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US5216656A
Expired / Lapsed
US
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Method for recording a cd-ram which is compatible with a conventional cd recording format while allowing fast accessing
Assignee: Sony Corp
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Filing: 1991-06-10
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Granted: 1993-06-01
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Expires: 2011-06-10
Abstract
Abstract A method of recording user data on a DC-RAM disc medium comprising the steps of recording servo signals in a pair of spaced apart servo areas in each one of a predetermined number of segments which form a predetermined number of sectors of each one of a plurality of recording tracks on the disc medium, and recording along a portion of each track, between each servo area, units of 12 bytes of user data and 4 bytes of parities for the user data so that among the predetermined number of segments are a plurality of user data segments each consisting of a servo signal and one or more units of 12 bytes of user data and the parities for the 12 bytes of user data.
Inventors
- 👤 Yoichiro Sako
- 👤 Tamotsu Yamagami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:03
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B27/3063; G11B20/00; G11B20/10; G11B20/12; G11B20/1217; G11B20/18; G11B20/1833; G11B27/24; G11B7/00; G11B7/007; G11B7/013; G11B2020/1087; G11B2020/10879; G11B2220/00; G11B2220/20; G11B2220/21; G11B2220/215; G11B2220/216; G11B2220/25; G11B2220/2525; G11B2220/2537; G11B2220/2545
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
A method of recording user data on a CD-RAM disc medium comprising the steps of: recording servo signals in a pair of spaced apart servo areas in each one of a predetermined number of segments which form a predetermined number of sectors of each one of a plurality of recording tracks on the disc medium; and recording along a portion of each track, between each servo area, units of 12 bytes of user data and 4 bytes of parities for the user data so that among the predetermined number of segments are a plurality of user data segments each consisting of a servo signal and one or more units of 12 bytes of user data and the parities for the 12 bytes of user data.
Claim 2
Independent Claim
125 words
A method of recording user data on a CD-RAM disc medium comprising the steps of: recording servo signals in a pair of spaced apart servo areas in each one of a predetermined number of segments which form a predetermined number of sectors of each one of a plurality of recording tracks on the disc medium; and recording along a portion of each track, between each servo area, units of 12 bytes of user data and 4 bytes of parities for the user data so that among the predetermined number of segments are a plurality of user data segments each consisting of a servo signal and one or more units of 12 bytes of user data and the parities for the 12 bytes of user data.
Claim 3
Dependent Claim
39 words
A method as claimed in claim 1, further comprising the steps of: recording along each track among the predetermined number of segments, at predetermined intervals between the user data segments, address segments in which are recorded sector address signals.
Claim 4
Dependent Claim
56 words
A method as claimed in claim 2, wherein the step of recording the address segments comprises the steps of: recording in each address segment, between the servo areas, a sector mark, a sector number, a parity for the sector number, a sector mark, a sector number, a parity for the sector number, and a control signal.
Claim 5
Dependent Claim
16 words
A method as claimed in claim 1, wherein the predetermined number of segments is two hundred.
Claim 6
Dependent Claim
17 words
A method as claimed in claim 1, wherein the data length of each segment is 18.375 bytes.
Claim 7
Dependent Claim
39 words
A method as claimed in claim 1, wherein during the step of recording the user data, only a single unit of 12 bytes of user data and the parities for the user data is recorded between each servo area.
Claim 8
Dependent Claim
38 words
A method as claimed in claim 1, wherein during the step of recording the user data, two units of 12 bytes of user data and the parities for the user data are sequentially recorded between each servo area.
Claim 9
Dependent Claim
18 words
A method as claimed in claim 1, further comprising the step of recording a subcode in each segment.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-31 | 1996-11-30 | 1997-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-31 | 2000-11-30 | 2001-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-31 | 2004-11-30 | 2005-06-01 | $7700.00 | Window Closed / Lapsed |