Claims
- 1. A magnetic disk comprising:
- an inde area provided in part of said magnetic disk, an index signal being recorded in said index area; and
- a limited number of radially extending servo sections formed only in a partial area spanning only a limited angular region of said magnetic disk and each intervening between selected data sectors positioned subsequent to said index area, each of said servo sections having a servo information area in which a servo information pattern signal is formed, said number of servo sections being 3 or 4, wherein an angular distance traversing each servo section from a first to a last servo section is smaller than an angular distance from the first to the last servo section when measured in an opposite direction not traversing said plural servo sections.
- 2. A magnetic disk according to claim 1, wherein first and second gap sections are provided on the opposite sides of said servo information area of each of said servo sectors to absorb rotational variations of said magnetic disk.
- 3. A magnetic disk according to claim 2, wherein said servo information area of each of said servo sectors has a first synchronizing section with a synchronizing signal recorded therein, an erase section adapted for detection of said servo sector, a second synchronizing section with a synchronizing signal recorded therein, and a position information section in which a plurality of position information bit cells for the positioning of said head are formed.
Priority Claims (1)
Number |
Date |
Country |
Kind |
60-210424 |
Sep 1985 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 911,120, filed on Sept. 24, 1986, now abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (2)
Number |
Date |
Country |
59-165279 |
Sep 1984 |
JPX |
60-74153 |
Apr 1985 |
JPX |
Non-Patent Literature Citations (2)
Entry |
IBM TDB, vol. 18, No. 8, "Null Servo Pattern", A. J. Betts, Jan. 1976, pp. 2656-2657. |
IBM TDB, vol. 23, No. 2, Jul. 1980, "Track-Locating and -Following Apparatus for a . . . ", R. C. Jahnke, pp. 738-742. |
Continuations (1)
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Number |
Date |
Country |
Parent |
911120 |
Sep 1986 |
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