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1-2 C141-E226
1.1 Standard Features
(1) Compactness
Since the SCSI controller circuit is embedded in the standard 3.5 inch hard disk drive form factor,
the HDD is extremely compact. The HDD can be connected directly to the SCSI bus of the host
system.
(2) Restriction of Use of Hazardous Substances
The amounts of hazardous substances in use in these HDDs have been reduced in accordance with
the Restriction of Use of Hazardous Substances (RoHS) Directive recently issued by European
Union (EU).
Note:
At present, the permissible limits on the use of certain materials specified by the RoHS
directive have not been determined. In such cases, we are using the original criteria set by
Fujitsu Limited while referring to the restrictions already established by End-of-Life Vehicle
(ELV) Directive or by the national environmental laws of the EU member nations.
(3) SCSI standard
The HDD provides not only SCSI basic functions but also the following features:
• Arbitration
• Disconnection/Reconnection
• Data bus parity
The SCSI commands can manipulate data through logical block addressing regardless of the
physical characteristics of the disk drive. This allows software to accommodate future expansion
of system functions.
(4) 8-bit SCSI/16-bit SCSI
The HDD has 16-bit data bus width (16-bit SCSI), which have the wide transfer function suitable
for SCSI-2. 8-bit data bus is available only with NP model.
See subsection 5.3.2 for details of the bus width setting.
For the ultra SCSI model, number of connectable SCSI devices on the same SCSI bus is varied as
follows.
• 8-bit SCSI: 8 drives max. (option for NP model)
• 16-bit SCSI: 16 drives max.