Temperature/humidity floppy disk cassette defeat mechanism

Details Temperature/humidity floppy disk cassette defeat mechanism Temperature/humidity floppy disk cassette defeat mechanism

1987-11-19

1989-06-13

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

360 60, G11B 1518, G11B 1700

Patent

active

048397520

ABSTRACT:
A defeat mechanism serves to prevent a floppy disk cassette from being operatively loaded into a drive mechanism when the cassette has been subjected to either a high-moisture or a high-temperature condition--either environment being potentially harmful to the recording capability of a floppy disk. The defeat mechanism includes a wax which melts in a high-temperature environment and a hygroscopic salt which breaks down in a high-moisture condition. If either the wax or the salt changes from a solid form, a control element of the defeat mechanism automatically moves into an actuated position which prevents the operative loading of the cassette.

REFERENCES:
patent: 2446361 (1948-08-01), Clibbon
patent: 4119195 (1978-10-01), Widoner
patent: 4457430 (1984-07-01), Darling
patent: 4488646 (1984-12-01), McCorkle
patent: 4539929 (1985-09-01), Sestak

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