Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2001-02-28
2002-05-28
Young, W. R. (Department: 2653)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S047140, C369S053170
Reexamination Certificate
active
06396786
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of Korean Application No. 80543/1997, filed Dec. 31, 1997, in the Korean Patent Office, the disclosure of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a DVD-RAM (Digital Video Disk-Random Access Memory) system, and in particular, to a method of processing the data of a defect sector referring to a defect list having physical defect information on a disk.
2. Description of the Related Art
In general, a disk has defect areas unavailable for recording data due to physical causes in a DVD-RAM system. Such defect areas are empty of data and their smallest unit is a data sector. A sector in a defect area is called a defect sector, and the information of the defect sector is generally stored in a lead-in area of a DVD-RAM disk.
FIG. 1
illustrates a data format for a general DVD-RAM disk, with a physical sector address preceding data to be error-corrected.
Since the information of a defect sector in the lead-in area is stored in an additional defect information memory, it is determined whether a physical sector address for each sector data indicates a defect sector referring to a defect list having the information of defect sector data in the defect information memory when the physical sector address shown in
FIG. 1
is read during a playback of the DVD-RAM disk in the DVD-RAM system. If the physical sector address does not indicate a defect sector, the data following the physical sector address is stored in an error correction memory and subjected to error correction.
FIG. 2
is a block diagram of a signal processing portion
236
in the general DVD-RAM system to which the present invention is applied. Referring to
FIG. 2
, a memory
224
serves as an error correction memory and stores data in 16 data sector units. A microcomputer interface
226
interfaces data transmitted between components of the signal processing portion
236
. A microcomputer
228
controls the entire operation of the signal processing portion
236
as well as that of the DVD-RAM system.
When reproducing a disk
200
, a disk motor
204
starts to rotate at a constant linear velocity, and an optical pickup
202
including a head converts disk information to an analog high frequency signal. The analog high frequency signal is converted to a pulse wave signal and a data stream EFM is applied to a 32-bit shift register
206
. The lower 16 bits of 32 bits output from the 32-bit shift register
206
are provided to a 16-to-8 demodulator
208
. The 16-to-8 demodulator
208
converts the received 16-bit data to 8-bit data as one symbol because data was 8-to-16 modulated during recording.
A physical sector address detector
230
detects a physical sector address from the data received from the 16-to-8 demodulator
208
. A physical sector address error corrector
234
corrects errors of the physical address received from the physical sector address detector
230
. A data address detector/error corrector
232
detects a data address from the data received from the 16-to-8 demodulator
208
and corrects errors of the data address. A sync detector
210
detects various sync patterns like a frame sync signal being a standard signal for controlling the rotation of the disk
200
, a sector sync signal for differentiating sectors, and an error correction sync signal for reading the data of a corresponding error correction block by finding out an error correction time point, and generates sync signals.
A descrambler
214
descrambles scrambled data recorded on the DVD to return the scrambled data to the state prior to scrambling. An error detector
216
detects errors from the data received from the descrambler
214
. A deinterleaves
218
deinterleaves data interleaved in frame units to return the data to its original arranged state by controlling a write/read address of the memory
224
. An ATAPI (AT Attachment Packet Interface) interface
222
interfaces data between the signal processing portion
236
and a computer. AN ATAPI buffer memory
238
temporarily buffers the data interfaced between the computer and the signal processing portion
236
. A memory controller
220
stores data read from the disk
200
in the memory
224
in 16 sector units. An error corrector
212
corrects errors of a predetermined block having data read from the disk. A defect information memory
240
stores a defect list having information of defect sectors read from the lead-in area of the disk
200
.
As shown in
FIG. 2
, the defect information memory is additionally provided in the prior art to store the defect sector information, thereby requiring an additional memory access means for controlling the defect information memory and increasing the number of memories.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a method for processing the data of a defect sector, which can reduce the number of memories by storing a defect list in a predetermined area of a memory of a conventional DVD-RAM system.
Additional objects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
To achieve the above and other objects and advantages, there is provided a method for processing the data of a defect sector in a DVD-RAM system. In the method, a defect list is read from a lead-in area of a DVD-RAM disk during playback of the disk and stored in a predetermined area of a memory of a signal processing portion in the system. A sector having the title of a user-input file is searched, a physical sector address for the searched sector is designated, the defect list is read, and it is determined whether the physical sector address is in the defect list. Then, sector data corresponding to the physical sector address is stored in the memory of the signal processing portion if the physical sector address is not in the defect list, and otherwise, no sector data corresponding to the physical sector address is stored in the memory.
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Samsung Electronics Co,. Ltd.
Staas & Halsey , LLP
Young W. R.
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