1. An apparatus for servo writing in a disk drive, comprising:
an examination unit which executes examination to select an adequate servo pattern from a plurality of types of servo patterns recorded on a disk medium incorporated in the disk drive; and
a selection unit which selects as servo information of the disk drive the servo pattern judged to be adequate by the examination unit.
2. The apparatus according to claim 1, wherein the examination unit positions a head incorporated in the disk drive in a target position based on the plurality of types of servo patterns recorded on the disk medium via a control and signal processing system incorporated in the disk drive,
records data for examination on the disk medium by use of the head,
reproduces the data for examination by use of the head, and
measures a reproduction error rate of the reproduced data for examination, and
the selection unit selects the servo pattern having a relatively low reproduction error rate measured by the examination unit as the servo information of the disk drive.
3. The apparatus according to claim 1, wherein the examination unit positions a head incorporated in the disk drive in a target position based on the plurality of types of servo patterns recorded on the disk medium via a control and signal processing system incorporated in the disk drive, and
measures a movement amount of the head to the target position, and
the selection unit selects the servo pattern having a relatively small movement amount of the head measured by the examination unit as the servo information of the disk drive.
4. The apparatus according to claim 1, wherein the plurality of types of servo patterns are two or more types of servo patterns having different track pitches.
5. The apparatus according to claim 1, wherein the plurality of types of servo patterns are two or more types of servo patterns having different eccentricities.
6. The apparatus according to claim 1, wherein the selection unit deletes from the disk medium the servo pattern judged to be unselected based on a judgment result of the examination unit.
7. The apparatus according to claim 1, wherein a control and signal processing system incorporated in the disk drive deletes from the disk medium the servo pattern judged to be unselected based on a judgment result of the examination unit.
8. A method of servo writing for a disk drive, the method comprising:
executing examination to select an adequate servo pattern from a plurality of types of servo patterns recorded on a disk medium incorporated in the disk drive; and
selecting as servo information the servo pattern judged to be adequate by the execution of the examination.
9. The method according to claim 8, wherein the execution of the examination positions a head incorporated in the disk drive in a target position based on the plurality of types of servo patterns recorded on the disk medium,
records data for examination on the disk medium by use of the head,
reproduces the data for examination by use of the head, and
measures a reproduction error rate of the reproduced data for examination, and
the selection selects the servo pattern having a relatively low reproduction error rate measured by the examination as the servo information of the disk drive.
10. The method according to claim 8, wherein the execution of the examination positions a head incorporated in the disk drive in a target position based on the plurality of types of servo patterns recorded on the disk medium, and
measures a movement amount of the head to the target position, and
the selection selects the servo pattern having a relatively small movement amount of the head measured by the examination as the servo information of the disk drive.
11. The method according to claim 8, wherein the selection deletes from the disk medium the servo pattern judged to be unselected based on a judgment result of the examination.
12. The method according to claim 8, wherein the plurality of types of servo patterns recorded on the disk medium are two or more types of servo patterns having different track pitches.
13. The method according to claim 8, wherein the plurality of types of servo patterns recorded on the disk medium are two or more types of servo patterns having different eccentricities.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A switch mode power converter system, the system comprising:
a first isolation box;
a second isolation box; and
a plurality of transformer windings including:
an input primary winding for receiving an input signal for the switch mode power converter system;
an output secondary winding for generating an output signal for the switch mode power converter system;
a feedback winding for generating a feedback signal; and
a voltage supply winding for generating a voltage;
wherein:
the switch mode power converter system is configured to convert the input signal to the output signal;
the first isolation box includes:
one or more first metal boards; and
one or more first isolation winding turns;
wherein:
the one or more first metal boards are conductively connected to the one or more first isolation winding turns; and
the one or more first isolation winding turns are not part of any of the plurality of transformer windings;
the second isolation box includes:
one or more second metal boards; and
one or more second isolation winding turns;
wherein:
the one or more second metal boards are conductively connected to the one or more second isolation winding turns; and
the one or more second isolation winding turns are not part of any of the plurality of transformer windings;
the input primary winding is substantially enclosed in the first isolation box;
the output secondary winding and the feedback winding are substantially enclosed in the second isolation box; and
the first isolation box and the second isolation box are biased to a constant voltage.
2. The system of claim 1 wherein the voltage supply winding is substantially enclosed in the first isolation box.
3. The system of claim 1 wherein the voltage supply winding is substantially enclosed in the second isolation box.
4. The system of claim 1 wherein the constant voltage is electric ground.
5. The system of claim 1 wherein one of the one or more first metal boards is one of the one or more second metal boards.
6. The system of claim 1, and further comprising a switch connected to the input primary winding and biased to the constant voltage, the switch being configured to receive a control signal generated based on at least information associated with the feedback signal.