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CASSETTE IN PLACE (GREEN)
DRIVE BUSY (AMBER) EJECT BUTTON
CASSETTE INSERTION SLOT
The DDS-DC and DDS drives use standard 60-metre or
90-metre digital cassettes bearing the DDS symbol. The
DDS-DC drive writes compressed data by default, unless
it finds uncompressed data already on the cassette. The
drive can also write uncompressed data under software
control. When reading a cassette, the DDS-DC drive
automatically distinguishes compressed and
uncompressed data and either decompresses it or passes
it through unaltered as appropriate.
Use only cassettes bearing the DDS symbol; you
cannot play audio DAT cassettes with these drives,
even on systems equipped with Apricot Professional
Audio.
The DDS drive has a nominal capacity of 1.3 Gbytes on a
60-metre cassette, with a sustained transfer rate of 183
Kbytes/second.
The DDS-DC drive writing uncompressed data has a
nominal capacity of 1.3 Gbytes on a 60-metre cassette or
2.0 Gbytes on a 90-metre cassette, with a sustained
transfer rate of 366 Kbytes/second. At a data
compression ratio of 4:1 the DDS-DC drive has a nominal
maximum capacity of 5.2 Gbytes on a 60-metre cassette
or 8.0 Gbytes on a 90-metre cassette; the sustained
transfer rate is increased by the same ratio. However, the
actual compression ratio and transfer rate achievable in
