@jamieburchell. Thats what I meant. If power is turned off during a write operation, it could cause a bad write or an off track write, damaging data on the track or adjacent tracks.
When a hard drive is spinning and the heads are floating over the disks, the code goes through a planned sequence of events during power down. Consisting of unloading the heads and spinning down the heads. But in the case of power being cut off to the drive, the hardware on the drive, tries to retract the head back to its latch and spindown. But this process is ****e to errors and one could end up with a head sitting on the disk. This can cause a scratch on the disk, next time the drive powers up. This is disastrous because it damages the head totally.
@gunrunnerjohn, Transmission already provides the feature to stop BT downloads at specific times. I guess this is one more reason to install Transmission and fun_plug.
Thanks for all your replies.