Seagate Hawk 4XL Installation Manual page 24

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Table 4. Cable characteristics for single-ended circuits
I/O transfer rate
<10 M transfers/s 8 (reg. SCSI bus)
<10 M transfers/s 16 (wide SCSI bus)
<20 M transfers/s 4 (reg./wide SCSI bus) 3 meters (9.8 ft.)
<20 M transfers/s 8 (reg./wide SCSI bus) 1.5 meters (4.9 ft.)
For devices having differential I/O circuits, a maximum cable
length of 25 meters (82 feet) is allowed. A maximum of 8 devices
can be connected on an 8-bit wide data bus, and a maximum of
16 devices can be connected on a 16-bit wide data bus.
Hawk 4XL Installation Guide, Rev. A
Maximum number of
devices on line
Maximum cable
length allowed
6 meters (19.7 ft.)
6 meters (19.7 ft.)