Optical storage medium in which sector address information is recorded using MSR techniques
AssigneeFujitsu Limited
InventorYoshiyuki Nanba
Life of this patent
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Abstract
A storage medium stores information on a plurality of tracks formed thereon, each of the tracks being divided into a plurality of sectors. The storage medium includes a physically formed sector beginning identifier provided at a leading portion of each sector, and an information storing portion. The information storing portion, another sector address portion at the trailing end of the information storing portion, includes at least one sector address portion at a leading end of the information storing portion, another sector address portion at the trailing end of the information storing portion, and a data portion provided between the two sector address portions.
Claims11
A storage medium for storing information on a plurality of tracks formed thereon, each of the tracks being divided into a plurality of sectors, said optical storage medium comprising:
- a physically formed sector beginning identifier provided at a leading portion of each said sector;
- and
- an information storing portion including:
- at least one sector address portion provided at a leading end of said information storing portion and storing a sector address, and
- a data portion provided after said sector address portion and storing user data.
A method for detecting an off track condition of a head reproducing information from a given sector of a storage medium, wherein each sector includes a first sector address portion provided at a leading end of a data portion and a second sector address portion provided at a trailing end of the data portion, said method comprising the steps of:
- reading a sector of information, including the first and second sector addresses and the data;
- and
- comparing the first and second sector addresses;
- wherein an off track condition of the head is determined if the first sector address does not match the second sector address.
A method of correcting a misread sector address recorded on a storage medium, wherein the storage medium stores data in a plurality of sectors, each sector storing at least a sector address, data, a CRC byte and an error correction code (ECC) which is determined as a function of the sector address and data, said method comprising the steps of:
- reading a sector of information, including the sector address, the data and the ECC code;
- determining whether the sector address has been correctly read using the CRC byte, and if necessary, correcting/reconstructing the sector address using the ECC.
A method of recording and retrieving information from/to a recording medium partitioned into plural sectors, where each sector includes a start section identifier at the leading end of each sector, followed by a data portion, a first sector address portion being provided at a leading end of the data portion, and a second sector address portion being provided at a trailing end of the data portion, each of the first and second address portions storing a sector address of the sector, said method comprising the steps of:
- writing data to a target sector in a target track;
- and
- verifying that the head was positioned over the target sector during said writing step using the first and second sector address portions of the target sector.
A storage device which records/reproduces information to/from an optical storage medium using a light beam, the storage medium including plural tracks, each track being divided into plural sectors, wherein information is recorded/reproduced on a sector by sector basis, said optical storage device comprising:
- a recording and retrieving portion which records/retrieves a sector of information from said optical storage medium including a sector address and data;
- said recording and retrieving portion writing sector addresses and data to each sector of said optical storage medium when recording data, and detecting an intended sector when retrieving data by reading the sector addresses;
- wherein said recording and retrieving portion includes an error detecting portion which detects errors by comparing a sector address read from a leading end of a given sector with a sector address read from a trailing end of the given sector.
Dependencies are inferred from the claim text.