Hewlett-Packard SureStore 125ex Optical Jukebox User's Guide - C1118-90000

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OPERATING THIS JUKEBOX ON A SCSI BUS
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MIXING WIDE AND NARROW DEVICES
As a preliminary note to this discussion, HP highly recommends that you do NOT mix wide and narrow buses.
Connecting devices of the same bus width, such as all narrow (50-pin) is a simple process of daisy-chaining the devices,
and terminating both ends of the bus.
Mixing narrow and wide devices invites problems. Mixing narrow and wide devices on a bus should be done only by a
person experienced in SCSI configurations.
Because wide (68-pin) buses need more data lines on the bus for data transfer, it’s necessary for the cables connecting
the devices to be 68 pin. Data would be lost if the devices were set up as depicted in the figure below.