I just bought a 4TB external hard drive. Why? A 4TB Seagate Backup Plus was on sale for $100. First - should I just send it back? I don't think I'll EVER wrap my head around storing 4TB on a single drive, other than as a backup of backups? If it were to fail and it was the ONLY drive I had holding 4TB of data? Geezus... If the gurus think it's cool and I can actually TRUST a 4TB drive - then what formatting and/or partitioning should I use? If the drive fails, do all partitions fail - or how exactly does that work? Thanks for any info. I already have a dedicated Time Machine backup drive, but it's "only" 1TB. And I have run into a problem in the past with Mac OS "fussing" at me because the drive SHOULD (?) be 2TB for my 500GB SSD? So do I just create a 2TB partition just for Time Machine with this new drive and then reformat the old external drive for other purposes? Then possibly 2TB of ExFat for holding movies, audio, stuff like that? Thanks for any advice - particularly as to whether, if the drive fails, if all partitions fail? And whether I should use ExFat rather than HFS, given Apple is about to ditch HFS anyway?