seems a lot of orgs work on cargo-cult knowledge

https://twitter.com/SwiftOnSecurity/status/56891586200393318... (2015)

https://twitter.com/SwiftOnSecurity/status/11917713453627965... (2019)

i think swift had another post about it a bit more recently but i cannot find it now

if you encrypt the disk at the os level, you only need to throw away the keys, ie: reformat the drive. no need to physically erase as what is store is just noise once the keys are gone.