Boots – shoes – and leggings
Patent
1976-02-02
1980-09-16
Springborn, Harvey E.
Boots, shoes, and leggings
G06F 1300
Patent
active
042233909
ABSTRACT:
A system and method attach a second magnetic storage device to a storage subsystem which includes one or more first magnetic storage devices. The track capacity of the first device, i.e., the maximum number of bytes per track, is different from the track capacity of the second device. The information stored on the first device is formatted with a first recording format wherein the start of each individual record measured in the number of bytes from the start of the track varies with either the number of records preceding it, or the length of each preceding record, e.g., a count-key-and-data format. The method involves the steps of generating a "bytes used" number in the second device which reflects, at predetermined times, the number of bytes between the start of a track and the start of each record if the record had been written on the first device in the first format; recording the "bytes used" number in a "bytes used" field of each record each time each record is recorded on the second device; and generating a virtual index signal when the "bytes used" number corresponds to the track capacity of the first device. The system comprises a counter in the second device, a clock signal for stepping the counter at a rate which corresponds to the data rate of the second device, and a plurality of circuits for controlling the operation of the counter so that the contents thereof, at the time each record is to be written, reflects the number of bytes between the start of the track and the start of each record if the record had been written on the first device in the first format. Circuitry is also provided for transferring the contents of a counter to the recording circuits of the device at preselected times. The system also includes a signal generator, which is connected to the counter, and, at a time when the contents of the counter corresponds to the track capacity of the first device, issues a virtual index signal.
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Bowers Earl Q.
Nelson David L.
Cummins Richard E.
International Business Machines - Corporation
Springborn Harvey E.
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