We use an WD 5000BMVV, formated under Vista, with one partition, without encryption.
Last week we plug the HD, but Windows show us only one CD Rom UDF, and not the HD partition !
This virtual CDROM contains encryptions tools, that ask a password to unlock the drive.
The partition tools show an unpartitioned space of 500 Go
This probleme looks like this one, but nothing could solve it : http://community.wdc.com/t5/My-Passport-for-PC/WD-SmartWare-Drive-Unlock/m-p/45698/highlight/true#M2005
Thanks for the community’s help