I recently had to ship some (used) drives back to the manufacturer. And even though I'm pretty sure the drives will be erased first thing and even though the drives were used in a RAID (actually SHR2) set with an encrypted volume and it would be hard, if not impossible, to recover anything from them without my help I'm still never too keen to keep my bits and bytes on drives that are out of my hands. Selling my laptop? Erase drive. Recycling an old workstation? Erase drive. Then use a hammer to whack a screwdriver through the drive or "drop" (rather: throw) the drive on the ground a few times. You never know where a drive ends up and in who's hands.
