záleží, co PŘESNĚ jsi měl za externí disk. Jsou dvoudiskové modely. Jsou jednodiskové modely, jsou modely s interním OS (ty bývají dvoudiskové a často mají ethernet port).

viz http://www.adcworks.com/2008/06/diy-how-to-rescue- data-from-your-western-digital-mybook/

a zejména:

This will NOT work on newer drives because of the on-board u12 chip. If the control board on newer My Books go bad, you have to match the REV number exactly (DCM, etc does not matter), but you must also swap the chip over to the replacement board because of encryption protocols nowadays. Not to mention that Western Digital is proprietary. Their data is placed in their format as it is being written to the drive. Best to stay away from WD altogether... this is a very common problem that they are aware of and REFUSE to fix.