I am related to computer refurbishment charity company. We get also old stuff from other company's and it is always in contract, that hard drives must be at lea

I am related to computer refurbishment charity company. We get also old stuff from other company's and it is always in contract, that hard drives must be at least destroyed mechanically. No rewriting or deleting. Mechanical only. We remove platters, break them. After that, the value of data is far less for these things than the cost of recovering.