if something disspears, it's usually a case of either: a string of random, or malicious code; or Bad HDD (bad sectors, health or fitness of the drive).
If it were me, and because I can, I would take the HDD out, put it in a PC and run some tests on drive. and also try to access it from windows.
i've taken out countless drives and not once needed anti-static stuff. though it probably is a good idea. i wouldnt try it unless you're confident you'll manage.
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