Information recording and reproducing apparatus

• US 20060230325A1
• Filed: 04/05/2006
• Published: 10/12/2006
• Est. Priority Date: 04/07/2005
• Status: Abandoned Application

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Motohashi, Tsutomu
• Application Number:
  US11/397,629
• Publication Number:
  US 20060230325A1
• Time in Patent Office: Days
• US Class Current: 714/710
• CPC Class Codes: G11B 20/1217 on discs
• CPC Class Codes: G11B 20/1883 Methods for assignment of alternate areas for defective areas
• CPC Class Codes: G11B 2020/1277 for managing gaps between two recordings, e.g. control data in linking areas, run-in or run-out fields, guard or buffer zones
• CPC Class Codes: G11B 2020/1893 using linear replacement to relocate data from a defective block to a non-contiguous spare area, e.g. with a secondary defect list [SDL]
• CPC Class Codes: G11B 2220/20 Disc-shaped record carriers
• CPC Class Codes: G11B 2220/216 Rewritable discs
• CPC Class Codes: G11B 2220/237 having exactly two recording layers
• CPC Class Codes: G11B 2220/2562 DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs

Abstract

An information recording and reproducing apparatus is disclosed. When a dual layer DVD disk is to be ejected before formatting is completed, the information recording and reproducing apparatus provides a middle area adjacent to a formatted area of the first recording layer, a middle area in the second recording layer at a position corresponding to the middle area of the first recording layer, and a dummy data area in the second recording layer at a position corresponding to the formatted area of the first recording layer. The areas outside of the middle areas are left blank.

Claims

1. An information recording and reproducing apparatus, comprising:

a reading and writing unit for reading and writing information in a recording medium that has a plurality of recording layers which layers are shaped like a disk, wherein a spare area is assigned to an inner circumference area of each of the recording layers for substituting for a defective area.

2. The information recording and reproducing apparatus as claimed in claim 1, wherein

a size of the spare area of one of the recording layers is different from the size of the spare area of another of the recording layers.

3. The information recording and reproducing apparatus as claimed in claim 1, wherein

an arrangement position of the spare area of one of the recording layers is different from an arrangement position of the spare area of another of the recording layers.

4. An information recording and reproducing apparatus, comprising:

a reading and writing unit for reading and writing information in a recording medium that has a plurality of recording layers which layers are shaped like a disk, wherein a spare area for substituting for a defective area is provided on a side where recording is started.