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14. Appendix F
Cassette OUT
1s
Cassette UP
Device
7s
Area
10s
30s
(0s)
(17s)
5s
(0s)
7s
(9s)
Device
Area
5s
(0s)
Search System Area
4s
17s
(12s)
7s
Threading
Cassette DOWN
1s
Cassette IN
14.2.2. Super High Speed Search
The Super High Speed Search Map maintained by the drive contains physical medium positioning information that
allows the AIT drive to conduct super high speed, bi-directional searches using the 120 inches per second speed
mode previously employed only for cartridge rewind. Once the drive reaches the tape segment identified by the MIC
information, its speed drops to the standard search speed of 60 inch per second, and then the drive locates the
tape's precise position by reading the identifier blocks directly from the tape. This technique can reduce the average
access time to as little as 27 seconds, a 50% improvement.
The map is transparently managed by the drive. It is created at the bottom of MIC's memory address. The map
cannot be cleared nor discarded, unless the Mode Select command is issued instructing the drive to re-format the
cassette.
14-4
System
Area
Threading
Rewind to Middle of Device Area
Write Volume Info. & System Log
Search System start of Area
Figure F-4: Tape Unload with and without MIC
System
Area
Stand by here
Read Volume Info. & System Log
Figure F-5: Tape Load with and without MIC
Data
EOD
Area
Area
Rewind
Data
EOD
Area
Area
SONY AIT-1 Turbo drive SDX-470V series Ver.1.0
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