Back in the day, before virtualized services was all “the cloud” as it is today, if you were re-provisioning storage hardware resources that might be used by another customer, you would “scrub” disks by writing from /dev/random and /dev/null to the disk. If you somehow kept that shit around and something “leaked”, that was a big boo boo and a violation of your service agreement and customer would sue the fuck out of you. But now you just contact support and they have a copy laying around. 🤷