I work for my university's helpdesk and a lot of students learn this the hard way every day. We always require users to assume full risk of data loss whenever t

I work for my university's helpdesk and a lot of students learn this the hard way every day. We always require users to assume full risk of data loss whenever they check in for a repair. For most computers, if they aren't okay with that, we can just tell them to go to a third party shop and have the drive pulled out and imaged first. For recent Macs we basically just have to tell them it's gone for good if we can't get the machine booting without having to swap the system board.