I had a 500gb WD external plugged into my rMBP while I was installing CS6 and suddenly the drive's desktop icon disappeared and reappeared as two partitions named "Mybook" and "EFI". I immediately ejected the drive and plugged it into my Desktop PC but unfortunately it got wiped clean and repartitioned for no apparent reason. The only WD software I had was WDQuickView for my WD NAS. I'm currently Disk Drilling my drive hoping to get everything back. Also I would like to know if it's possible to recover file/folder structures?