| http://www.w3.org/ns/prov#value | - By way of example only, FIG. 4 illustrates a hard disk drive 441 that reads from or writes to non-removable, nonvolatile magnetic media, a magnetic disk drive 431 that reads from or writes to a removable, nonvolatile magnetic disk 432, and an optical disk drive 433 that reads from or writes to a removable, nonvolatile optical disk 436 such as a CD ROM or other optical media.
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