Apparatus and method employed in disk drive to enable single signal line to be used for transmission of both read and control signals
AssigneeKabushiki Kaisha Toshiba
InventorTakahiro Koyanagi
Life of this patent
Estimating the term…
Abstract
A first amplifier which amplifiers a faint read signal read by a head is connected to a second amplifier which further amplifiers the read signal amplified by the first amplifier, via a signal line. The signal line is used to transmit the read signal from the first amplifier to the second amplifier, and also to transmit a control signal from the second amplifier to the first amplifier. On the basis of, for example, a point in time at which a servo mark is detected from servo data, a control unit sets a period of time in which the transmission of the control signal from the second amplifier to the first amplifier is permitted, so that it does not overlap a period of time in which the servo data is read.
Claims14
A disk drive apparatus which executes positioning control to position a head to a target position on the basis of servo data read by the head from each of the servo areas dispersedly arranged on a disk medium, comprising:
- a first amplifier which amplifiers a read signal read by the head from the disk medium;
- a second amplifier which further amplifiers the read signal amplified by the first amplifier;
- a signal line used to transmit the read signal from the first amplifier to the second amplifier, and also to transmit a control signal from the second amplifier to the first amplifier, the control signal being used to control the first amplifier;
- and
- a transmission controller configured to permit the transmission of the control signal from the second amplifier to the first amplifier during a period of time different from a period of time in which the servo data is read.
A disk drive apparatus which executes positioning control to position a head to a target position on the basis of servo data read by the head from each of the servo areas dispersedly arranged on a disk medium, comprising:
- a first amplifier which amplifiers a read signal read by the head from the disk medium;
- a second amplifier which further amplifiers the read signal amplified by the first amplifier;
- a signal line used to transmit the read signal from the first amplifier to the second amplifier, and also to transmit a control signal from the second amplifier to the first amplifier, the control signal being used to control the first amplifier;
- a servo mark detector which detects the servo mark in the servo data;
- a CPU which executes an interruption processing program in accordance with detection of the servo mark by the servo mark detector, the program being formed of a plurality of processing routines which include a control signal transmission routine used to transmit the control signal;
- and
- a storage unit configured to store programs which include the interruption processing program executed by the CPU, the control signal transmission routine included in the plurality of processing routines of the interruption processing program being in an ordinal position in which the control signal transmission routine is executed within a period of time different from a period of time in which the servo data is read.
A method of using a single signal line to transmit both a read signal and a control signal, for use in a disk drive apparatus which executes positioning control to position a head to a target position on the basis of servo data read by the head from each of the servo areas dispersedly arranged on a disk medium, comprising:
- transmitting the control signal from a second amplifier to a first amplifier via the signal line, the control signal being used to control the first amplifier, the signal line being also used to transmit the read signal, read by the head from the disk medium, from the first amplifier which amplifies the read signal, to the second amplifier which further amplifies the read signal amplified by the first amplifier;
- and
- permitting transmission of the control signal from the second amplifier to the first amplifier only within a period of time different from a period of time in which the servo data is read.
Dependencies are inferred from the claim text.