What is my laptop DOING?

I’m on my desktop atm, with the laptop just beside me. I haven’t touched it for a little while… it’s not doing anything, just sitting there on a blank, idle desktop with the screen off and the power plugged in. But for some reason, the hard drive randomly just starts working. Like, the HD activity indicator flashes and the thing sounds like it’s copying a 500gb file… It was going for a few minutes, then it died down, but its still intermittently working.

Kinda wierd :ko:

Is there something I don’t know?