Fujitsu MBA3147NP, MBA3073NP, MBA3073NC manual Write protect setting NP model, Gnd/Wtp, Gnd/Diffsens

(3)Write protect

When the write protect function is enabled on NP model, writing to the disk medium is disabled.

Table 5.4 Write protect setting (NP model)

Write protect	Pin pair 9/10 of CN2
	(GND/WTP)
Write operation is enabled.	Open (*1)
Write operation is disable.	Short
*1. Set at factory shipment.

For NC model, the function of the write protect setting is not supported.

(4)Setting of the SCSI interface operation mode

By establishing a short-circuit between CN2-15 amd CN2-16 on NP model, the SCSI interface operation mode is forcibly set to the single-ended mode. When this setup terminal is open, the HDD automatically identifies the DIFFSNS signal level on the SCSI bus and the HDD SCSI interface operation mode is set to the operation mode.

Table 5.5 Setting of the SCSI interface operation mode (NP model)

Operation mode	Pin pair 15/16 of CN2
	(GND/DIFFSENS)
Follows the DIFFSNS signal level on the SCSI bus	Open (*1)
Single-Ended mode	Short
*1. Set at factory shipment.

For NC model, the function of the SCSI interface operation mode is not supported, so the SCSI interface operation mode follows the level of the DIFFSNS signal on the SCSI bus.

(5)Setting the bus width of the SCSI interface

By establishing a short-circuit between CN2-13 and CN2-14 on NP model, the bus width for the SCSI interface is forcibly set to the 8-bit bus mode. This setup terminal must be set in order to guarantee the physical level of the SCSI interface’s upper bus (DB8-15, P1) inside the HDD only when the top-level bus (DB8-15, P1) for the HDD SCSI interface is not connected to the external part of the HDD.

Table 5.6 Setting the bus width of the SCSI interface (NP model)

Bus width	Pin pair 13/14 of CN2
	(GND/8/16 SW)
16-bit bus	Open (*1)
8-bit bus	Short
*1. Set at factory shipment.

For NC model, the function of the bus width setting for the SCSI interface is not supported.

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