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Sony Corporation

Tomonao Uchida

Hideki Nonoyama

Mark Robert Watkins

Nigel Kevin Rushton

Robert Alan Williams

A sequence of data blocks written onto a medium of a data storage system includes first and subsequent appended data blocks having an append point code for identifying the first appended data block location. For data blocks having a running block number or frame number, the block or frame number of the first appended data block is stored as the append point code. The appended point code identifies the most recently append point location and aids in processes, such as tracking calibration, data integrity confirmation and track positioning.

Method of and apparatus for tracking appended data on storage medium

In a data storage system in which a sequence of data blocks is written onto a medium, appended data is distinguished by including in the first and subsequent appended data blocks an append point code uniquely identifying the location of the first appended data block. Where the data blocks have a running block number or frame number, the block or frame number of the first appended data block is stored as the append point code. This clearly identifies the most recent append point location which will aid in processes such as tracking calibration data integrity confirmation and track positioning.

A track format is prescribed so that an ST-AFN indicating the AFN of the streaming start position be written on each track, and at the time of reference value measurement, an append point is detected by monitoring coincidence between the AFT and the ST-AFN on the scanned track. And, on the basis of the detected append point, a reference value is measured for each streaming recorded area, and this reference value is held matched with the recording positional information of the streaming recorded area.

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Tokyo, Japan

Tomonao Uchida