C-18 Sun Ultra 60 Service Manual • August 2001
C.1.8.3 Hard Drives
The system unit supports two SCSI hard drive capacities: 4.2-Gbyte and 9.1-Gbyte.
The 4.2-Gbyte hard drive is of the 1-inch form factor.The 9.1-Gbyte hard drive is of
the 1.6-inch form factor.All hard drives have a single connector configuration. A
drive bracket is used to mount the drive. TABLEC-5 lists the supported hard drives.
The 4.2-Gbyte Disk Drive Specifications, part number 802-7744, provides installation
instructions, power requirements,and performance data for the 4.2-Gbyte disk drive.
The 9-Gbyte Disk Drive Specifications, part number 802-7745, provides installation
instructions, power requirements,and performance data for the 9.1-Gbyte disk drive.
TRACK0 When active low,TRACK0 indicates that
thetrack zero sensor has been activated and
that the heads areover the outermost
cylinder.
WRITE_PROTECT When active low,WRITE_PROTECT
indicates that the inserted diskette is write-
protectedand that drive write operations
aredisabled.
READ_DATA When active, READ_DATAenables data
fromthe disk to be transferred to the host
throughthis signal line.
HEAD_SELECT When low,HEAD_SELECT selects head 1.
When high, HEAD_SELECT selects head 0.
DISK_CHANGE Whenlow, DISK_CHANGE indicates that
the drive tape medium has been changed.
DISK_CHANGEis reset when a new disk is
inserted and an enable signal is sent by the
host.
TABLEC-5 Supported Hard Drives
FormFactor
Dimension DiskDrive Capacity Wide RPM SeekTime
1.00-inch
(2.54 cm)
4.2 Gbyte Yes 7200 9.5 ms
1.63-inch
(41.3 cm) 9.1 Gbyte Yes 7200 9.5 ms
TABLEC-4 Diskette Drive Signals and Functions (Continued)
SignalName Function