How to read the answer
NIST SP 800-88 Rev. 2 organizes sanitization into clear, purge, and destroy — and the right choice depends on both the media type and where the asset goes next. Media leaving your control (resale, donation, lease return, repair) warrants purge-level sanitization at minimum, with verification and a record (the full standard, including what Rev. 2 changed, is walked through in NIST 800-88, explained); media at end of life is usually simplest and cheapest to destroy. Whether that destruction happens witnessed at your dock or under seal at the facility is its own decision: on-site vs. off-site, compared. Whatever the method, every sanitization event should be verified and recorded with the device's make, model, serial, method, tool, operator, and date — that record is what turns a wiped drive into audit evidence.
This picker covers the decision; the field guide's 800-88 section covers the why, and the Vault's SOP template turns the answers into your written procedure.