Disk Drives; Disk Drive System Description - Nortel DMS-100 Series Product Manual

DPP Hardware 2-15
The Disk Controller PCA is found on Non-Turbo DPP systems with 72- and
140-MB disk drives. The ribbon cables connecting the Disk Controller PCA
to the disk drive unit are factory installed. DPP systems with 380- and 760
MB and 1- and 2-Gigabyte disk drives have integrated disk controllers.
The Fan Filter PCA is located on the bottom rear of both the A and B chassis,
near the Fan Assembly. There is also one Fan Assembly located behind the
Rover Interface Panel.

Disk Drives

Disk drive system description

The DPP employs two hard (fixed) disk drives (5 1/4" or 3 1/2"), located in
the lower left corner of each processor chassis, when viewed from the front of
the unit. The two disk drives are mounted on brackets, as illustrated in Figure
2-9.
The DPP's main programs for system operation are resident on disk. The
programs are automatically retrieved from disk and loaded to the Extended
Memory (DRAM) PCA and the optional 56K Interface upon power-up. Refer
to Figure 2-10 for an illustration of the various disk drive assemblies.
Programs are retained on disk as archives in case the processor(s) require a
reboot. The DPP system can be downloaded with new programs from the
DMS-100.
DPP Product Guide DPP001 and up