The Seagate 1TB and 1,5TB are experiencing a great % of faulty HDDs.
Dubbed the Click of Death due to the clicking sound the drive starts to make a few day's before it dies/becomes useless.
Had this happen to me, fortunately managed to copy everything to a WD 1,5TB before the Seagate one died.
Note, the Toshiba 1,5TB Store ART external USB HDD is a Seagate 1,5TB.
Google "Seagate 1,5TB click of death" if you want more stories.
Edit: Mine started clicking after 8 day's of use.
Warning! Seagate 1TB & 1,5TB Click of Death
Moderators: NeilBlanchard, Ralf Hutter, sthayashi, Lawrence Lee, Devonavar