HP Surestore 125ex - Optical Jukebox Manual page 105

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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.
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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
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the devices to be 68 pin. Data would be lost if the devices were set up as depicted in the figure below.
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