HP Portable 386 Compaq Portable 386 Personal Computer Maintenance and Service - Page 160

Mass Storage Configurations, Introduction

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Chapter 10. Mass Storage Configurations Chapter 10.1 Introduction The 300/600 Megabyte Fixed Disk Drive Expansion Unit (hereafter referred to as the fixed disk drive expansion unit) can be used with the COMPAQ PORTABLE 386 Personal Computer with system ROM revision K.0P or later. The fixed disk drive expansion unit can be used as a normal external fixed disk drive for maximum storage or in a mirroring or duplexing mode. The options are described below: o Maximum storage. This gives you the maximum storage space available in the drives. Example: With two 300 megabyte fixed disk drives installed in the fixed disk drive expansion unit, you have a total storage capability of 600 megabytes of information. Two fixed disk drive expansion units configured this way give you a maximum of 1.2 gigabytes of storage. o Mirroring. In mirroring, two identical fixed disk drives are connected to a single fixed disk drive controller. Special software causes both drives to read and write the same information. Example: In this case the same two 300 megabyte fixed disk drives have a total storage capability of 300 megabytes, since the two fixed disk drives contain exactly the same information. However, this keeps the system operational and the stored data intact if the hardware for one fixed disk drive fails. o Duplexing. In duplexing, the two identical fixed disk drives operate using two controllers. An advantage of using dual controllers for duplexing is that the data retrieval speed is increased and the redundant controller provides additional protection if the system fails. Example: In a system where two fixed disk 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 removal and replacement, see Chapter 8, "Removal and Replacement Procedures." For information on switch settings, see Chapter 9, "Jumper and Switch Settings." Chapter 10.2 System Configuration NOTE: Internal cables are not interchangeable between the COMPAQ PORTABLE 386 and the fixed disk drive expansion unit. Maximum Storage The EXTDISK software that came with the fixed disk drive expansion unit contains several software utilities. Use the device driver EXTDISK.SYS, and an operating system such as MS-DOS Version 3.31 or later to access the capabilities of the fixed disk drive expansion unit.

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Chapter 10. Mass Storage Configurations
Chapter 10.1 Introduction
The 300/600 Megabyte Fixed Disk Drive Expansion Unit (hereafter referred to as
the fixed disk drive expansion unit) can be used with the COMPAQ
PORTABLE 386 Personal Computer with system ROM revision K.0P or later. The
fixed disk drive expansion unit can be used as a normal external fixed disk
drive for maximum storage or in a mirroring or duplexing mode. The options
are described below:
o Maximum storage. This gives you the maximum storage space available in the
drives.
Example: With two 300 megabyte fixed disk drives installed in the fixed
disk drive expansion unit, you have a total storage capability of
600 megabytes of information. Two fixed disk drive expansion units
configured this way give you a maximum of 1.2 gigabytes of storage.
o Mirroring. In mirroring, two identical fixed disk drives are connected to
a single fixed disk drive controller. Special software causes both drives
to read and write the same information.
Example: In this case the same two 300 megabyte fixed disk drives have a
total storage capability of 300 megabytes, since the two fixed disk drives
contain exactly the same information. However, this keeps the system
operational and the stored data intact if the hardware for one fixed disk
drive fails.
o Duplexing. In duplexing, the two identical fixed disk drives operate using
two controllers. An advantage of using dual controllers for duplexing is
that the data retrieval speed is increased and the redundant controller
provides additional protection if the system fails.
Example: In a system where two fixed disk 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 removal and replacement, see Chapter 8, "Removal and
Replacement Procedures." For information on switch settings, see Chapter 9,
"Jumper and Switch Settings."
Chapter 10.2 System Configuration
NOTE: Internal cables are not interchangeable between the COMPAQ
PORTABLE 386 and the fixed disk drive expansion unit.
Maximum Storage
The EXTDISK software that came with the fixed disk drive expansion unit
contains several software utilities. Use the device driver EXTDISK.SYS, and
an operating system such as MS-DOS Version 3.31 or later to access the
capabilities of the fixed disk drive expansion unit.