Hard drive not recognized after lion upgrade

My hard drive WD "My Book Studio Edition 1TB" mounts and unmounts non stop. Firewire or UBS is the same. Also with a new firmware of the disk and after a formatting. The file system is HFS+ journaled. My hardware is an iMac early 2009 24". No problems with all the other OS.
What's happen with Lion, Apple?

Hey Yelghoul,
     Make sure that the drive does not have the WD encryption stuff on it. That causes the Mac to render the drive unreadable and useless. Use another computer to remove the software and any passwords on it. Then plug the drive back in. If there are no files on it, simply open "Disk Utility" under "Utilities" to reformat the drive to make it usable with Lion or other computers.
Best of luck,
@youyouxue
Lion Developer

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