Caution: Repartitioning a disk makes the data on the disk inaccessible (you must repartition back to the original partitions to get to it). Before repartitioning a disk, if there is any valuable data on the disk to be repartitioned, make a backup of the files on the disk. If the disk is a system disk and you plan to copy the files from the backup to the disk after repartitioning, you must use either the System Manager or the Backup command. Only backups made with Backup or the System Manager will be available to the system from the System Recovery menu of the System Maintenance Menu. The System Manager is the preferred method of the two and is described completely in the Personal System Administration Guide. Other commands require a full system installation to operate correctly.