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[adm]

Don't use TS, but my understanding is that if you wake it up and are "interested" in what is on, you might wish to rewind it - so it has to have been recording it. Which means it has to write to storage.

My understanding (which may be flawed) is if you want to be able to rewind live at any abitary point then the timeshift setting must be to have the disk continually spinning. The other mode is having the disk go to sleep and timeshift only starts, and the disk wakes up, when you press pause. In this latter mode you can only go forward and then back again to where pause was pressed. In the former mode the background timeshift recording starts 5/10 seconds (configurable) after you change channels.