EP0157834A1 - Disque d'enregistrement d'informations de diagnostic preformate - Google Patents

Disque d'enregistrement d'informations de diagnostic preformate

Info

Publication number
EP0157834A1
EP0157834A1 EP19840903604 EP84903604A EP0157834A1 EP 0157834 A1 EP0157834 A1 EP 0157834A1 EP 19840903604 EP19840903604 EP 19840903604 EP 84903604 A EP84903604 A EP 84903604A EP 0157834 A1 EP0157834 A1 EP 0157834A1
Authority
EP
European Patent Office
Prior art keywords
preformatted
information recording
recording disk
recited
diagnostic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19840903604
Other languages
German (de)
English (en)
Inventor
Dave Beal
Don Clay
Don Dotzel
Rex Hamilton
Bob Houtz
Robert P. Mcintosh
Lee Warriner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Storage Technology Partners II
Original Assignee
Storage Technology Partners II
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Storage Technology Partners II filed Critical Storage Technology Partners II
Publication of EP0157834A1 publication Critical patent/EP0157834A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • G11B20/1816—Testing
    • G11B20/182—Testing using test patterns
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
    • G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
    • G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
    • G11B27/32—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on separate auxiliary tracks of the same or an auxiliary record carrier
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/36—Monitoring, i.e. supervising the progress of recording or reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
    • G11B7/00375—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs arrangements for detection of physical defects, e.g. of recording layer
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
    • G11B2220/215—Recordable discs
    • G11B2220/218—Write-once discs

Definitions

  • This invention relates to the field of testing and diagnosis of machine performance parameters, and more particularly to the in-device diagnosis and testing of information storage and retrieval devices.
  • diagnostic testing routines are well known to those known in the art.
  • diagnostic routines have ordinarily required either the mounting of a special diagnostic disk, or moving to a specified portion of the disk and attempting to write and read test data in order to verify machine performance. " This has lead to a number of problems. For example, with a magnetic disk drive, the fact that test data must be written and read makes it difficult to determine whether the malfunction is in the write function or the read function. Also, when it is necessary to mount a separate diagnostic disk, should centering of the disk be a problem, the mounting and demounting may cause difficulty in finding this
  • a preformatted diagnostic information recording disk for use in a device having removable disks is comprised of: an optically smooth and light reflective substrate, (or alternatively, a separate planarizing and light reflective layers overlaying the substrate), and an active layer of light absorbing material deposited over the reflecting surface.
  • data for diagnostic information use is recorded in the active layer of the disk by irradiation by focus laser beam, causing a mark to be formed in the active layer (this mark or absence of a mark representing data points).
  • the disk is preformatted by placing the disk in a servo writing machine which precisely writes concentric information tracks on the disk surface. A plurality of diagnostic tracks are written, each for the specified purpose. By preformatting the disk with precisely written tracks, the problem of segregating a read problem from a write problem is eliminated.
  • the platter disk is divided by the servo/clocking tracks into 716 bands, of which 713 are available for user data.
  • the band ⁇ are addressed -consecutively in ascending sequence has been 0 through 715 from the outer band toward the inner.
  • the bands are separated by special servo coarse seek tracks which also are designed to provide a clocking signal.
  • tracks are numbered consecutively in ascending sequence from the outside of the band to the inside.
  • the first band is the diagnostic band used for providing diagnostic information for the device diagnostic routine.
  • the second band is the index band used for assisting in the device random access rapid seek function.
  • a track is written to test for proper reading of high transition rate user data, low transition rate user data, for worse case DC offset, for the worse case user data recorded with rapid variations in data transition frequency, for interference of user data with the clocking sequence for the disk, for testing the device rapid band search technique; for testing the proper electrical and mechanical centering of the servo galvo mirrors, and to verify the proper alignment of the read/write focus and tracking spots.
  • a significant amount of space is left unwritten to allow for the writing of test data in order to verify a proper write function for the device.
  • the preformatted disk is therefor a valuable tool in testing for all levels of diagnostic routines, including host, control unit and device performance.
  • the disk is also preformatted with a plurality of clocking/coarse seek bands.
  • the clocking bands are used for proper synchronization of data reading and writing.
  • the coarse seek bands are used to aid the random access coarse and
  • OMPI fine seek function of the optical storage and retrieval device for which use of this disk is contemplated.
  • data is recorded on a plurality of tracks between the coarse seek/servo clocking tracks, defining a band.
  • the diagnostic band it is contemplated that all of the diagnostic tracks will be placed in the outermost band of the disk hereinafter referred to as the diagnostic band.
  • a significant area of the diagnostic band remains unwritten to specifically allow test writing on the unwritten portions in order to verify device writing capabilities.
  • the device may be tested both for its reading performance based upon reading precisely written preformatted information, and well as being able to write on unwritten disk surface in order to verify the writing function. Also, it is contemplated that this disk will be used in a machine having removable media, therefore it is contemplated that each user disk would have preformatted thereon the diagnostic information tracks. Thus, problems related to disk miscentering can be tested because the disk need not be replaced prior to initiating the diagnostic routine.
  • the device controller Upon device spin up, the device controller automatically initiates a diagnostic sequence. During the sequence, the program will automatically call for the machine to first go to the preformatted tracks and test the various reading functions of the machine including the high and low data rate sensing functions, the precise alignment of the read/write focus and tracking spots, the proper centering of the tracking galvo, and the DC offset circuits. Additional higher order diagnostic routines can then conduct a series of rapid band searches in order to verify the rapid band search function of the device and, intensive read testing and write/read testing to verify other higher order functions.
  • the disk in order to test the random access and rapid band search function of the optical storage device, it is contemplated that the disk shall also have an index band which will have recorded thereon the location of the specific diagnostic diagnostic tracks, which will also allows verification of the device search algorithm.
  • the diagnostic tracks are also used to check machine performance should malfunction occur. Upon sequencing through the diagnostic routine, and interpreting the resulting read back information, experience will indicate the type of failure mode which is being encountered.
  • FIGURE 1 is a top schematic representation of a recording disk, showing the coarse seek/servo bands.
  • FIGURE 2 is an exploded view of the indicated area of FIGURE 3, showing the coarse seek tracks bounding the diagnostic band and representations of the diagnostic tracks.
  • the disk 1 has a plurality of coarse seek/clocking tracks 2 servo written thereon at the manufacturing facility.
  • the area between the servo/clocking tracks defines bands 3, in which information tracks 4 are to be written.
  • the preformatted diagnostic tracks 4a-4p are also written, with remaining areas for writing user information.
  • FIGURE 2 is an exploded view of area A-A of FIGURE 1.
  • FIGURE 2 shows the servo written preformatted tracks including, coarse seek tracks 2a and 2b, and a plurality of diagnostic tracks 4a-4p, each of which will be described below, along with unwritten surface for the writing of test data.
  • Each of the daignostic tracks are specifically recorded to provide a specific diagnostic testing mode, in order to verify that a particular circuit or operating mode is functioning properly. Together this area defines the diagnostic band 5.
  • the course seek tracks 2 are written at a 50% duty cycle and are used for timing purposes as well as aiding in the random access function of the device. -
  • a first diagnostic track 4a is servo written at a high frequency (in the preferred embodiment, a 8MHz frequency) 50% duty cycle using a 92H, 49H, 24H, 32 bit repeating cycle in order to stress the PLL read circuit in a worse case user recording mode. This is to provide a read data pattern which shows the high extreme of data recording, in order to verify that the read circuit can respond an accurately read data at this rate.
  • a high frequency in the preferred embodiment, a 8MHz frequency
  • Track 4b is a 50% duty cycle low frequency 32 ' bit group of code repeating 33H. This low frequency duty cycle is testing the read circuits response to low in data at the 3MHz frequency range. Together track 4a and 4b fully stress the read circuit at the constant high and low extremes of data reading.
  • Track 4c in the preferred embodiment is a 2-6 duty cycle 32 byte group of data points recorded in order to introduce a DC offset signal into the phase lock loop circuit. For example, if a square wave of +2 to -2 volts at a 50% duty cycle is fed into a circuit, the average voltage is 0. However, with a 2-6 duty cycle, the average is off zero, and can send an offset signal into the read circuit. By coding track 4c with this DC offset data pattern, the diagnostic routine can verify that the device electronics can compensate for this offset signal.
  • tracks 4d, 4e and 4f are each written to have rapid variations in the modulation of the recorded data in order to test the phase lock loop circuits for rapid changes and user data recording.
  • track 4d is recorded in code corresponding to 16 bytes of 33H, 16 bytes repeating of 32H, 49H, 24H.
  • Track 4e is recorded in 32 bytes of repeating 33H, 33H, 30H, 8AH, A8H, A2H.
  • Track 4f is recorded in 32 bytes of repeating code 49H, 2.
  • the clocking tracks 2 function at 50% duty cycle and are also used for coarse seeking operations.
  • a problem can exist with interference between customer data recorded at this frequency causing a malfunction in the coarse seek operation.
  • tracks 4h-41 are encoded with binary information which corresponds to the coarse seek pattern in order to verify that the system can isolate coarse seek track information from customer information recorded at the same frequency.
  • a multiple spot array is used for reading, writing, tracking and focussing. Because of variations in laser design, and laser aging, the precise spacing of the read, focus and tracking beams may vary. Thus, it is necessary to verify that precise alignment is attained as well as verifying proper alignment should a malfunction occur. Accordingly, two precisely spaced
  • OMPI tracks 4m and 4n are servo written in order to provide a means for verifying the proper track pitch is maintained in the system.
  • two tracks 4 ⁇ n and 4n are precisely spaced with respect to each other.
  • the read, focus and tracking beams are placed upon tracks 4m and 4n and the feedback signal is analyzed for proper spot spacing. If proper alignment is attained, a proper signal will be generated verifying the machines proper pitch, however, should the signals be incorrect, a malfunction signal can be generated by the diagnostic routine indicating misalignment of the read beams.
  • a centering track 4p precisely spaced between coarse seek tracks 2a and 2b, can be used to properly verify the device tracking system. By focussing on this precisely centered track, and by sensing the mechanical electrical alignment of the servo system, proper physical alignment reading and writing functions can be diagnosed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

Disque d'enregistrement d'informations de diagnostic préformaté (1) à utiliser dans un dispositif de recherche et de stockage par disques optiques pour permettre l'utilisation des disques sur lesquels sont enregistrés des données d'utilisateur afin de fournir une information de diagnostic au dispositif pour l'exécution automatique de programmes de diagnostic afin de vérifier le fonctionnement correct du dispositif. Le disque préformaté comporte une pluralité de pistes d'informations (4a, 4b, 4c,...) possédant chacune une configuration spécifique de données conçue pour tester une fonction spécifique du dispositif. Dans le mode préférentiel de réalisation, les paramètres testés comportent l'enregistrement des données à haute fréquence (piste 4a), l'enregistrement des données à basse fréquence (piste 4b), l'enregistrement des données de variation rapide (pistes 4d, 4e, 4f), la compensation de décalage de courant continu (piste 4c), l'isolation des signaux d'enregistrement de données/de synchronisation (pistes 4h - 4l), la vérification de centrage galvo (piste 4p), le fonctionnement d'accès rapide, l'alignement des points de lecture (pistes 4m - 4n) et le fonctionnement lecture-écriture (zone 5).
EP19840903604 1983-09-19 1984-09-18 Disque d'enregistrement d'informations de diagnostic preformate Withdrawn EP0157834A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US53382583A 1983-09-19 1983-09-19
US533825 1995-09-26

Publications (1)

Publication Number Publication Date
EP0157834A1 true EP0157834A1 (fr) 1985-10-16

Family

ID=24127585

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840903604 Withdrawn EP0157834A1 (fr) 1983-09-19 1984-09-18 Disque d'enregistrement d'informations de diagnostic preformate

Country Status (2)

Country Link
EP (1) EP0157834A1 (fr)
WO (1) WO1985001381A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62146471A (ja) * 1985-12-20 1987-06-30 Matsushita Electric Ind Co Ltd 光学的情報記録再生装置
US4789974A (en) * 1986-09-16 1988-12-06 Matsushita Electric Industrial Co., Ltd. Optical information recording/reproducing apparatus
AU640928B2 (en) * 1989-06-05 1993-09-09 Sony Corporation Check disc

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2522405C2 (de) * 1975-05-21 1982-04-15 Philips Patentverwaltung Gmbh, 2000 Hamburg Optisches Mehrkanal-Plattenspeichersystem zum Speichern von digitaler Information
US4094013A (en) * 1975-05-22 1978-06-06 U.S. Philips Corporation Optical storage disk system with disk track guide sectors
US4189746A (en) * 1978-03-23 1980-02-19 Rca Corporation Method and apparatus for determining focus conditions
US4428075A (en) * 1981-12-21 1984-01-24 Burroughs Corporation Methods of preformatting an optical disk

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8501381A1 *

Also Published As

Publication number Publication date
WO1985001381A1 (fr) 1985-03-28

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19850821

RIN1 Information on inventor provided before grant (corrected)

Inventor name: DOTZEL, DON

Inventor name: MCINTOSH, ROBERT, P.

Inventor name: HOUTZ, BOB

Inventor name: HAMILTON, REX

Inventor name: WARRINER, LEE

Inventor name: BEAL, DAVE

Inventor name: CLAY, DON