How to securely wipe several disks drives
There are several reasons why disk drive might need to be erased securely. Some are:
- The disks are about to be disposed.
- The disks are being transferred to a new owner.
Technically, there are two ways to securely wipe a disk:
- Write a known bit (usually zero) to every cell of the disk.
- Write random values to every cell of the disk.
Method 1 guarantees that the disk is truly and fully erased but makes it obvious that the disk was erased when examined. This might not be desirable in a situation where there is need for plausible deniability that the disk was not erased.
Method 2 allows for plausible deniability that the disk was not erased, but there is a negligible chance that some data might still be on the disk. Multiple erase passes are usually performed to mitigate that problem but that only makes the random value erasure method more expensive/time consuming than method 1.
Intulon DFP7 USB 3 duplicator uses method 1 (writing zeros to all cells in the disk) to securely erase target drives. The duplicator has the advantage that it can erase 7 disk drives of mixed types and sizes simultaneously. Note however, that the operation will not complete until the slowest or largest disk in the set has been fully wiped.
On the DFP7 USB duplicator, the secure wipe function is accessible via the FORMAT button. Connect all the disks to be wiped, press FORMAT followed by the DRIVE CHECK button.