Is included in SCSI-3 standard at portion of the parallel SCSI standard which, simultaneous transfer capacity at 8 bit width specification of transfer rate 20MB/s.
In the specification which raises transfer rate with the drive frequency of former SCSI-2 (Fast SCSI) as time, maximum cable length at the time of single-end drive with 8 connections to 1.5m, with 4 unit connections to 3m, at the time of differential drive (HVD) at the time of 8 connection has become to 25m.
After that if with differential drive (LVD) of the voltage which is introduced from Ultra2 SCSI which appears it operates low, while maintaining the single-end equipment and compatibility, even at the time of 8 unit connection to 12m extended possibility.
There is also a Wide Ultra SCSI specification which does transfer at 16 bit width, this transfer rate is 40MB/s.
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