I have a seagate 4 tb back up external hard drive and i cant get time machine to find and drives to back up to.
Any sugestions ???
See Pondini's TM FAQs, for starters.
Open disk utility and see if the hard drive is seen by the computer. Also check the format it should be Mac OS X Extended (Journaled) if you then your need to erase the hard drive.
Retrieving data ...