Hard Disk - Gestetner B147 Service Manual

PRINTER FUNCTIONS

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
Images
Thumbnails
Job logs
Printer fonts
User information
Mail RX data
Mail TX data
Designer data
Logs
Ricoh interfaces
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.
B147/B149/B190
Capacity (MB)
37,500
25,000
2,400
10
500
100
200
1,000
1,256
1,000
150
500
6-104
Volatile/
Nonvolatile
Nonvolatile
Volatile
Nonvolatile
Nonvolatile
Nonvolatile
Nonvolatile
Nonvolatile
Nonvolatile
Nonvolatile
Volatile
Nonvolatile
Nonvolatile
HDD Interface
HDD 1
Initialization
(SP5-832)
002
003
004
005
006
007
008
009
010
011
Memory
HDD 2
B146D937.WMF
SM