| http://www.w3.org/ns/prov#value | - The computer system 10 may further include a hard disk drive 227 for reading from and writing to a hard disk, a magnetic disk drive 228 for reading from and writing to a removable magnetic disk 229, and an optical disk drive 230 for reading from and writing to a removable optical disk 231, such as a CD ROM or other optical media.
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