"file system formatter failed" (GTech and Yosemite)
i have a reasonably new (like three years old) 3 TB G Tech drive that i have been using for a Time Machine backup of my 2006 mac pro. as i upgrade to a 2012 i seem to be running into a lot of problems - including the issue that i am getting this error when i try and re-format this drive. i am reformatting since it says it is unreadable by my new machine when i plug it in. i also seem to have gotten some prompt at one point about GUID something or other.
i am finding some answers via a search on this that appear to recommend checking some setting or other when formatting but i can't find these settings in yosemite in disk utility so it is hard to tell what i should be doing.
any suggestions on what to do with this drive?
Mac Pro, OS X Yosemite (10.10.1)