Two weeks after announcing its 3TB My Book Essential external storage drive, Western Digital has launched the first bootable 3TB desktop HDD. The notes, the rules are slightly different in a non-boot scenario. The average PC user doesn't need a 3TB boot volume anyway and would be better served by something smaller and quicker. Western Digital has priced the 3TB WD30EZRSDTL at $239 (HBA card included), while a 2.5TB iteration (WD25EZRSDTL) is $189.