i buy this My Book 2T some months ago and i only install OS X 10.9.2 and don’t use it until one week ago.
Booting is impossible so :
• i re-format and re-intall (with Disk Maker X) and it boot correctly (with 10.9.3) at the end of the install but after shutdown it won’t recognize the boot disk
• i re-do it once with the My Book and an other external disk (Seagate) in another enclosure (verbatim with usb3 too) and it boot fine from the Seagate but not from the WD so the problem is not how i do the installation but with what
• some time when i plug the usb 3 a noise come from disk at start
• i try reset pram with +alt+p+r five time
• i try reset SMC
• i try +s and fsck -yf (nothing anormal was found)
• i repair permissions and check the disk with diskutility
But i have again and again either the folder with question mark or the no entry symbol.
If someone has an idea …