User's Manual

2
DAT 72/DDS-4 Product Manual
The DAT 72 and DDS-4 drives support DDS data compression. Compression
doubles a drive’s uncompressed capacity. For example, a 20 GB uncompressed
drive will be 40 GB with compression.
The DDS-4 drive complies with the following guidelines and specifications:
•
The DDS-2 recording format standard, ANSI/ECMA-198,
3,81mm Wide Magnetic
Tape Cartridge for Information Interchange - Helical Scan Recording - DDS-2
Format using 120 m Length Tapes
•
The DDS-3 recording format standard, ANSI/ECMA-236,
3,81mm Wide Magnetic
Tape Cartridge for Information Interchange - Helical Scan Recording - DDS-3
Format using 125 m Length Tapes
•
The DDS-4 recording format specification from ECMA-288:
3,81 mm Wide
Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording:
DDS-4 Format
The DAT 72 drive complies with the following guidelines and specifications:
•
The DDS-3 recording format standard, ANSI/ECMA-236,
3,81mm Wide Magnetic
Tape Cartridge for Information Interchange - Helical Scan Recording - DDS-3
Format using 125 m Length Tapes
•
The DDS-4 recording format specification from ECMA-288:
3,81 mm Wide
Magnetic Tape Cartridge for Information Interchange - Helical Scan Recording:
DDS-4 Format
•
The DDS 5th Generation recording format specification from the HP DAT 72
Format Standard A5969-3050-1:
3,81 mm Wide Magnetic Tape Cartridge for
Information Interchange - Helical Scan Recording - DAT 72 Format Using 170 m
Length Tapes
.
Note:
For the latest ECMA standards, see the ECMA web site at
http://www.ecma.ch
DAT 72 and DDS-4 Capacity and Transfer Rates
The DAT 72 and DDS-4 drives provide the following capacities and transfer rates,
depending on the recording mode and the tape length:
Recording Mode
DDS-2*
DDS-3
DDS-4
DDS 5
th
Generation
Tape length
120 meters
125 meters
150 meters
170 meters
Capacity
(native)
4.0 Gbytes
12.0
Gbytes
20.0 Gbytes
36.0 Gbytes
Capacity
(compressed)
8 Gbytes
24 Gbytes
40 Gbytes
72 Gbytes
Transfer rate
(native)
1.375
Mbytes/sec
2.75
Mbytes/sec
2.75
Mbytes/sec
3.54 Mbytes/sec
* Applies to the DDS-4 drive only.