Repair disk updating boot support partitions
If the partitioning scheme is not specified, then an appropriate one for the current machine is chosen. Times is the optional (defaults to 1) number of times to write random information. In either case, in order to be useful again, randomized wholedisks will need to be partitioned, or randomized partitions will need to be erased (newfs'd), e.g. If you desire a more sophisticated erase algorithm or if you need to erase only free space not in use for files, use the secure Erase verb.
Erase, using a secure method, either a whole-disk (including any and all partitions), or, only the free space (not in use for files) on a currently-mounted volume.
The forms for optical session and partition are the same and are distinguished by context. floppy disks, RAID sets) contain filesystem data upon their "whole" device instead of containing a partitioning scheme with partitions.
The top-to-botom appearance of partitions shows the on-disk ordering.
For missing devices, old Device must be device's UUID.
Erasing a whole-disk will leave it useless until it is partitioned again.