consider switching to btrfs which has subvolumes (think partitions as folders, no need to predefine their size) and you’ll never have to deal with this again. also compression and deduping (all those duplicate games dlls and whatnot take up space only once)
those are still connected via USB internally most of the times, type lsusb and if it’s there, same thing applies.
if your BT is connected via USB (lsusb), there’s a buncha kernel switches that prevent it from suspending. since it’s a stationary device that’s often not needed, so disabling USB and BT autosuspend goes a long way to make them things behave.
have the data drive (movies, backups, etc) get decrypted with a keyfile from the system SSD. you’re safe to lose, throw away, sell your data drive and don’t have to bother with shredding the data. this takes hours for drives of any significant size.