EP0448378A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Information recording and reproducing device
Assignee: Sharp Corp
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Filing: 1991-03-20
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Granted: —
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Expires: 2011-03-20
Abstract
Abstract An information recording and reproducing device uses a recording medium which is provided with units composed of blocks and a unit information recording area containing: unit allocation information; sector number information indicating the number of sectors per unit; and unit number information identifying each unit. When the recording medium is placed in the device, the respective information is read by a calculating unit and is used for calculating physical sector numbers corresponding to a block specified in recording and reproduction operations. Access operations are performed to the calculated sectors, which allows the desired information to be recorded. The block includes dummy sectors which are added before and after each group of predetermined numbers of effective sectors. When high-volume information is recorded over several blocks, the dummy sectors may be provided only for the first and last blocks. The device records a group of information whose volume varies from the smallest block number toward the larger block numbers, while it records a group of information whose volume is fixed from the largest block number. Thus, the recording area is effectively used. The device easily conducts the information management when a host device specifies a block. The file management may be executed by providing a unit for recording file management information separately from a unit for recording files.
Inventors
- 👤 Shigemi Maeda
- 👤 Kunio Kojima
- 👤 Kazuaki Okumura
- 👤 Shigeo Terashima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 08:59
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/06; G06F3/0601; G11; G11B; G11B7/00; G11B7/007; G06F3/0602; G06F3/061; G06F3/0613; G06F3/0628; G06F3/0638; G06F3/064; G06F3/0643; G06F3/0668; G06F3/0671; G06F3/0673; G06F3/0674; G06F3/0677; G11B20/00; G11B20/10; G11B20/12; G11B20/1217; G11B20/1254; G11B27/00; G11B27/02; G11B27/031; G11B27/036; G11B27/10; G11B27/102; G11B27/105; G11B27/11; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B27/3063; G11B27/32; G11B27/327; G11B27/329; G11B7/00745; G11B7/08; G11B7/085; G11B7/08505; G11B20/10527; G11B2020/10537; G11B2020/10546; G11B2220/00; G11B2220/20; G11B2220/21; G11B2220/215; G11B2220/218; G11B2220/25; G11B2220/2525; G11B2220/2537; G11B2220/2545; G11B2220/60; G11B2220/65; G11B2220/90; G11B27/034; Y; Y10; Y10S; Y10S707/00; Y10S707/99951; Y10S707/99952; Y10S707/99953; Y10S707/99956
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
178 words
An information recording and reproducing device for recording and reproducing information in a recordable type recording medium block by block, wherein each block which is the minimum recording unit is composed of predetermined numbers of sectors and the sectors as recording areas are provided with physical sector numbers identifying each sector according to prerecorded absolute address information, comprising: recording means for recording information in the recording medium; and processing means for: i) recording allocation information of units composed of collections of the blocks and sector number information indicating the number of sectors per block in each unit in said unit information recording area of the recording medium by the use of the recording means, the allocation information and the sector number informing being given by a host device; ii) calculating physical sectors corresponding to the blocks of a unit specified by the host device in recording and reproducing operations by reading the information recorded in the unit information recording area when the recording medium is loaded; and iii) directing the recording means to access to the physical sectors.
Claim 2
Dependent Claim
63 words
An information recording and reproducing device as defined in claim 1, wherein the recording medium is provided with units composed of collections of the blocks and the number of sectors composing the block is arranged so that various types of information can be allocated to blocks composed of the optimum numbers of the sectors according to the data lengths of the respective information.
Claim 3
Dependent Claim
103 words
An information recording and reproducing device as defined in claim 2, wherein the recording medium is disc in shape and the unit is arranged such that block size Bs can meet ((m x n) - 0.5 m) < Bs < (m x n) where m is the number of sectors in one disk rotation in the innermost of each unit and n is the number of tracks in one block so that the time required for starting a reproducing operation for verification after completing the recording operation and a track jump becomes substantially constant independently of any radius location of the recording medium.
Claim 4
Dependent Claim
205 words
An information recording and reproducing device for performing the recording and reproducing operations of information in a recordable type recording medium by block by block, wherein each block which is the minimum recording unit is composed of predetermined numbers of sectors and the sectors as recording areas are provided with physical sector numbers identifying each sector according to prerecorded absolute address information, comprising: storing means; processing means for recording allocation information of units composed of collections of the blocks on the recording medium and sector number information indicating the number of sectors composing a single block in each unit in the storing means; sub-code information generation means for generating sub-code information to specify the number of main information and sector numbers concerning recording start positions of the main information according to an output of the storing means; recorded signal processing means for adding error detection and correction parity and the sub-code information to information to be recorded which is input from a host device, and for releasing signals which are modulated based on an EFM method and to which frame synchronization signals are added; and recording means for recording the information in the recording medium according to an output of the recorded signal processing means.
Claim 5
Dependent Claim
101 words
An information recording and reproducing device as defined in claim 4, further comprising: reproduced signal processing means for outputting to the host device reproduced signal data which is obtained after the reproduced signals go through the EFM demodulation process and an error detection and correction process using the error correction and detection parity; and sub-code detection means for detecting the sub-code information from the EFM-demodulated reproduced signal, wherein the processing means selects an output of the sub-code detection means, stores/reads it in the storing means and stores/reads information which is related to the contents of TOC sent from the host device.
Claim 6
Dependent Claim
35 words
An information recording and reproducing device as defined in claim 1, further comprising: file management means for managing files by providing a unit for recording file management information separately from a unit for recording files.
Claim 7
Dependent Claim
48 words
An information recording and reproducing device as defined in claim 6, wherein the file management information is equal to directory and File Allocation Table (FAT), and track numbers and block numbers are included and recorded in the directory while block numbers are recorded in order in the FAT.
Claim 8
Dependent Claim
112 words
An information recording and reproducing device for recording a group of information whose volume is fixed and a group of information whose volume varies together in a rewritable type recording medium on which blocks are provided and numbered from an edge outward of the recording medium, comprising: recording control means for controlling the group of information whose volume is fixed to be recorded from the largest block number toward the smaller block numbers and the group of information whose volume varies to be recorded from the smallest block number toward the larger block numbers so that blank areas where neither of the group of information is recorded are presented in one location.
Claim 9
Dependent Claim
195 words
An information recording and reproducing device for recording and reproducing information in a recordable type recording medium, whose recording areas are provided with physical sector numbers according to prerecorded addresses, based on the non-completed interleaving method, comprising: calculating means for calculating the physical sector numbers according to a block number where the information is recorded or reproduced block by block; recording control means for recording the information in the physical sectors calculated by the calculating means by dividing the information by n numbers of effective sectors, generating and adding front additional data and rear additional data respectively in front of and behind the front and rear additional sectors for each information recorded in the respective effective sectors if the information is discrete information, and for recording information successively in the physical sectors if the information is successive information, wherein each block is composed of ( n + n₁ + n₂ ) numbers of the sectors, a group of n numbers of the effective sectors and n₁ numbers of the front additional sectors are added in front of each group of the effective sectors and n₂ numbers of the rear additional sectors are added behind thereto.
Claim 10
Dependent Claim
188 words
An information recording and reproducing device for recording and reproducing information in a recordable type recording medium, whose recording areas are provided with physical sector numbers according to prerecorded addresses, based on the non-completed interleaving method, comprising: calculating means for calculating physical sector numbers according to a block number where the information is recorded or reproduced by the block unit, wherein each block is composed of (n + n₁ + n₂) numbers of the sectors; and recording control means for recording the information by generating and adding front additional data to the front additional sectors of each block and rear additional data to the rear additional sectors thereof when recording low-volume information or information whose data lengths are not fixed, and for adding the front additional data only to n₁ numbers of the front additional sectors of the first block and the rear additional data only to n₂ numbers of the rear additional sectors of the last block when high-volume information is successively recorded over a plurality of blocks so that the information is successively recorded in sectors between the front additional sectors and the rear additional sectors.
Claim 11
Dependent Claim
48 words
An information recording and reproducing device as defined in claim 10, further comprising: switching circuit means; and sector data generation circuit means for generating the additional data, wherein the additional data is added to information to be recorded when the recording control means switches the switching circuit means.
Claim 12
Independent Claim
68 words
A method for recording high-volume information over several blocks, comprising the steps of: determining the sector number of the first sector of a block where the information is instructed to be recorded; accessing to the determined sector number, recording front additional data therein and recording the information successively in the following sectors; and recording rear additional data in the last block after completing the recording of the information.
Claim 13
Independent Claim
63 words
A method for recording low-volume information in each block, comprising the steps of: determining the sector number of the first sector of a block where the information is instructed to be recorded; accessing to the determined sector number, recording front additional data therein and recording the information to the following sectors; and recording rear additional data after completing the recording of the information.
Claim 14
Dependent Claim
71 words
An information recording and reproducing device as defined in claim 1, wherein the recordable recording medium is a rewritable type recording medium, the capacity of the unit can be easily changed by erasing information unit by unit, and the number of sectors in one block in each unit can be rearranged to become larger from inside outward of the recording medium, so that a single recording medium can be used efficiently.
References Cited (Backward Citations)
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