Process for writing with updating and reading informations on a

Details Process for writing with updating and reading informations on a Process for writing with updating and reading informations on a

1986-11-26

1989-02-21

Shoop, Jr., William M.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 30, 369 44, 360 721, 360 722, G11B 1722

Patent

active

048072052

ABSTRACT:
A process for writing with updating and reading informations on a non-erasable support organized in sector form. Each sector comprises a synchronization field, a data field, a length field, a type field, an address field and a redundancy field. The data information to be stored and its length are respectively written into the data and length fields. The value written into the type field indicates whether the data information can be updated or not. If updating is possible, the address field receives a pointer designating the free sector of the support, so that said sector is reserved for a possible updating. If updating is not possible, a predetermined value is written in the address field. The error correcting code written in the redundancy field takes account of the contents of the data, length, type and address fields. Writing in all the fields of a sector takes place in a single writing operation.

REFERENCES:
patent: 4142209 (1979-02-01), Hedlund
patent: 4307418 (1981-12-01), Mindel et al.
patent: 4375091 (1983-02-01), Dakin et al.
patent: 4506355 (1985-03-01), Dakin et al.
patent: 4535439 (1985-08-01), Satoh et al.
patent: 4545043 (1985-10-01), Anderson et al.
patent: 4641294 (1987-02-01), Yoshimaru
IBM Technical Disclosure Bulletin, vol. 24, No. 1B, Jun. 1981.

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