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GE-235 M A S S RANDOM ACCESS DATA STORAGE
With the Mass Random Access Data Storage subsystem (abbreviated MRADS), information can be
accessed directly, eliminating the need to search through unrelated information a s
is
required in
the sequential processing of punched card and magnetic tape files. Such random access is
extremely valuable in applications where large volumes of information must be stored and
retrieved with minimum delay.
Each GE MRADS subsystem consists of a MRADS Controller,
a rotating disc assembly (or MRADS unit), and
an
electronics control cabinet. One o r two
MRADS controllers can be connected to the Controller Selector of the GE-235 Computer, with
each controller capable of controlling up to four MRADS units.
MASS RANDOM ACCESS DATA STORAGE UNIT
FORMATS
Speed of rotation of disc
Effective transfer rate:
Average latency time
Maximum latency time
Average positioning time
Maximum positioning time
Average access time
(including track verification)
1200 rpm
11,850 and 23,700 words/sec
26 ms
52 ms
199 m s
305 m s
225 ms
Each MRADS unit consists of 16 circular magnetic discs. Information is recorded serially in
256 circular tracks which make up each side of a disc. Eight 64-word records a r e recorded in
each of the 128 inner tracks.
Sixteen 64-word records a r e recorded in each of the 128 outer
tracks.
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