Gestetner B147, Руководство по обслуживанию

Страница: 562 / 1081

PRINTER FUNCTIONS
B147/B149/B190 6-104 SM
6.14.2 HARD DISK
Overview
The capacity of the hard disk is 80 GB. The controller partitions it into several
drives and allocates them for different functions. You can initialize these partitions
as necessary (
SP5-832). The table lists the contents of the hard disk.
Contents Capacity (MB)
Volatile/
Nonvolatile
Initialization
(SP5-832)
37,500 Nonvolatile
Images
25,000 Volatile
002
Thumbnails 2,400 Nonvolatile 003
Job logs 10 Nonvolatile 004
Printer fonts 500 Nonvolatile 005
User information 100 Nonvolatile 006
Mail RX data 200 Nonvolatile 007
Mail TX data 1,000 Nonvolatile 008
1,256 Nonvolatile
Designer data
1,000 Volatile
009
Logs 150 Nonvolatile 010
Ricoh interfaces 500 Nonvolatile 011
Volatile: The data is lost when you turn the main switch off.
Nonvolatile: The data is retained when you turn the main switch off.
Data Transfer
The copier executes the direct memory access
(DMA) two times as fast as the conventional DMA.
The controller has two identical hard disk drives.
One HDD interface connects these drives with the
memory. There is a 32-bit data bus between the
memory and the HDD interface; and a 16-bit data
bus between the HDD interface and each hard
disk drive (two 16-bit data busses in total).
When receiving 32-bit data from the memory, the
HDD interface divides them into two 16-bit data
and transfers them to each hard disk drive. Hard
disk drive 1 stores data in an address; hard disk
drive 2 stores data in an address. These two
addresses correspond with each other. When
receiving two 16-bit data from two corresponding
addresses of the hard disk drives, the HDD
interface combines them and transfers 32-bit data to the memory.
If a bad sector is found in an address of one hard disk drive, the sector in the
corresponding address of the other hard disk drive is also treated as a bad sector.
B146D937.WMF
Memory
HDD Interface
HDD 1 HDD 2