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Maintenance and Service Guide 9-1
Addendum 108431-001 (11-88) to
Manual No. 108033-003
9.1 THEORY OF OPERATION
The 300-/600-Megabyte Fixed Disk Drive
Expansion Unit can be used with a COMPAQ
DESKPRO 386-based Personal Computer with
system ROM revision G or later. The expansion
unit can be used as a normal external fixed disk
drive for maximum storage or in a mirroring
or duplexing mode. The three options are
described below:
□ Maximum storage. This gives you the maxi-
mum storage space available in the drives.
Example: With dual 300-Megabyte fixed
disk drives installed in the
expansion unit, you would have
a total storage capability of 600
megabytes of information. Two
expansion units configured this
way would give you a maximum
of 1.2 gigabytes of storage.
□ Mirroring. In mirroring, two identical fixed
disk drives are connected to a single con-
troller. Special software causes both drives
to read and write the same information.
Example: In this case, the same two 300
megabyte drives would only
have a total storage capability
of 300 megabytes, since the two
drives would contain exactly the
same information. However, this
in turn would keep the system
operational and the stored data
intact if the hardware for one
fixed disk drive failed.
Chapter 9
MASS STORAGE
CONFIGURATION