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Data transfer Rate
2.3.2.
The sustained transfer rate to and from the tape is 24Mbyte per second with AIT-4 cassette. For this sustained rate
to be achieved, the drive must be streaming. There may be some dependency on the host for this to be achieved.
When data compression is enabled the drive can achieve a transfer rate from 48Mbyte per second to 72Mbyte per
second with AIT-4 cassette.
The SDX-900V will transmit and receive data bursts to and from the SCSI bus at a maximum burst rate of 12Mbyte
per second, using Ultra 160 asynchronous transfers and maximum of 160Mbyte per second, using Ultra160
synchronous transfers.
Initialize Time
2.3.3.
Initialize Time means the period from the time the drive is powered on to the time when the drive is ready and waiting
for a SCSI command such as INQUIRY or TEST UNIT READY. Initialize Time is less than 5 seconds.
The drive will respond with BUSY status until the completion of the Initialize Time. The Initialize Time does not
include the time necessary for drive diagnostics to complete and the drive to become ready for tape insertion.
Load Time
2.3.4.
Load Time means the period from the time when the operator inserts a cassette into the drive to the time when the
drive is ready. The data in the below table represents the average time for SDX-900V. The time it may take for
retrying is not reflected here.
Unload Time
2.3.5.
Unload Time means the period from the beginning of the unload sequence caused by Unload Command or Eject
button to the time when a cassette is ejected from the slot. Unload Time does not include Rewind time. The data in
the below table represents the average time for SDX-900V. The time it may take for retrying is not reflected here.
Search Time
2.3.6.
Search Time means the period for the drive to find the position that is required by a command. This time also
depends on the tape length and the position of the head along the tape. The data in the below table represents the
average time for SDX-900V. The time it may take for retrying is not reflected here.
Rewind Time
2.3.7.
Rewind Time means the period from the beginning to the end of rewinding sequence. This value depends on the
tape length and the position of the head along the tape. The data in the below table represents the average time for
SDX-900V. The time it may take for retrying is not reflected here.
SONY AIT-4 drive SDX-900V series Ver.2.1
2.3.2.1.
Sustained Data Transfer Rate to and from
the Tape
Burst Transfer Rate to and from the SCSI Bus
2.3.2.2.
Load Time
Unload Time
Search Time
Rewind Time
SDX4-200C (246 m)
14 sec
SDX4-200C (246 m)
24 sec
SDX4-200C (246 m)
130 sec
SDX4-200C (246 m)
115 sec
2.Specification
2-7
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