WO1989008308A1 - Procede pour enregistrer des donnees de servoposition integrees dans des pistes de donnees de supports d'enregistrement rotatifs - Google Patents

Procede pour enregistrer des donnees de servoposition integrees dans des pistes de donnees de supports d'enregistrement rotatifs Download PDF

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Publication number
WO1989008308A1
WO1989008308A1 PCT/DE1989/000084 DE8900084W WO8908308A1 WO 1989008308 A1 WO1989008308 A1 WO 1989008308A1 DE 8900084 W DE8900084 W DE 8900084W WO 8908308 A1 WO8908308 A1 WO 8908308A1
Authority
WO
WIPO (PCT)
Prior art keywords
data
servo
position information
track
head
Prior art date
Application number
PCT/DE1989/000084
Other languages
German (de)
English (en)
Inventor
Martin Pellert
Rupert Etzbach
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO1989008308A1 publication Critical patent/WO1989008308A1/fr

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
    • G11B5/59633—Servo formatting
    • G11B5/5965—Embedded servo format

Definitions

  • the invention relates to a method according to the preamble of the main claim.
  • a separate servo surface is provided by the variable storage of data heads, for example by the influence of temperature and tension compared to a servo head on the servo surface.
  • the Sef pre-control is characterized in that a servo control signal is generated from separate servo position information recorded on the servo surface and classified according to servo track types, with which the data heads are controlled and positioned for writing and reading data in or from data tracks on a recording medium become.
  • the track density can now be increased even further by readjusting the data heads positioned by the tracking control become.
  • the information required for this readjustment of the data heads is carried out on the basis of servo position information.
  • the servo position information is recorded in each case in servo sectors of a data track embedded between two data sectors on a data surface of the disk memory with the data header assigned for this purpose. It is particularly necessary here that the recorded embedded servo position information is retained for all subsequent read / write operations.
  • a method is conceivable in which the embedded servo position information is recorded in a laser-guided manner. With this method, however, it has the disadvantage that the servo position information is not recorded in the fully assembled disk memory. Thus, when the laser-guided positioner is removed from the disk memory, the storage of the data heads is changed again after the embedded servo position information has been recorded. Furthermore, the problem that the disk memory should be written at a temperature which can still be tolerated when the data heads are stored due to temperature can only be solved very poorly. The properties mentioned therefore restrict in particular the static modulation range of the data heads readjusted by the recording of the servo position information.
  • Another major disadvantage is the restriction of the dynamic modulation range. For example, track deviations that have already arisen when the position information is written on the servo surface are not included in the recording of the servo position information on the data surfaces. This results in an additional error signal which increases the waviness of a servo position signal generated from the recorded embedded servo position information.
  • the present invention is therefore based on the object de, to create a method of the type mentioned at the beginning, with which the static and dynamic modulation range "of the data heads to be readjusted by recording the embedded servo position information and positioned via data tracks on data surfaces is not permanently limited and the time frame for recording the embedded servo position information in a disk memory is not exceeded.
  • the servo position information is recorded as a function of the position of a servo head on a separate servo surface by the data heads in servo sectors of the data tracks.
  • the method according to the invention for recording the embedded servo position information is distinguished in particular by the fact that tolerances of the data head widths are compensated by the data heads being shifted bidirectionally and radially from the data track center specified by the tracking control of the servo head.
  • Bidirectional-radial here means a radial offset of the data head in accordance with a constant value in a radial direction of the data surface assigned to the data head and in accordance with " a variable value in the opposite radial direction.
  • the one already in the servo sectors Servo position information described in the data track when writing to the adjacent data track is not influenced by the fact that a structural condition in the construction of the disk memory which is different to a greater extent according to statistical laws Spindle stroke can be taken into account and that the
  • FIG. 1 shows a basic structure of a magnetic disk memory shown in functional blocks
  • FIG. 6 shows a servo uster of the servo information recorded in the servo sector of a data track.
  • a magnetic disk memory 1 is shown schematically in its essential functional blocks.
  • the magnetic disk memory consists of a drive 10 and one Control system 11.
  • the drive essentially comprises a magnetic disk stack 2 and a positioning system 3.
  • the magnetic disk stack has a spindle 20 which can be rotated by a motor 21 and onto which the record carriers 22 are pushed.
  • the recording media rotating in the operating state each have two data surfaces 221, while one surface is reserved as a servo surface 220 for a recording medium.
  • the distance between the individual recording media is dimensioned such that two magnetic heads, each fastened to support arms 32, can dip into the spaces 23 formed in this way.
  • a servo head 33 which is designed as a read head, is assigned to the servo surface.
  • data heads 34 assigned to the data surfaces are designed as read / write heads.
  • the immersion process is brought about by a rotary positioner 31 to which the support arms are attached.
  • the rotary positioner contains a current-carrying plunger 310 and a cylindrical permanent magnet 311.
  • a preamplifier 30 is also arranged on the rotary positioner, which on the one hand has a signal line 35 with the servo head 33 or the data heads 34 and on the other hand with the electronic control system 11 of the disk storage is connected.
  • the electronic control system has a microprocessor 110 and a memory unit 111, with which the magnetic heads are controlled and data are written to or read from data tracks on the data surfaces.
  • the data surface 221 or the servo surface 220 of the recording medium 22 is characterized by concentrically running data tracks DS, which are each subdivided into servo sectors DS 'and data sectors DS ". This division of the data tracks and the associated reduction in the storage capacity per data surface are consciously accepted. to on the other hand through the in the Servo sectors recorded servo position information, if necessary, to be able to readjust the data head controlled by the servo head. With regard to the servo position information recorded in the servo sectors, one also speaks of embedded servo position information.
  • concentrically extending servo tracks SS are arranged, in which the separate servo position information that can be classified for the tracking control according to servo types SST is recorded.
  • FIG. 4 shows a section of a servo sector DS 'on the data surface 221.
  • two adjacent data tracks DSx and DSx + 1 between an initial data track DSxO and an end data track DSx ax are considered.
  • the servo position information which together with the recorded separate servo position information on the servo surface, determines the position of the data heads above the respective data surface for writing and reading data, and information for the automatic Differentiated gain control.
  • a settling zone EZ for storing the information for the automatic gain control and an evaluation zone AZ for storing the embedded servo position information are therefore provided in each servo sector on the data surfaces of the disk memory.
  • 16 bytes each are described with the servo position information and the information for the automatic gain control.
  • Track-controlled positioning means here that the data head is dependent on the serially positioned Ser - Vokopf on the servo surface by a servo control signal generated from the recorded separate servo position information follows the servo head and is thus positioned via the data track DSx or the data track DSx + 1. This positioning process now takes place simultaneously for all data heads of the disk memory using the positioning system 3 described in FIG. 1.
  • FIG. 6 shows representative of all data headers.
  • the recording process of the servo information for a data head Then the data head is first shifted from the track center of the data track DSx predetermined by the servo head by a value ya which is constant for all recording processes, for example in the edge direction of the recording medium under consideration. At this point, a first track type ST1 of the servo position information is then recorded.
  • the constant value ya is set once for all data heads at the beginning of the recording process.
  • y i With regard to the initial position of the data head specified by the servo head, it is subsequently set in the opposite direction by a variable value y i. In contrast to the value ya, however, this value is only constant at the beginning of a first recording process and afterwards, if necessary, for all data heads. different. To take this fact into account, an offset matrix Yht is set up, whose row vector t corresponds to the number of servo track types SST and whose column vector h corresponds to the number of data heads 34 and in which the respective variable value yi is stored.
  • the different servo track types SST result from the servo pattern of the separate servo position information. With consideration of the servo track types, differences in control electronics in the track sequence it are also included at the same time. For each recording process of the data header assigned to the data surface under consideration, Thus, for example with four different servo track types, there is a line vector t with vector elements yil, ... yi4. Depending on the type of servo track, the data header is offset by the respective vector element yil, yi4. If the data head is now offset from the center of the data track in accordance with the matrix element value, a track type ST2 of the servo position information is recorded in the evaluation zone of the servo sector at this point.
  • the data head is then positioned on the data track DSx + 1 in a track-controlled manner and the data head is shifted again by the constant value ya.
  • the second track type ST2 of the embedded servo position information is now recorded.
  • the data heads are again positioned on the track center of the data track DSx in a track-controlled manner and the information for the automatic gain control AGC is recorded in the settling zone of the servo sector.
  • FIG. 6 shows the servo uster of the servo information recorded in the servo sector DS 'of the data track DSx.
  • this servo read signal is composed of two parts, a sinusoidal Si. Signal component for the automatic gain control and a servo position signal with which the tracking-controlled data heads are readjusted. Characteristic of this servo position signal are a synchronization pulse S and two position pulses II, 12, which correspond to the written pattern of the servo position information in FIG.
  • FIG. 8 shows a flowchart for recording the servo position information in the data tracks DS of the rotating record carrier 23 of the disk storage device 1 and for the facts explained so far.
  • the recording of the servo position information begins with the fact that the start data track DSxO and the end data track DSxmax are determined on the data surfaces 221, that the number of data heads 34 and servo track types SST is determined and that the constant value ya is used as the starting values for the recording process and the offset matrix Yht are predefined.
  • the recording process (AV) described in FIG. 8, already described for a data head is carried out in succession for all data heads ho ... hmax.
  • y 35 amplitude values are measured.
  • An average value MW and a difference MM are then formed from these 35 values, which are made up of a maximum amplitude value dAmax and a minimum amplitude value dAmin calculated.
  • Both the magnitude of the mean value MW and the difference MM must remain below a first defined threshold MWmax or a second defined threshold MM ax so that the servo position signal is accepted. If this is not the case, the recording process described is repeated for both data tracks in both cases.
  • the variable value yi of the offset matrix Yht corresponding to the respective data header and the servo track type is replaced by a new value yi, and thereby both the head edge of the data head writing the middle of the data track and the middle of the data track itself are shifted.
  • This new value is calculated from the absolute amount and the polarity of the mean MW. Only when the servo position signal is accepted will the recording process for the data heads or the data track cylinders be carried out in succession in the following. In this way, an automatic adaptation of the matrix element values of the offset matrix to the different data head widths at the beginning of the recording process and an ongoing updating of these values is achieved.
  • the method described has the advantage that the servo position information on the data surfaces of the magnet ".:. Disk storage .spur mergegeregelt recorded-be This results in an increased storage capacity of the Plat ⁇ ten Itemss that has a wider range of applications of that result, the recording operation described ge - ensures in particular, a relation in spite of the great effort with respect to the 'subsequent writing and reading of .und to the servo head uniform filing fe of köp ⁇ tion information by continuously moving and repositioning, a lasting in the time frame recording the Servoposi- and a associated with the recording simultaneous deletion of the data sectors on the data Surfaces.
  • the last-mentioned criterion also means that at the end of the recording operation, the space (not described as turf) between the individual data tracks on the surfaces, which is not described, is erased with direct current.

Landscapes

  • Moving Of The Head To Find And Align With The Track (AREA)

Abstract

Les données de servoposition sont enregistrées traditionnellementau moyen de têtes de données (34) indépendamment de la position d'une servotête (33) au-dessus d'une servosurface (220). Pendant l'écriture et la lecture des données, néanmoins, la position des têtes de données est régulée pour permettre le suivi de la piste et réglée de nouveau sur la base des informations de servoposition, et de ce fait la plage dynamique et statique de réglage des têtes de données est inutilement restreinte. L'enregistrement des informations de servoposition s'effectue au moyen de têtes de données régulées pour permettre le suivi de la piste. Les têtes de données ainsi positionnées sont ensuite transférées dans une mémoireà disque magnétique (1) préassemblée, pour enregistrer les informations de servoposition provenant de chaque centre de piste de données prédéterminé par la servotête conformément à une valeur constante (ya) dans un sens radial et à des valeurs variables (yi) d'une matrice de transfert (Yht) dans le sens radial opposé du support d'enregistrement. Ce procédé s'utilise pour augmenter la densité de piste par surface de données (221) du support d'enregistrement et ainsi la capacité de stockage de la mémoire à disque magnétique.
PCT/DE1989/000084 1988-03-02 1989-02-13 Procede pour enregistrer des donnees de servoposition integrees dans des pistes de donnees de supports d'enregistrement rotatifs WO1989008308A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883806775 DE3806775A1 (de) 1988-03-02 1988-03-02 Verfahren zum aufzeichnen von in datenspuren rotierender aufzeichnungstraeger eingebetteter servopositionsinformation
DEP3806775.7 1988-03-02

Publications (1)

Publication Number Publication Date
WO1989008308A1 true WO1989008308A1 (fr) 1989-09-08

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PCT/DE1989/000084 WO1989008308A1 (fr) 1988-03-02 1989-02-13 Procede pour enregistrer des donnees de servoposition integrees dans des pistes de donnees de supports d'enregistrement rotatifs

Country Status (3)

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EP (1) EP0394360A1 (fr)
DE (1) DE3806775A1 (fr)
WO (1) WO1989008308A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5455724A (en) * 1992-03-31 1995-10-03 Fujitsu Limited Method of compensating offtrack in disk unit
DE4345282C2 (de) * 1992-03-31 2000-11-23 Fujitsu Ltd Verfahren zum Kompensieren einer Spurabweichung in einer Platteneinheit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4068268A (en) * 1976-01-08 1978-01-10 Idemoto Tom Y Method and apparatus for writing servo-tracks on rotating magnetic memory surfaces
EP0042931A2 (fr) * 1980-06-30 1982-01-06 International Business Machines Corporation Procédé d'initialisation de disques magnétiques
US4531167A (en) * 1983-08-25 1985-07-23 Pioneer Research, Inc. Servowriter system for magnetic disc drives
US4539607A (en) * 1981-10-12 1985-09-03 Tokyo Shibaura Denki Kabushiki Kaisha Servo track configuration for magnetic disk apparatus
EP0189503A1 (fr) * 1985-02-01 1986-08-06 Pioneer Research, Inc. Système d'écriture de servosignaux pour une mémoire à disques magnétiques

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4068268A (en) * 1976-01-08 1978-01-10 Idemoto Tom Y Method and apparatus for writing servo-tracks on rotating magnetic memory surfaces
EP0042931A2 (fr) * 1980-06-30 1982-01-06 International Business Machines Corporation Procédé d'initialisation de disques magnétiques
US4539607A (en) * 1981-10-12 1985-09-03 Tokyo Shibaura Denki Kabushiki Kaisha Servo track configuration for magnetic disk apparatus
US4531167A (en) * 1983-08-25 1985-07-23 Pioneer Research, Inc. Servowriter system for magnetic disc drives
EP0189503A1 (fr) * 1985-02-01 1986-08-06 Pioneer Research, Inc. Système d'écriture de servosignaux pour une mémoire à disques magnétiques

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 374 (P-527) 2431 12 Dezember 1986, & JP-A-61 168114 (SEIKO EPSON CORPORATION) 29 Juli 1986, *
PATENT ABSTRACTS OF JAPAN vol. 9, no. 170 (P-373) 1893 16 Juli 1985, & JP-A-60 47273 (FUJITSU K.K.) *
PATENT ABSTRACTS OF JAPAN vol. 9, no. 79 (P-347) 1802 09 April 1985, & JP-A-59 210530 (FUJITSU) 29 November 1984, *

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DE3806775A1 (de) 1989-09-14
EP0394360A1 (fr) 1990-10-31

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