Yes, of course, the problem is that it is not easy (IMHO) because of the lack a clear division between data and OS. I mean, if you decide to encrypt the whole

Yes, of course, the problem is that it is not easy (IMHO) because of the lack a clear division between data and OS. I mean, if you decide to encrypt the whole disk (like bitlocker or similar) you will need to provide the password/key to the repair shop or they might not be able otherwise to test that it is fully functional, if you have all your data on a separate volume you may well encrypt that volume only, but lots of possibly "private" data is anyway scattered on the OS volume.