Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1994-10-13
1997-06-17
Epps, Georgia Y.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 48, 369 54, G11B 700
Patent
active
056403780
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a disc recording apparatus in which data is formed in clusters and recorded on a disc on a cluster basis.
BACKGROUND ART
In a disc adapted for recording interleaved data thereon, data formed into clusters are recorded on the cluster basis in order to take data rewriting into account, as disclosed in, for example, JP Patent Kokai Publication No. 4-105271 or No. 4-301264.
As shown for example in FIG. 1, each cluster is constituted by a link sector and a data sector, and the length of the link sector is selected to be longer than an interleaving length. In this manner, each cluster is not affected by interleaving from neighboring clusters and recording and/or reproduction may be made independently on the cluster basis.
That is, with a disc on which data recorded thereon is interleaved data, data is recorded across plural sectors, without data being present independently on the sector basis. Consequently, rewriting of a particular sector cannot be performed by one operation and rewriting is to be performed on the cluster basis.
Meanwhile, in a disc recording apparatus in which data is grouped into clusters and recorded on the cluster basis, if data of the last cluster of main data for a writing 1 (first writing) is short of one full cluster, the portion of the cluster devoid of data is stuffed with void data to form one-cluster data and main data for the next writing 2 (second writing) is started with the next cluster. This indicates that a wasteful recording area 10 is produced as a result of stuffing the data free portion with void data.
Also, when rewriting data on the sector basis, data of the sector which belongs to the cluster to be rewritten and which is not rewritten has to be previously read out and combined with data which is to be rewritten and which is held on a random access memory. However, data readout needs to be made each time rewriting on the sector basis is performed, resulting in increased overhead until completion of recording.
In view of the above-described problems of the prior art, it is an object of the present invention to provide a disc recording apparatus in which the recording capacity of the disc may be fully utilized in carrying out recording, and in which accessing may be made expeditiously.
DISCLOSURE OF THE INVENTION
The present invention provides a disc recording apparatus for forming recording data into a cluster and recording the recording on a disc on the cluster basis. If, recording data supplied from the outside via input means is transiently stored in a memory and recorded by recording means on the disc, the recording data supplied from outside by one transfer operation has a data volume short of one cluster, the recording operation is suspended for transiently storing the data of the data volume less than one cluster in the memory. The deficit data is added to the data having the data volume less than one cluster on the memory during recording of the recording data having the data volume less than one cluster, in order to form one-cluster data. The recording data having the data volume corresponding to one cluster is supplied to the recording means and recorded on the cluster basis on the disc. With the disc recording apparatus of the present invention, there is no wasteful recording region produced even for writing a file next to the file completed in the midst of a cluster, thereby assuring recording which makes full utilization of the disc recording capacity.
According to the present invention, the control means causes one cluster data supplied from the memory to the recording means to be held on the memory after the data has been supplied to the recording means. Thus, with the disc recording apparatus of the present invention, efficient data accessing may be assured by decreasing the number of wasteful accessing operations.
According to the present invention, the control means controls the memory for supplying one-cluster recording data to the recording means each time the detection means detects that the recording d
REFERENCES:
patent: 5243588 (1993-09-01), Maeda et al.
patent: 5453967 (1995-09-01), Aramaki et al.
Arai Kiyoshi
Furukawa Takashi
Epps Georgia Y.
Huber P. W.
Sony Corporation
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