US5068842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control method of disk drive for recordable optical disk
Assignee: Pioneer Corp
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Filing: 1988-11-07
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Granted: 1991-11-26
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Expires: 2008-11-07
Abstract
Abstract A control method of a disk drive for a recordable optical disk whose information storage area is divided into plural bands and comprises first sectors for recording user data and third sectors for recording defect management this information represents addresses of the defect first sectors and corresponding second sectors. The control method includes the steps of receiving a command to get access to an indicated address, reading out the latest defect management information in the band including a sector of the indicated address, and storing the latest defect management information on a memory in the disk drive.
Inventors
- 👤 Ryuuich Naito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:16
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G11B20/1883; G11B19/00; G11B19/02; G11B19/04; G11B27/00; G11B27/10; G11B27/102; G11B27/105; G11B27/11; G11B2020/1873; G11B2220/00; G11B2220/20; G11B2220/21; G11B2220/215; G11B2220/218; G11B2220/60; G11B2220/65
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
205 words
A method for controlling a disk drive for a recordable optical disk whose information storage area is divided into plurality of bands, each band comprising multiple user sectors for recording user data, multiple alternative sectors for recording said user data when said user sectors are defective, and multiple mapping sectors for recording mapping data, said control method comprising the steps of: receiving a command to access a chosen sector of said multiple user sectors, determining whether a memory location in a memory of said disk drive has stored therein mapping data read from a mapping sector for the band that includes said chosen sector, reading mapping data from the most recently recorded mapping sector for said corresponding band, if said mapping data from said mapping sector has not been previously stored in said memory location, thereby accessing each band's most recently recorded mapping data only as user sectors within said band are chosen, storing the mapping data read from said most recently recorded mapping sector within said disk drive at said memory location, and accessing said chosen sector or an alternate sector defined by said mapping data, depending on whether said mapping data identifies said chosen sector as having no defect or a defect, respectively.
Claim 2
Independent Claim
205 words
A method for controlling a disk drive for a recordable optical disk whose information storage area is divided into plurality of bands, each band comprising multiple user sectors for recording user data, multiple alternative sectors for recording said user data when said user sectors are defective, and multiple mapping sectors for recording mapping data, said control method comprising the steps of: receiving a command to access a chosen sector of said multiple user sectors, determining whether a memory location in a memory of said disk drive has stored therein mapping data read from a mapping sector for the band that includes said chosen sector, reading mapping data from the most recently recorded mapping sector for said corresponding band, if said mapping data from said mapping sector has not been previously stored in said memory location, thereby accessing each band's most recently recorded mapping data only as user sectors within said band are chosen, storing the mapping data read from said most recently recorded mapping sector within said disk drive at said memory location, and accessing said chosen sector or an alternate sector defined by said mapping data, depending on whether said mapping data identifies said chosen sector as having no defect or a defect, respectively.
Claim 3
Dependent Claim
82 words
A control method according to claim 1, said control method further comprising the steps of: calculating an access frequency to each band, when a memory capacity of said disk drive is insufficient to store the most recent mapping data for every band of said disk, erasing from said memory, the mapping data for the band, which has the lowest accession frequency, and storing in said memory the most recently recorded mapping data from a band, which is being accessed for the first.
Claim 4
Dependent Claim
64 words
A control method according to claim 1, said control method further comprising the steps of: recording the order in which each band is accessed, in order to retain the oldest accessed band erasing from memory, the mapping data from said oldest accessed band, and storing in said memory the most recently recorded mapping data from a band, which is being accessed for the first.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-25 | 1995-05-27 | 1995-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-25 | 1999-05-27 | 1999-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-25 | 2003-05-27 | 2003-11-26 | $7700.00 | Window Closed / Lapsed |