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THEORY OF OPERA TION
8.4 OAT Cassette
The Python DDS-DC products are designed to use data-grade DDS DAT cassettes, which comply with the
specifications in the 3.81 mm Helical-Scan Digital Computer Tape Cassette for Information Interchange,
ANSI X3B5/89-156 standard. Archive recommends Archive-qualified, data-grade DDS DAT cassettes
(Archive Model M31300, 60 meters; Archive Model M32000, 90 meters) to ensure optimal data integrity
and reliability.
Archive also recommends the use of an Archive-qualified DDS DAT head-cleaning cassette (Archive Model
M7301).
NOTE: Proper maintenance of the Python drive requires that the DDS head-cleaning cassette
be used every
25 hours of read/write operation and whenever the rectangular green,
cassette-in-place LED flashes during operation.
Chapter 9 discusses the DDS DAT head-cleaning cassette in detail.
Both DAT data and head-cleaning cassettes can be ordered from Archive and are packaged in multiples of
five.
These small (approximately 2 inches x 3 inches x 0.4 inch) c.assettes house magnetic tape that is 3.81 mm
(0.150 inch) wide. The DAT cassettes are slightly bigger than a credit card. Figure 8-7 shows the DAT
cassette.
Figure 8-7
OAT
Cassette
Qualified DAT cassettes are designed with specific file protect, lid, and other features for information
interchange and are tested to comply with the ANSI DDS specifications.
8-11
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