If you want a quick way to "destroy" a hard drive in front of a customer, hit the motor spindle really hard with a hammer, and it will buckle the discs inside. One quick blow of a hammer, and the customer can rest assured that those old drives aren't going to be read again. While it wouldn't be impossible to recover data off of those discs, I can't imagine anybody going to the trouble for some random business' files.
The benefit of doing this is: It's quick enough that if the customer is worried, they can watch you knock out a bunch of them. Not as messy as drilling (plus you don't have to pay for drill bits), so it can be done in the customer's location. The discs can still be sold on
ebay as whole, as they are not being drilled or cut.
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