Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2000-11-08
2003-08-26
Hindi, Nabil (Department: 2651)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S053150
Reexamination Certificate
active
06611483
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rewritable optical recording medium system, and more particularly, to device and method for recording data on a rewritable optical recording medium.
2. Background of the Related Art
In general, there are rewritable compact disc(CD-RW) and rewritable digital versatile disc(DVD-RW, DVD-RAM, DVD+RW) in optical recording mediums, particularly, in optical disks, which are rewritable freely and repetitively. In those rewritable optical disks, information writing/reading thereto/therefrom are made repetitively as the nature of use of the optical disk is. The repetitive write/read of information causes a change of a mixing ratio of a recording layer mixture provided for recording the information from an initial mixing ratio, which leads to lose initial properties of the mixture, that causes an error occurred in writing/reading information, which is called degradation. Areas of the degradation are turned up as defective areas when formatting, or write or read command for the optical disk is carried out. Other than the degradation, defective areas on the rewritable optical disk are caused by scratch on a surface, dusts, and/or from production defects. Therefore, in order to prevent writing/reading data to/from the defective areas formed by the foregoing causes, management of the defective areas is required. To do this, as shown in
FIG. 1
, DMAs(Defect Management Areas) are provided in lead-in areas and in lead-out areas of the optical recording medium for managing the defective areas on the optical recording medium. And, data areas are managed in zones, each having a user area for use in actual writing of data and a spare area for use in a case of defect occurrence in the user area. Or alternatively, the spare area may be assigned to a portion of the data area, i.e., to top or bottom. In general, there are four DMAs provided in one disk(for example, a DVD-RAM), two in the lead-in area and the other two in the lead-out area. As management of the DMAs are important, the same data is repeatedly written in the four DMAs for protection of data. Each DMA has two blocks having 32 sectors in total, i.e., one block has 16 sectors. A first block of each DMA(called as DDS/PDL block) includes a DDS(Disk Definition Structure) and a PDL(Primary Defect List), and a second block(called as SDL block) of each DMA includes an SDL(Secondary Defect List). The PDL is a primary defective data storage portion and the SDL is a secondary defective data storage portion. In general, the PDL is in storage of entries of defects occurred in a disk fabrication process and all defective sectors identified in formatting, i.e., initializing and re-initializing, of the disk. Each entry has an entry type and a sector number corresponding to a defective sector. On the other hand, the SDL, listed in block units, is in storage of entries of defective areas occurred after the formatting, or defective areas which can not be stored in the PDL during the formatting. Each SDL entry has one area in storage of a sector number of a first sector in a block having a defective sector occurred therein and the other area in storage of a sector number of a first sector in a spare block which will replace the defective block. The defective areas(i.e., defective sectors or defective blocks) in the data area are replaced with good areas, according to a slipping replacement algorithm or linear replacement algorithm.
Referring to
FIG. 2A
, in the slipping replacement which is applicable to a case when a defective area is listed on the PDL, if the defective sector listed on the PDL is present in the user area on which an actual data is to be written, the defective sector is skipped, and instead, the defective sector is replaced with a good sector next to the defective sector in writing a data. Consequently, the user area on which the data is being written is pushed backward, to occupy the spare area as much as the skipped defective sector, at the end.
And, referring to
FIG. 2B
, in the linear replacement which is applicable to a case when a defective area is listed on the SDL, if there is a defective block listed on the SDL present in the user area or in the spare area, the defective block is replaced with block units of replacement areas assigned to the spare area in writing the data. In this instance, though a PSN(Physical Sector Number) assigned to the defective block is not changed, an LSN(Logical Sector Number) is transferred to the replacement block, together with the data. This linear replacement is effective in non-realtime writing/reading a data.
FIG. 3
illustrates a block diagram showing one example of a related art rewritable optical recording disk recording/reproduction device, provided with an optical disk
301
, an optical pickup
302
, a RF and servo error generating part
303
, a data processing part
304
, an interface
305
, a servo controller
306
, a focus servo driver
307
, a tracking servo driver
308
, and a microcomputer
309
for controlling the above components. There is a host
100
connected to the interface
305
of the optical disk recording/reproducing medium for exchange of commands and data. In this instance, the host
100
, one of PC(Personal Computer), supports the optical disk recording/reproducing device.
A signal track of the foregoing optical disk
301
in
FIG. 3
has a land and a groove, wherein data can be recorded/reproduce, not only on the land or in the groove, but also on both of the land and the groove. In this instance, under the control of the servo controller
306
, the optical pick up directs an optical beam focused by an objective lens to the signal track of the optical disk
301
, and an optical beam reflected at a signal recording surface to an optical detector(not shown) for detecting a focus error and a tracking error after focusing the optical beam to the objective lens, again. The optical detector has a plurality of optical detecting elements, each for providing an electric signal proportional to an amount of light incident thereto to the RF and servo error generating part
303
, which combines the electric signals to produce a RF signal required for reproduction of a data, and a tracking error signal TE and a focus error signal FE, both required for servo control, and the like. The RF signal is provided to the data processing part
304
for reproduction, and servo error signals, such as FE and TE, are provided to the servo controller
306
. The data processing part
304
encodes a data to be written into a recording pulses required by the optical disk
301
and provides to the optical pickup
302
, or restores the RF signal into an original data. The servo controller
306
processes the focus error signal FE to provide a driving signal to the focus servo driver
307
, and processes the tracking error signal TE to provide a driving signal to the tracking servo driver
308
for tracking control. The focus servo driver
307
drives a focus actuator in the optical pickup to move the optical pickup in up and down directions, for following up the optical disk as the optical disk turns. The tracking servo driver
308
. The tracking servo driver
308
drives a tracking actuator in the optical pickup
302
to move the optical pickup
302
in a radial direction, for correcting a position of the beam, to follow up a required track. In the meantime, the host
100
transfers recording/reproduction command to the microcomputer
309
through the interface
305
, data to be written to the data processing part
304
, and receives a reproduced data. The microcomputer
309
controls the data processing part
304
, the interface
305
and the servo controller
306
in response to the write/read command from the host. That is, provided that a data to be written is occurred, the host
100
transfers the data to be written to the optical disk recording/reproducing device, together with a write command. The data to be written may be an A/V data(for example, a movie and the like) requiring a real time recording, o
Jeong Kyu Hwa
Lee Han Sang
Park Yong Cheol
Shin Jong In
Birch & Stewart Kolasch & Birch, LLP
Hindi Nabil
LG Electronics Inc.
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