Apple Time Machine doesn't see my WD My Passport 2 TB using USB 3.0 I have Yosemite 10.10.2 on my Early 2008 24".  Time Machine has been backing up to my WD external hard drives for years.  I just purchased a new 2TB My Passport using USB 3.0.  It's formatted in Mac OS Extended (Journaled).  The device shows up on by desktop and it does store files that I drag into it.  However, Time Machine does not recognize it.

Any thoughts?  Is it Time Machine or the 3.0 USB?
The following command line, using tmutil, will force Time Machine to use your mounted disk as its destination. If the disk is mounted as /Volumes/MyBackupDisk, run:
sudo tmutil setdestination /Volumes/MyBackupDisk

P.S. tmutil is very useful, also for deleting backups and working over the &quot;operation not permitted&quot; error.