Scsi Cable; Scsi Bus Terminator; Hot Plug/Unplug; Scsi Bus Electrical Characteristics - IBM IC35L036UWDY10 - Ultrastar 36.7 GB Hard Drive Specifications

7.1.3 SCSI cable

Refer to ANSI SPI-4.

7.1.4 SCSI bus terminator

Onboard SCSI active termination feature is not supported. The using system is responsible for making
sure that all required signals are terminated at both ends of the bus cable.
Terminator power
Termination power can be provided by the drive 5V supply through the current limiter and Schottky diode.
This function can be selected by jumper.
The 80-pin SCA-2 models do not support SCSI bus termination power.

7.1.5 Hot plug/unplug

The term 'Hot Plug' refers to the action of mechanically engaging a device to the power and/or bus when
other devices may be active on the same bus. A comprehensive classification of the state of the SCSI bus
during this event is located in the SCSI-3 Parallel Interface Standard.
While every effort was made to design the drive not to influence the SCSI bus during these events, it is the
responsibility of the system to insure voltage regulation and conformance to operational and non-
operational shock limits. During Hot Plug events the non-operational shock levels should not be ex-
ceeded. The operational shock levels of adjacent drives should also not be exceeded. The recommended
procedure is to prohibit write operations to adjacent drives during Hot Plug and Hot Unplug actions.
During Hot Unplug the operational shock limit specifications should not be exceeded. If this cannot be
guaranteed, the drive should be issued a SCSI Stop Unit command that is allowed to complete before
unplugging. The basic requirement is that while the drive is operational or spinning down the operational
shock limits are in effect. When the drive has completely stopped, the non-operational shock limits are in
effect. The recommended procedure is to allow the unplugged drive to rest in the drive bay for a minimum
of 15 seconds and then complete the removal. During Hot Plug or Unplug events the power supply ripple
on adjacent operational drives should not be outside the ±5 % regulation tolerance. It is recommended
that the system have current limiter for in-rush current as described in ANSI SPI-4.
Hot plugging/unplugging the 68-pin model drive to the power supply or to SCSI bus connector is not
allowed since provisions are not available to determine which electrical contact is made first. It may cause
glitches on the system SCSI bus and/or electrical over stress that may result in permanent damage of
electrical components of the drive. It is the responsibility of the system to protect the drive from these
situations when the 68-pin model is connected to the power supply or to SCSI bus.

7.1.6 SCSI bus electrical characteristics

Refer to ANSI SPI-4 for bus electrical characteristics.
NOTE: If the drive is connected to an HVD bus, the drive I/O will be permanently damaged.
Ultrastar 146Z10 hard disk drive specifications
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