Dat 72 And Dds-4 Capacity And Transfer Rates - Seagate CD72LWH Product Manual

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DAT 72 and DDS-4 Capacity and Transfer Rates

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
The DAT 72 and DDS-4 drives provide the following capacities and transfer rates,
depending on the recording mode and the tape length:
DDS-2*
Tape length 120 meters
Capacity 4.0 Gbytes
(native)
Capacity 8 Gbytes
(compressed)
Transfer rate 1.375
(native) Mbytes/sec
* Applies to the DDS-4 drive only.
DAT 72/DDS-4 Product Manual
Recording Mode
DDS-3 DDS-4
125 meters 150 meters
12.0 20.0 Gbytes
Gbytes
24 Gbytes 40 Gbytes
2.75 2.75
Mbytes/sec Mbytes/sec
th
DDS 5 Generation
170 meters
36.0 Gbytes
72 Gbytes
3.54 Mbytes/sec