US4884274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detection of non-zero errors in the prefix and completion frames of high density magnetic tapes and apparatus therefor
Assignee: Aspen Peripherals Corp
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Filing: 1988-04-19
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Granted: 1989-11-28
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Expires: 2008-04-19
Abstract
Abstract A method and apparatus for correcting the presence of non-zeros in the prefix and completion frames of a high density magnetic storage tape and for issuing a pointer identifying the track and frame that the non-zero error condition arose.
Inventors
- 👤 Howard H. Rather
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:08
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/12; G11B20/1201; G11B20/1202; G11B20/1205; G11B20/18; G11B20/1833
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
212 words
An apparatus for correcting the presence of non-zero errors in high density magnetic storage tape, said high density magnetic storage tape having prefix and completion frames, each of said prefix and completion frames having a plurality of tracks wherein each said track has byte fields set to all zeroes, each said track and each said byte field having an identity and whereas said prefix frames are frame counts one and two when said tape is read in the forward direction and wherein said completion frames are frame counts one and two when said tape is read in the reverse direction, said apparatus comprising: means receptive of each of said byte fields for each of said plurality of tracks in said frame counts one and two of said prefix and completion frames for determining whether each said byte field contains a non-zero error, means connected to said determining means for storing the identity of the track containing said non-zero byte field and the identity of the frame, and means receptive of each of said byte fields for each of said plurality of tracks in said frame counts one or two of said prefix and completion frames for setting all said byte fields to zero so that any non-zero errors contained therein are corrected.
Claim 2
Independent Claim
212 words
An apparatus for correcting the presence of non-zero errors in high density magnetic storage tape, said high density magnetic storage tape having prefix and completion frames, each of said prefix and completion frames having a plurality of tracks wherein each said track has byte fields set to all zeroes, each said track and each said byte field having an identity and whereas said prefix frames are frame counts one and two when said tape is read in the forward direction and wherein said completion frames are frame counts one and two when said tape is read in the reverse direction, said apparatus comprising: means receptive of each of said byte fields for each of said plurality of tracks in said frame counts one and two of said prefix and completion frames for determining whether each said byte field contains a non-zero error, means connected to said determining means for storing the identity of the track containing said non-zero byte field and the identity of the frame, and means receptive of each of said byte fields for each of said plurality of tracks in said frame counts one or two of said prefix and completion frames for setting all said byte fields to zero so that any non-zero errors contained therein are corrected.
Claim 3
Independent Claim
167 words
An apparatus for detecting the presence of non-zero errors in high density magnetic storage tape, said high density magnetic storage tape having prefix and completion frames, each of said prefix and completion frames having a plurality of tracks wherein each said track has byte fields set to all zeroes, each said track and each said byte field having an identity and whereas said prefix frames are frame counts one and two when said tape is rear in the forward direction and wherein said completion frames are frame counts one and two when said tape is read in the reverse direction, said apparatus comprising: means receptive of each of said byte fields for each of said plurality of tracks in said frame counts one and two of said prefix and completion frames for determining whether each said byte field contains a non-zero error, and means connected to said determining means for storing the identity of the track containing said non-zero byte field and the identity of the frame.
Claim 4
Independent Claim
167 words
An apparatus for detecting the presence of non-zero errors in high density magnetic storage tape, said high density magnetic storage tape having prefix and completion frames, each of said prefix and completion frames having a plurality of tracks wherein each said track has byte fields set to all zeroes, each said track and each said byte field having an identity and whereas said prefix frames are frame counts one and two when said tape is rear in the forward direction and wherein said completion frames are frame counts one and two when said tape is read in the reverse direction, said apparatus comprising: means receptive of each of said byte fields for each of said plurality of tracks in said frame counts one and two of said prefix and completion frames for determining whether each said byte field contains a non-zero error, and means connected to said determining means for storing the identity of the track containing said non-zero byte field and the identity of the frame.
Claim 5
Independent Claim
148 words
An apparatus for correcting the presence of non-zero errors in high density magnetic storage tape, said high density magnetic storage tape having prefix and completion frames, each of said prefix and completion frames having a plurality of tracks wherein each said track has byte fields set to all zeroes, each said track and each said byte field having an identity and whereas said prefix frames are frame counts one and two when said tape is read in the forward direction and wherein said completion frames are frame counts one and two when said tape is read in the reverse direction, said apparatus comprising: means receptive of each of said byte fields for each of said plurality of tracks in said frame counts one or two of said prefix and completion frames for setting all said byte fields to zero so that any non-zero errors contained therein are corrected.
Claim 6
Independent Claim
148 words
An apparatus for correcting the presence of non-zero errors in high density magnetic storage tape, said high density magnetic storage tape having prefix and completion frames, each of said prefix and completion frames having a plurality of tracks wherein each said track has byte fields set to all zeroes, each said track and each said byte field having an identity and whereas said prefix frames are frame counts one and two when said tape is read in the forward direction and wherein said completion frames are frame counts one and two when said tape is read in the reverse direction, said apparatus comprising: means receptive of each of said byte fields for each of said plurality of tracks in said frame counts one or two of said prefix and completion frames for setting all said byte fields to zero so that any non-zero errors contained therein are corrected.
Claim 7
Independent Claim
201 words
A method for correcting the presence of non-zero errors in high density magnetic storage tape, said high density magnetic storage tape having prefix and completion frames, each of said prefix and completion frames having a plurality of tracks wherein each said track has byte fields set to all zeroes, each said track and each said byte field having an identity and whereas said prefix frames are frame counts one and two when said tape is read in the forward direction and wherein said completion frames are frame counts one and two when said tape is read in the reverse direction, said method comprising the steps of: determining whether each of said byte fields for each of said plurality of tracks in said frame counts one and two of said prefix and completion frames contains a non-zero error, storing the identity of the track containing said non-zero byte field and the identity of the frame in response to said determination, and setting all said byte fields into zero sa that any non-zero errors contained therein are corrected, each of said byte fields for each of said plurality of tracks in said frame counts one or two of said prefix and completion frames.
Claim 8
Independent Claim
201 words
A method for correcting the presence of non-zero errors in high density magnetic storage tape, said high density magnetic storage tape having prefix and completion frames, each of said prefix and completion frames having a plurality of tracks wherein each said track has byte fields set to all zeroes, each said track and each said byte field having an identity and whereas said prefix frames are frame counts one and two when said tape is read in the forward direction and wherein said completion frames are frame counts one and two when said tape is read in the reverse direction, said method comprising the steps of: determining whether each of said byte fields for each of said plurality of tracks in said frame counts one and two of said prefix and completion frames contains a non-zero error, storing the identity of the track containing said non-zero byte field and the identity of the frame in response to said determination, and setting all said byte fields into zero sa that any non-zero errors contained therein are corrected, each of said byte fields for each of said plurality of tracks in said frame counts one or two of said prefix and completion frames.
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) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |