Old hard drives: wipe, secure-erase or destroy

An old drive can hold far more than the files you see — deleted data may still be recoverable unless the drive has been overwritten, purged or destroyed. Deleting files and formatting quickly is not enough.

Pick the NIST level

• Clear — overwrite / logical techniques that protect against simple recovery. Suitable for an unencrypted spinning hard drive you can fully overwrite and verify.
• Purge — secure-erase / sanitize commands, or destroying encryption keys on an encrypted drive, intended to make recovery infeasible with laboratory techniques.
• Destroy — physical destruction of the media. The route for dead drives, drives that fail an erase, and highly sensitive unencrypted data.

By drive type

• Spinning HDD, unencrypted: full overwrite with a reputable tool, then verify the drive reads back as cleared — or destroy it.
• SSD: use the manufacturer’s secure-erase / sanitize command; simple overwriting behaves differently on flash media and may leave areas untouched.
• Encrypted drive: destroying the keys (crypto-erase / full reset on an encrypted volume) can purge it — only if encryption was on before your data was written.
• Dead / clicking drive: it cannot be wiped by software. If the data matters, recover first; if it does not, destroy the drive.

No method should be promised as making data “unrecoverable” without its conditions — encryption state, media type and whether the process completed all matter.

Then recycle the remains

Wiped drives and destroyed-drive remains go as e-waste to a S.A.F.E. Center or county event.

Wondering what professional recovery would cost before you decide? Data Recovery Cost Check gives a cost frame for that branch — get the data back first, then wipe or destroy the original.