thankfully! did you try another computer - maybe w/ an older OS? different cables? Also try to repair with DiskWarrior?

I've since read elsewhere that: - TimeMachine may function as an alternate app to wipe the drive and then allow you to rewipe it normally in DiskUtility - This may be a Mac OS 10.5.7 issue not Seagate.

This did not work for me. After successfully creating 2 mac partitions, I received an error when I tried to erase/make it 1 drive again. What DID work was using a 3rd party app - Drive Genius - no complaints from it. After this, I was able to use Mac's Disk Utility to slice and dice and...