IBM 4690 - Manual (Page 34)

Drive-Performance Specifications
The following table lists the performance specifications for the tape drive .
Drive Performance
Feature Specification
Capacity 4.0 GB, 900 Oe 2 740 feet Travan cartridge
Effective backup rate 30 MB per minute typical
Data transfer rate 300/450/600 KB per second
Tape speed for Read/Write and
Search/Rewind 33, 51, or 77 ips
90 ips maximum
Recording method Serpentine
Recording format QIC 3095MC
Recording code 1,7 RLL
Error recovery Reed Solomon ECC
Recording unrecoverable errors Less than 1 in 10⁹ data Mb
Head configuration Wide write/narrow read
Recording media 900 Oe 740 feet Travan
Cartridge size 3.2 in. x 2.4 in. x 0.4 in.
(81 mm x 61 mm x 10.2 mm)
Synchronous transfer rate (burst) 5 MB per second maximum
Asynchronous transfer rate
(burst) 5 MB per second maximum
Soft errors less than 1 in 10⁶ bits
Environmental Requirements
The following table lists the environmental specifications for the tape drive. You
can mount the drive either vertically or horizontally.
Environmental Requirements
Specification Operational Nonoperational
Temperature +41° to +113°F 3
(+5° to +45°C)
−40° to +149°F 4
(−40° to +65°C)
Thermal gradient 1°C per minute
(no condensation) 20°C per hour
Relative humidity 20% to 80% noncondensing 3 5% to 95% noncondensing 4
Max wet bulb temperature 78.8°F (26°C) No condensation
Altitude −1000 to +15 000 feet −1000 to +50 000 feet
2. Oersted (Oe)
3. Mechanism and media
4. Mechanism
20 TR-4 Tape Drive User’s Guide