CertiGuide to A+ (Core Hardware) - Digital Audio Tape (DAT)

These tapes use an ingenious method of writing large amounts of data to a very small amount of magnetic tape.

The read-write head of the drive is actually comprised of two separate read heads and two separate write heads placed at right angles to each other on a small circular piece of hardware.

The read write head is then tilted at an angle so that bits of data are recorded diagonally on the tape. This efficient use of the surface area on the tape allows for more data to be stored.

Additionally, one write head can write data bits at a diagonal that is perpendicular to its opposing write-head, effectively doubling the capacity of the tape.

**Figure 80: DAT read-write heads and tracks**

VII Tape Drives

Tape Drive Challenges

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Version 1.0 - Version Date: December 6, 2004

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