Dynamic magnetic information storage or retrieval – General recording or reproducing – Signal switching
Patent
1994-04-05
1998-09-08
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Signal switching
360 75, G11B 2100
Patent
active
058053700
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a magnetic recording device, and particularly to a head-switching method for a staggered servo and circuit thereof.
DISCUSSION OF RELATED ART
FIG. 1 illustrates a method for writing sector identification codes (sector ID codes) for distinguishing sectors during head-switching in a conventional servo mechanism.
Referring to FIG. 1, in a servo mechanism, when disks are placed in a vertical arrangement, sector ID codes for distinguishing the sectors are vertically aligned with each other. If the sector ID codes are written as shown in FIG. 1, after sector ID codes are completely written on a disk surface, then sector ID codes are written on a next disk surface, so that the writing time takes as much as the rotation number corresponding to the number of disk surfaces, causing the time to be lengthened.
FIG. 2 illustrates a method for writing sector ID codes for distinguishing sectors during head-switching in a conventional staggered servo mechanism.
Referring to FIG. 2, in the conventional staggered servo mechanism, since the sector ID codes are written by skewing according to a skew value, for one rotation, the sector ID codes are completely written on the overall disk surfaces, thereby shortening the recording time. However, in the conventional sector ID code detection method of the staggered servo mechanism, a sector ID code is detected while skipping one or two sectors. In other words, when a head is switched from disk recording surface HD0 to disk recording surface HD1, point A, which is a data area, is forecast as the location of a next sector ID code to repeat the detection operation, so that one or two sector ID codes are skipped or a data read error is created.
SUMMARY OF THE INVENTION
Therefore, it is an object of the present invention to provide a head-switching method which precisely detects a sector ID code written according to a staggered servo mechanism during a head-switching operation.
It is another object of the present invention to provide a head-switching circuit which precisely detects a sector ID code written according to a staggered servo mechanism during a head-switching operation.
To accomplish the first object, there is provided a head-switching method for switching a head operating on one recording medium surface to a head operating on another recording medium surface selected from a plurality of recording medium surfaces so as to read out data written on the selected recording medium surface according to a staggered servo mechanism, the method comprising: code of the recording medium surface selected by the selecting step and a sector identification code of a recording medium surface being selected by a next selecting step; and for switching a head operating on one recording medium surface to a head operating on another recording medium surface selected from a plurality of recording medium surfaces so as to read out data written on the selected recording medium surface according to a staggered servo mechanism, the circuit comprising: surfaces; identification code of the recording medium surface currently selected by the selecting means and a sector identification code of a recording medium surface being selected next by the selecting means; and means for generating a sync signal when the skew time equals a predetermined time.
BRIEF DESCRIPTION OF DRAWINGS
The above objects and other advantages of the present invention will become more apparent by describing in detail a preferred embodiment thereof with reference to the attached drawings in which:
FIG. 1 illustrates a method for writing sector identification codes for distinguishing sectors during head-switching in a conventional aligned servo mechanism;
FIG. 2 illustrates a method for writing sector ID codes for distinguishing sectors during head-switching in a general staggered servo mechanism, to which the prior art and the present invention may be equally applied;
FIG. 3 illustrates a method for, when a head of a current disk surface is switched to a head of anothe
REFERENCES:
patent: 5444583 (1995-08-01), Ehrlich et al.
patent: 5473482 (1995-12-01), Saito et al.
patent: 5475544 (1995-12-01), Takeuchi
Psitos Aristotelis M.
Samsung Electronics Co,. Ltd.
Wong K.
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