Magnetic disk storage apparatus in which servo track zone provides signals for both moving speed and position of transducer
AssigneeFujitsu Limited
InventorYuji Inouye
Life of this patent
Estimating the term…
Abstract
A magnetic disk storage apparatus having a servo disk and a servo transducer cooperating therewith is described. The servo disk is provided with a magnetically pre-recorded concentric arrangement comprising of an inner guard zone, a servo track zone, and an outer guard zone. The servo track zone provides information regarding both the moving speed and the position of the servo transducer; while at least one of the inner or outer guard zones provides information regarding both the moving speed and the guard zone of the servo transducer.
Claims18
A magnetic disk storage apparatus comprising a plurality of data storage disks and a servo disk which are all rotated at a constant high speed, a plurality of data transducers, each of which electromagnetically cooperates with a respective one of said data storage disks, and a servo transducer which electromagnetically cooperates with said servo disk, a linear motor which moves said data transducers and said servo transducer with respect to said storage disks and said servo disk, respectively, and a controlling circuit which controls said linear motor so as to move said servo transducer, together with said data transducers, to a desired position relative to said servo disk in accordance with a command, wherein said servo disk is provided with, on its surface, an inner guard zone which can provide inner guard information to said controlling circuit when said servo transducer is located thereabove, an outer guard zone which can provide outer guard information to said controlling circuit when said servo transducer is located thereabove, and a servo track zone which can provide both moving speed information concerning the moving speed of said servo transducer and positioning information concerning the positioning of said servo transducer to said controlling circuit when the servo transducer is located above said servo track zone, characterized in that at least one of said inner guard zone and said outer guard zone can further provide moving speed information of said servo transducer to said controlling circuit when said servo transducer is located thereabove.
In a magnetic disk storage apparatus which includes a plurality of storage disks and a servo disk arranged in parallel along a rotational axis, a plurality of data transducers, one for each storage disk, a servo transducer which electromagnetically cooperates with said storage disks and said servo disk, respectively, to derive information therefrom, and a linear motor for moving said data transducers and said servo transducer in unison through various positions with respect to said storage disks and said servo disk, respectively, wherein said servo disk has an inner guard zone storing inner guard information, an outer guard zone storing outer guard information, and a servo track zone providing servo information which includes both moving speed information and positioning information;
- a control circuit for utilizing said servo information to control said linear motor and thus the positioning of said data transducers and said servo transducer, said control circuit comprising:
- position signal deriving means responsive to said servo information received from said servo transducer for producing outputs indicating the type of zone said servo transducer is above and indicating the position of said servo transducer within said zone, respectively;
- differentiating means for performing differentiation of said position-indicating output to derive a further output representing the actual moving speed of said servo transducer;
- reference deriving means responsive to said type-of-zone-indicating output and said position-indicating output for deriving therefrom a reference output representing a predetermined control speed of said servo transducer;
- and
- comparison means for comparing said further output of said differentiating means with said reference output of said reference deriving means to produce a control signal for controlling said linear motor.
Dependencies are inferred from the claim text.