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Browse Prior Art Database

Record Hold Arrangement

IP.com Disclosure Number: IPCOM000097415D
Original Publication Date: 1962-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Rowe, TH: AUTHOR

Abstract

The arrangement identifies records in a file so as to put them on a hold status. It permits several completely independent sources (computers) to use a common file for their storage. For example, if one computer withdraws information from the disc storage files and another computer requires the same information, it must wait until the information is returned to the storage file by the first computer.

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Record Hold Arrangement

The arrangement identifies records in a file so as to put them on a hold status. It permits several completely independent sources (computers) to use a common file for their storage. For example, if one computer withdraws information from the disc storage files and another computer requires the same information, it must wait until the information is returned to the storage file by the first computer.

A separate status disc surface 11 includes its own read and write heads 14 and 15. These track with the access mechanism 16 of the data storage disc or file 12 to record coded bits that identify a record area in disc 12 as being in hold status. When a record is read from disc 12 by the read-write head 18 for updating, the identifying hold-bits are written on the status surface 11. This occurs at the time the address compare or other record identifying is completed and the reading operation has started. When the updated record is written back into disc 12, the record hold-bits on status surface 11 are erased or changed to indicate that the particular data is available.

Read head 14 is positioned several characters in front of the write head 15. Thus, on the same revolution of the disc, head 14 first tests for a record-in-hold status and then head 15 writes a record-in- hold status on surface 11, if the record is available.

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