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(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)
Pin pair 9/10 of CN2
(GND/WTP)
Write protect
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)
Pin pair 15/16 of CN2
(GND/DIFFSENS)
Operation mode
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)
Pin pair 13/14 of CN2
(GND/8/16 SW)
Bus width
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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