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MAGNETIC DISK or MAGNETIC DISKS
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Technical Examples
- A type of servo pattern suitable for tracking systems in magnetic recording devices such as floppy disks or linear tape or hard disks or in other machines. The pattern comprises several phase-encoded elements that provide an absolute transverse position coordinate from local data. Computations can be made with channel chips commonly used in magnetic recording disk drives.
- In a disk stand device and a disk storage device for use in compact disks, mini disks and floppy disks, an array of grooves (2) are provided on an upper surface of a pedestal (1) at predetermined intervals (L). When one end of a disk (3) is inserted into the groove (2) upon accommodating the disks (3), a plurality of disks (3) are positioned to overlap with the predetermined intervals (L) therebetween. A title labelled on the disk (3) can be visually recognized through the intervals (L) of the neighboring disks (3). Upon reusing the disk (3), the disk (3) can be taken out of the groove (2) quicky to improve an efficiency at offices in which electronic computers are employed.
- Where a leakage magnetic field deletes data on adjacent tracks gradually, such deletion is compensated so as to prevent data errors from occurring. A magnetic disk device includes one or more magnetic disks, one or more magnetic heads, and a write and read circuit for writing or reading data, and writes or reads the data on tracks on the magnetic disks. The number of writes of the data on a given track is acquired. If the number of writes reaches a predetermined number, the data on the tracks adjacent to a given track is read out once and, then, the data is rewritten on the adjacent tracks. Further, when the data is written on the tracks, the data is written on alternate physical tracks and every other track is skipped, and after the data is written on half of all tracks, the data is written on the skipped tracks.
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