Technical data

Introduction
The DAT drive (Digital Audio Tape) DAT 72 is a magnetic tape drive for DAT 72 cartridges and
DDS3 and DDS4 cartidges (Digital Data Storage).
A cartridge is an inexpensive mass storage which is particularly suitable for creating backup copies
and archiving data.
Depending on the tape length, cartridges are automatically written in the following formats:
125 m tape length DDS-3
150 m tape length DDS-4
170 m tape length DAT 72
The DAT drive is compatible with older drives and drives from other manufacturers which write to the
cartridges in standard DDS formats. The data compression of the DAT drive is carried out in DCLZ
mode (Data Compression Lempel Ziv).
Functions
i
The DAT drive is available in two models, as a 5 1/4 inch (Streamer H938) and as a 3 1/2
inch version (Streamer H939). The 3 1/2 inch version is delivered mounted in a carrier and
can be installed during operation (hot-swap). Both drives are technically identical.
Therefore, in order to operate the DAT drive the computer must have a SCSI host adapter
and the appropriate SCSI and device drivers must be installed.
DDS cartridges with a 60 m, 90 m and 120 m tape length are not supported.
The DAT drive is equipped with the following properties/functions:
● a SCSI interface of the type Ultra2 Wide LVD/SE (Low Voltage Differential or Single-Ended).
● a memory capacity of 36.0 Gbyte (without compression) or 72.0 Gbyte (with 2:1-compression).
● a 68-pin Wide SCSI port
● a maximum continuous data transfer rate of up to 3.5 MB per second without compression
● an internal buffer of 16 MB
This manual contains all the information you require to install and operate the streamer.
To install the drive, you need some knowledge of hardware. Make sure you observe the instructions
in the "Important notes" chapter of your computer's operating manual.
In the event of any problems occurring, please contact your sales outlet or your customer service
center.
Further information
• How to mount a drive in the computer is described in the following manuals:
− Operating manual for your computer
− Technical Manual for your computer
• Information about the SCSI interface can be found in the following manuals:
− Technical Manual for the SCSI board
− Operating manual for your computer
− Technical Manual for your computer
• For information on the required SCSI drivers and the backup software, refer to the software
documentation.
A26361-H939-Z100-1-7419 English - 1