Data destruction preventing method, recording apparatus provided with data destruction preventing capability, and disc recorded with guard band

• US 5,477,525 A
• Filed: 08/31/1993
• Issued: 12/19/1995
• Est. Priority Date: 09/03/1992
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Okabe, Masanobu
• Primary Examiner(s): Epps, Georgia Y.
• Assistant Examiner(s): CHU, KIM KWOK
• Application Number:
  US08/114,751
• Time in Patent Office: 840 Days
• Field of Search: 369/275.3, 369/58, 369/54, 369/56, 369/57, 369/59, 369/30, 395/275
• US Class Current: 369/30.1
• CPC Class Codes: G11B 11/10595 Control of operating function
• CPC Class Codes: G11B 19/02 Control of operating function, e.g. switching from recording to reproducing
• CPC Class Codes: G11B 19/04 Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
• CPC Class Codes: G11B 2220/2525 Magneto-optical [MO] discs
• CPC Class Codes: G11B 2220/2529 Mini-discs
• CPC Class Codes: G11B 2220/65 wherein solid state memory is used for storing indexing information or metadata
• CPC Class Codes: G11B 27/034 on discs G11B27/036, G11B27/038 take precedence
• CPC Class Codes: G11B 27/036 Insert-editing
• CPC Class Codes: G11B 27/11 by using information not detectable on the record carrier
• CPC Class Codes: G11B 27/19 by using information detectable on the record carrier
• CPC Class Codes: G11B 27/22 Means responsive to presence or absence of recorded information signals
• CPC Class Codes: G11B 27/24 by sensing features on the record carrier other than the transducing track ; sensing signals or marks recorded by another method than the main recording
• CPC Class Codes: G11B 27/329 on a disc [VTOC]
• CPC Class Codes: G11B 27/36 Monitoring, i.e. supervising the progress of recording or reproducing for digital recording G11B20/00 and s.gr.; for monitoring, testing or measuring of TV recorders of the type covered by H04N5/76 and subgroups, see H04N17/06
• CPC Class Codes: G11B 7/0045 Recording G11B7/006, G11B7/0065 take precedence
• CPC Class Codes: G11B 7/007 Arrangement of the information on the record carrier, e.g. form of tracks , actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
• CPC Class Codes: G11B 7/0946 specially adapted for operation during external perturbations not related to the carrier or servo beam, e.g. vibration

Abstract

A disc having recordable and recorded areas discretely scattered over it at the same time is formed with a guard band to prevent the recorded area from being destroyed by a track jump caused by an undue impact or vibration applied to the disc during a recording operation. Additionally, storing in memory information of an edge of a recorded area by a predetermined amount before recording, the edge providing a boundary between the recorded area and a recordable area, allows recovery of data in the recorded area destroyed by a track jump caused by an undue impact or vibration applied to a disc.

Claims

1. A recording apparatus for recording data onto a recording medium having at least one recordable area and at least one recorded area simultaneously, and a control table area, said recorded area and said recordable area including either one continuous segment respectively or a plurality of discrete segments respectively, said control table area managing a start address and an end address of said segment or each of said plurality of segments and link information for linking said plurality of segments if said recorded area and said recordable area include said plurality of segments, said recording apparatus comprising:

data reading means for reading the data from said recording medium;

storing means for storing said control table data read from said control table area by said data reading means;

recording start address calculating means for reading a start address indicating a start position of a recordable segment from said control table data stored in said storing means, and calculating a recording start address in accordance with said start address so as to provide a guard band between said start address and said recording start address for guarding the data of said recorded area; and

control means for recording data onto said recording medium based on said recording start address.

2. A recording apparatus as defined in claim 1, further comprises:

recordable segment length calculating means for obtaining a recordable segment length from a start address and an end address of one segment in a recordable area, these start and end addresses read from said control table area; and

comparing means for comparing said recordable segment length with said guard band length.

3. A recording apparatus as defined in claim 2, wherein said comparison between said recordable segment length and said guard band length set to a predetermined length is, if a recorded segment is disposed on a recordable segment at its front end and rear end respectively, to compare a length double said guard band length with said obtained recordable segment length.

4. A recording apparatus as defined in claim 2, wherein, if said recordable segment length is found smaller than said guard band length, a next recordable segment is reached by the link information in the control table to perform said predetermined arithmetic operation.

5. A recording apparatus for recording data onto a recording medium having at least one recordable area and at least one recorded area simultaneously, and a control table area, said recorded area and said recordable area including either one continuous segment respectively or a plurality of discrete segments respectively, said control table area managing a start address and an end address of said segment or each of said plurality of segments and link information for linking said plurality of segments if said recorded area and said recordable area include said plurality of segments, said recording apparatus comprising:

recording/reproducing means for recording data onto the recording medium and reproducing data from the recording medium;

storing means for storing recording data from an inputting means for a predetermined duration;

determining means for determining whether a segment adjacent to a segment of recordable area to be recorded is a recorded area; and

control means for controlling said recording/reproducing means and said storing means such that if said determining means determines said adjacent segment is a recorded area, said recording/reproducing means reproduces recorded data of said adjacent segment, said storing means stores said reproduced recorded data, and said recording/reproducing means records said recording data from said input means stored in said storing means to the segment of said recordable area when said recording/reproducing means has reached the start address of the segment of said recordable area.

6. A recording apparatus as defined in claim 5, wherein said control means suspends a data recording operation if a track jump is detected during recording data onto a recordable area and, if data in said recorded area adjacent to the recordable area is destroyed by the track jump, reads from said storing means the data in said recorded area previously stored in said storing means to recover the data in said destroyed recorded area by using said data read from said storing means.

7. A recording apparatus as defined in claim 5, wherein, if said recorded area is located before said recordable area, data is read from said recorded area in a portion between a predetermined location near a trailing end of said recorded area and the trailing end to be stored in said storing means.

8. A recording apparatus as defined in claim 7, wherein, if data in said recorded area adjacent to a recordable area has been destroyed by a track jump, said control means reads the data of said recorded area previously stored in said storing means to record the data from the start address of said recordable area and subsequently record the entered recording data stored in said storing means.

9. A recording apparatus as defined in claim 8, wherein, if a recording operation for recovering the data in said destroyed recorded area has been executed, said control means registers in a control table the recorded area on the recording medium in which the data stored in said storing means was originally recorded as a recordable area.

10. A recording apparatus as defined in claim 5, wherein, if said recorded area is located after said recordable area, data is read from said recorded area in a portion between a beginning of said recorded area and a predetermined location away from the beginning to be stored in said storing means.

11. A recording apparatus as defined in claim 5, wherein, if said recorded area is located before and after said recordable area respectively, both the data between the predetermined location near the trailing end of said recorded area before said recordable area and the trailing end and the data between the beginning of the said recorded area after said recordable area and the predetermined location away from the beginning are read to be stored in said storing means.

12. A re-recording method for an apparatus for recording data onto a recording medium having at least one recordable area and least one recorded area simultaneously, and a control table area, said recorded area and said recordable area including either one continuous segment respectively or a plurality of discrete segments respectively, said control table area managing a start address and an end address of said segment or each of said plurality of segments and link information for linking said plurality of segments if said recorded area said recordable area include said plurality of segments, said method comprising the steps of:

searching the recording medium for a recordable area based on data of said control table area;

extracting a start address and an end address of a detected recordable area from the data of said control table area;

calculating at least one of a recording start address and a recording end address of the detected recordable area based on the extracted address data and a predetermined guard band length; and

controlling a recording operation based on a result of said calculation.

13. A re-recording method as defined in claim 12, wherein the step of executing said predetermined arithmetic operation further comprises the steps of:

determining whether one of areas adjacent to said recordable area is a recorded area;

calculating, if one of the adjacent areas has been determined to be a recorded area, a segment length based on the start address and the end address of said detected recordable area to compare said predetermined guard band length with said segment length;

determining, if said segment length has been found greater than said guard band length, whether the area before said recordable area is a recorded area;

adding, if said area before said recordable area has been determined to be a recorded area, said start address to said guard band length to store a result of said addition as a recording start address; and

controlling a recording start operation based on said recording start address.

14. A re-recording method as defined in claim 12, wherein said step of executing a predetermined arithmetic operation further comprises the steps of:

determining whether one of areas adjacent to said recordable area is a recorded area;

calculating, if one of the adjacent areas has been determined to be a recorded area, a segment length based on the start address and the end address of said detected recordable area to compare said predetermined guard band length with said segment length;

determining, if said segment length has been found greater than said guard band length, whether the area after said recordable area is a recorded area;

subtracting, if said area after said recordable area has been determined to be a recorded area, said guard band length from said end address to store a result of said subtraction as a recording end address; and

controlling a recording suspending operation based on said recording end address.

15. A re-recording method according to claim 12, wherein said step of executing a predetermined arithmetic operation further comprises the steps of:

determining whether areas adjacent to said recordable area are recorded areas;

calculating, if both of the adjacent areas have been determined to be recorded areas, a segment length based on the start address and the end address of said detected recordable area to compare double said predetermined guard band length with said segment length;

adding, if said segment length has been found greater than double said guard band length, said start address to said guard band length to store a result of said addition as a recording start address and subtracting said guard band length from said end address to store a result of said subtraction as a recording end address; and

controlling a recording operation based on said recording start address and said recording end address.

16. A re-recording method as defined in claim 12, wherein a method for controlling a track jump caused during a recording operation comprises the steps of:

determining whether a number of tracks jumped is greater than a predetermined number of tracks;

suspending the recording operation if the number of tracks jumped has been found greater than the predetermined number of tracks;

storing absolute-position information of a destination of the track jump;

determining whether the track jump has taken place toward an inner peripheral of the recording medium;

calculating, if the track jump has been found taking place toward the inner peripheral, a recording unit containing an absolute position immediately before said stored absolute-position information of the track jump destination;

determining whether data ranging from said calculated recording unit to a recording unit before the track jump remains in storing means; and

executing, if said data has been found remaining in said storing means, a recording operation by using said calculated recording unit as a re-recording start address.

17. A re-recording method for an apparatus for recording data onto a recording medium having at least one recordable area and at least one recorded area simultaneously, and a control table area, said recorded area and said recordable area including either one continuous segment respectively or a plurality of discrete segments respectively, said control table area managing a start address and an end address of said segment or each of said plurality of segments and link information for linking said plurality of segments if said recorded area and said recordable area include said plurality of segments, said method comprising the steps of:

setting a writing start address and a writing end address of a recordable area on the recording medium based on said control table data which is recorded on said control table area;

determining whether an area before said writing start address is a recorded area;

subtracting writing start address has been determined a predetermined length from said writing start address and storing a result of said subtraction as a past data reading start address for reading data of a predetermined length from said recorded area only if the area before said writing start address has been determined to be a recorded area;

positioning an optical pickup to said past data reading start address;

setting a past data reading end address to said writing start address;

writing data into storing means based on said past data reading start address and said past data reading end address; and

storing inputted data into said storing means and writing the inputted data from said storing means to the recordable area when said past data reading end address has been reached.

18. A re-recording method as defined in claim 17, further comprising the steps of:

detecting whether a track jump has taken place during a recording operation;

suspending, if the track jump has been detected, the recording operation;

storing an address immediately after the track jump;

determining whether the track jump has taken place toward an inner peripheral of the recording medium;

calculating, if the track jump has been found taking place toward the inner peripheral, a recording unit containing an address immediately before said stored address immediately after the track jump to store the calculated recording unit as a rewriting address;

comparing said rewriting address with said past data end address; and

determining, if said rewriting address has been found smaller than said past data end address, that a data destruction has taken place to set said past data start address to a rewriting start address to record the past data stored in said storing means.

19. A re-recording method as defined in claim 17, still further comprising the steps of:

detecting whether a track jump has taken place during a recording operation;

suspending, if the track jump has been detected, the recording operation;

storing an address immediately after the track jump;

determining whether the track jump has taken place toward an inner peripheral of the recording medium;

calculating, if the track jump has been found taking place toward the inner peripheral, a recording unit containing an address immediately before said stored address immediately after the track jump to store the calculated recording unit as a rewriting address;

comparing said rewriting address with said past data end address; and

determining, if said rewriting address has been found smaller than said past data end address, that a data destruction has taken place to set a rewriting start address to a writing start address of the recordable area to record the past data stored in said storing means.

20. A recording medium having at least one recordable area and at least one recorded area simultaneously, and a control table area, said recorded area and said recordable area including a plurality of discrete segments respectively, said control table area managing a start address and an end address of said segment or each of said plurality of segments and link information for linking said plurality of segments if said recorded area and said recordable area include said plurality of segments, said recording medium provided with a write-protected guard band of a predetermined length in said recordable area at a portion thereof adjacent to said recorded area.

21. A recording medium as defined in claim 20, wherein said write-protected guard band is provided in said recordable area at any one of an front end, an rear end, and both ends thereof respectively.