IBM F50 RS/6000 7025 - Manual (Page 59)

Tape Cartridge Compatibility
The 4-mm Tape Drive is compatible with existing 4mm tape subsystems that are
designed to operate with Digital Data Storage approved media, which meet the
following standards:
For DDS||||
– American National Standard (ANSI) standard, X3.203-191, Helical-scan
Digital Computer Tape Cartridge, 3.81mm.
– European Computer Manufacturers Association (EMCA) standard,
EMCA-150 , 3.81mm Wide Magnetic Tape Cartridge and DDS|||| format.
For DDS2
– European Computer Manufacturers Association (EMCA) standard,
EMCA/TC17/93/20, 3.81mm Wide Magnetic Tape Cartridge for Information
Interchange Helical Scan Recording, DDS2 format.
You cannot change the density setting of the drive, because the device reconfigures
itself automatically, depending on the media type installed, as follows:
Media Type Device Configuration
Non-DDS Read-only
DDS|||| Read/write in 2.0GB mode only.
DDS2 Read in either density; write in 4.0GB mode only.
Chapter 2. Using the System Unit 2-33