| http://www.w3.org/ns/prov#value | - By way of example only, FIG. 4 illustrates a hard disk drive 422 that reads from or writes to non-removable, nonvolatile magnetic media, a magnetic disk drive 424 that reads from or writes to a removable, nonvolatile magnetic disk 426, and an optical disk drive 428 that reads from or writes to a removable, nonvolatile optical disk 430 such as a CD ROM or other optical media.
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