Factory reset halfway through filevault decryption? I am selling my MacBook Pro and was reading through what to do before factory resetting the Mac. One of the recommended steps was turning off FileVault, but now I want to reset the hard drive and reinstall the OS and I'm stuck waiting for FileVault to do it's thing. I'm not sure how long FileVault will take but I don't want to keep the purchaser waiting and he's coming by in about 18 hours. 

Can I erase the drive halfway through the FileVault decryption process without it causing problems for the Mac? I'd imagine that if I'm erasing the drive the FileVault status won't matter too much but I'd like to be certain.
The secure way to do it is to simply erase the dive, don't decrypt it first. That makes recovery of your data impossible - whereas if you decrypt it, there is a possibility it can be read later by a bad actor.

See Apple KB - What to do before you sell or give away your Mac