Method and apparatus for updating optical memory disc

Details Method and apparatus for updating optical memory disc Method and apparatus for updating optical memory disc

1985-10-16

1987-07-21

Canney, Vincent P.

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

360 39, G11B 576, G11B 509

Patent

active

046823182

ABSTRACT:
A method of updating an optical memory disc, the disc being of the type that has a plurality of zones, one of the zones containing at least one directory block that includes a plurality of entries in the form of addresses which point at data. The method comprising the steps of reading the entries of the one directory block into a temporary location; altering the entries of the one directory block with new directory information; dividing the entries of the one directory block into two new directory blocks, each of the new directory blocks being designated by a separate pointer; writing the two new directory blocks from the temporary location onto the optical memory disc; and storing the pointers in a new directory pointer block of the optical memory disc, whereby subsequent addition of new directory information requires the alteration of less than all of the directory blocks.

REFERENCES:
patent: 4562577 (1985-12-01), Glover et al.

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