Simple past tense and past participle of degauss.(verb)
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Use "degaussed" in a sentence
"On the occasions where this process fails and there is a risk that data remains on the hard drive, it is removed from the machine and "degaussed" using electromagnetics, before being physically crushed and sent to a shredding machine that cuts the drives down to pieces of less than 25mm squared."
"The bad news is they were part of a batch of 200,000 tapes that were degaussed."
"Have any of you rabbits ever degaussed a cassett, not much left of the original is there?"