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Overview
1-5
Compaq Confidential – Need to Know Required
Writer: Debbie McRill Project: Compaq DAT AutoLoader Reference Guide Comments:
Part Number: 326817-003 File Name: b-ch1 Overview.doc Last Saved On: 1/25/00 9:55 AM
The DAT AutoLoader uses jumper pins and/or dip switches for settings. Some
hardware settings may be overridden by way of software. Consult your backup
application software documentation for the data compression enabling and
disabling procedure.
For information on jumper pin settings for data compression, see “Configuring
the AutoLoader” in Chapter 2.
Cassette Formats
The Compaq 20/40 GB DAT 8-Cassette AutoLoader supports
industry-standard Digital Data Storage (DDS), Digital Data Storage Data
Compression (DDS-DC), Digital Data Storage-2 (DDS-2), Digital Data
Storage-3 (DDS-3), and Digital Data Storage-4 (DDS-4) formats.
IMPORTANT:
For product reliability Compaq recommends using only cassettes
purchased from vendors that have been approved by Compaq (See Table 1-2 for list of
approved cassettes).
These formats were introduced by the DDS Manufacturers’ Group and are
approved by the American National Standards Institute (ANSI) and the
European Computer Manufacturers’ Association (ECMA). The DDS-DC
format is a superset of the DDS format, ensuring backward compatibility with
uncompressed cassettes.
To use the full potential of a DDS-format drive, you should use matching
cassettes, that is, DDS-4 cassettes for DDS-4 drives. This allows the drives to
store the maximum amount of data on a cassette. Refer to Table 1-2 for a list
of Compaq approved cassettes.
Table 1-2
Compaq Approved Cassettes
DDS1 DDS2 DDS3 DDS4
Sony 60m (DG-60M) Sony 125m, (DGD-125m)
Fuji 90m, (DG-90M) Fuji 120m, (DG-120M) Fuji 125m, (DG3-125m) Fuji 150m, (DG4-150m)
Maxell 120m, HS 4/120s Maxell 125m, HS 4/125s Maxell 150m, HS 4/150s
Note:
A DDS-4 drive can read and write to DDS-3, DDS-2, or DDS-1 cassettes.