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9-2 Chapter 9, Mass Storage Configuration
Addendum 108431-001 (11-88) to
Manual No. 108033-003
□ Duplexing. The main difference between
mirroring and duplexing is that the two
drives in the mirrored unit operate off one
controller and the two fixed disk drives in
the duplexed unit operate off two control-
lers. An advantage of using dual controllers
for duplexing is that the data retrieval speed
is increased and the second controller pro-
vides additional protection if the
system fails.
Example: In a system where two drives are
duplexed, one drive may be
reading data while the other
drive is seeking the next block of
data. The information on both
fixed disk drives is the same.
NOTE: For information on component removal
and replacement, see Chapter 7,
REMOVAL AND REPLACEMENT
PROCEDURES. For information on
switch settings, see Chapter 8, JUMPER
SETTINGS AND SWITCH SETTINGS.
9.2 SYSTEM CONFIGURATION
NOTE: Internal cables are not interchangeable
between the system unit and the
expansion unit.
Maximum Storage
Use the device driver, EXTDISK.SYS, and an
operating system such as MS-DOS 3.31 or later to
access the capabilities of the 300-/600-Megabyte
fixed disk drive expansion unit.