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IBM 3430 magnetic tape subsystem

IBM 3430 Magnetic Tape Subsystem

IBM 3430 Magnetic Tape Subsystem
IBM 3430 Magnetic Tape Subsystem

The 3430 was a dual density, 50 inch-per-second tape drive. It read or wrote either 1600 bytes-per-inch phase encoded (PE) or 6250 bytes-per-inch group coded recording (GCR). The GCR mode provided more efficient detection and correction of tape read errors while the PE mode provided compatibility with and conversion of existing 1600 BPI tape files. GCR also provided a greater tape density (6250 BPI), which improved performance up to 312K bytes per second.

Two models were available in the 1980s:

Three Model B01s could be attached to a Model A01 for a maximum of four tape units per subsystem.

The 3430 Subsystem was compatible with existing tape subsystems and could be attached to the following host processors:

Some of the advantages provided by the 3430:

The side panels were offered in the following colors: pebble gray, garnet rose, classic blue, willow green, charcoal brown and sunrise yellow.

The 3430 was developed and manufactured at the IBM General Products Division facility in Tucson, Arizona.

Technical Summary
Model A Tape drive/controller
Model B Second, third and fourth drives in string

GCR PE
Density, BPI
6,250
1,600
Instantaneous data rate, KB/S
312
80
Tape speed, IPS
50
50
Maximum tape length, feet
2,400
2,400
Capacity MB
(block=16KB)
152
43
Rewind time
(2,400'), minutes
2.7
2.7
Interblock Gap*, inches
.45
.60
Read/Write access time, ms
6
6

* Difference in gap size did not prevent tape interchange with IBM 3420 tape drives.