Gestetner B147 Service Manual page 957

What This Manual Contains
This manual describes the DataOverwriteSecurity (DOS) Unit Type A/B for:
• B147/B149
• B135/B138
• B089/B093.
The DOS unit is an optional DIMM (or SD card) that contains special firmware. At
the end of every job, this special firmware overwrites every cluster in temporary
storage on the HDD twice with random data. Then each cluster is once again
overwritten with a zero. This erases sensitive data on the disk which could be
retrieved secretly.
Conventions in this Manual
This manual uses several symbols.
Symbol What it means
Refer to section number
!

See Core Tech Manual for details
 Screw
 Connector

E-ring

Clip ring
Short Edge Feed (SEF) Long Edge Feed (LEF)