By way of example only, FIG. 2 illustrates a hard disk drive 27 that reads from or writes to non-removable, nonvolatile magnetic media such as hard disk 60, a magnetic disk drive 28 that reads from or writes to a removable, nonvolatile magnetic disk 29, and an optical disk drive 30 that reads from or writes to a removable, nonvolatile optical disk 31 such as a CD ROM or other optical media.