Subdirectory

In a hierarchical disk directory structure, a group of files in a directory that is contained within another directory or the root directory.

Switch

An optional specifier added to an MS-DOS command that modifies the way the command works. Switches are typically preceded by a / (forward slash). See also Command and Parameter.

System diagnostics

A series of tests you can perform on the computer’s components and some peripheral devices to make sure they are functioning correctly.

System diskette

A diskette that contains the operating system and that can be used to boot the computer.

Tape drive

The physical device that allows you to insert large-capacity magnetic tape cartridges for compact data storage and backup.

Tracks

Addressable, concentric circles on a disk, resembling the grooves on a record, which divide the disk into separate accessible areas. On a tape cassette, the tracks run parallel to the edge.of the tape. See also Sector.

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