1. A data storage device, comprising
a disk including a data area for storage of user data;
a head that makes access to the data area; and
a mechanism that supports the head, and moves the head, wherein
the disk includes:
a servo area that stores servo data that is read to the head for positioning of the head, and includes a plurality of bursts; and
an AC erase area that is subjected to AC erase asynchronously with a frequency three times or higher than a frequency of the bursts.
2. The data storage device according to claim 1, wherein
the disk includes the plurality of bursts each with a space in a radius direction, and the space between the bursts is subjected to the AC erase with the frequency three times or higher than the frequency of the bursts.
3. The data storage device according to claim 1, wherein
the AC erase area is subjected to the AC erase with a frequency five times or higher than the frequency of the bursts.
4. A method of writing a servo pattern on a recording surface of a rotating disk using a head including a read element and a write element disposed at each different position in a radius direction, wherein
the disk is rotated twice or more before the servo pattern on the recording surface is read by the read element and the write element is moved to an area not yet written with the servo pattern, a track is subjected to AC erase using the write element, and the write element is moved to a position of the track and then to another position of the track, and
an area subjected to the AC erase is written with the servo pattern using the write element.
5. The method according to claim 4, wherein
at the position of the track, the AC erase is performed by the write element on an intermittent basis.
6. The method according to claim 4, wherein
the servo pattern plurally provided each with a space in a circumferential direction are read using the read element, and the write element is subjected to positioning at the position of the track, and
in a period of reading the servo patterns for control over the positioning, the AC erase by the write element is stopped.
7. The method according to claim 5, wherein
the control over the positioning using a part of the servo patterns is skipped, and in a duration of skipping, the AC erase is performed using the write element.
8. A method of writing a servo pattern on a recording surface of a rotating disk using a head including a read element and a write element disposed at each different position in a radius direction, wherein
the servo pattern on the recording surface is read by the read element, and the write element is moved to an area not yet written with the servo pattern,
the servo pattern plurally provided each with a space in a circumferential direction are read by the read element, and the write element is positioned at a position of a track,
at the positioned position of the track, AC erase is performed by the write element on an intermittent basis, and
to an area subjected to the AC erase, the servo patterns are written using the write element.
9. The method according to claim 8, wherein
at the position of the track, the AC erase is stopped while the servo pattern is read for control over the positioning.
10. The method according to claim 9, wherein
after the AC erase is started by the write element, the disk is rotated twice or less before an entire area is subjected to the AC erase at the position of the track.
11. The method according to claim 8, wherein
the AC erase is asynchronously performed, and a frequency for the AC erase is three times or higher than a frequency of a burst included in the servo pattern.
12. A method of writing a servo pattern on a recording surface of a magnetic disk of vertical magnetic recording using a head including a read element and a write element, wherein
an area for use for measuring head characteristics is at least partially subjected to DC erase using the write element,
the head characteristics are measured using a read signal of the read element in the area subjected to DC erase, and
after the head characteristics are measured, a process is repeated to perform AC erase using the write element, to write the servo pattern using the write element to an area subjected to the AC erase, and to position the head using the read signal of the read element of the servo pattern.
13. The method according to claim 12, wherein
the head characteristics are measured, using the read element, by reading a base noise of the area subjected to the DC erase using the write element.
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 monitor system allowing a user to observe himself or herself while seated in a chair having a base and a seat pivotally attached to said base, comprising:
a. a video camera;
b. camera mounting means for fixing the location and orientation of said video camera, so that said video camera can be pointed toward said user when said user is sitting on said seat;
c. a monitor, including
i. communications means for receiving a video signal from said video camera;
ii. display means for displaying said video signal as a visible image; and
d. monitor mounting means, configured to attach said monitor to said chair, so that said monitor pivots in unison with said seat.
2. A monitor system as recited in claim 1, wherein said monitor mounting means comprises:
a. a beam linked to said seat so as to pivot in unison with said seat;
b. an upright, extending upward from said beam; and
c. an attachment between said upright and said monitor.
3. A monitor system as recited in claim 2, further comprising:
a. a lower pivot connecting said upright to said beam so that said upright can pivot with respect to said beam; and
b. a lower pivot lock for locking said lower pivot in a desired position.
4. A monitor system as recited in claim 2, further comprising:
a. a slide joint within said upright for adjusting the length of said upright; and
b. a slide joint lock for locking said slide joint.
5. A monitor system as recited in claim 2, further comprising:
a. wherein said attachment between said upright and said monitor is an upper pivot allowing said monitor to pivot with respect to said upright; and
b. an upper pivot lock for locking said upper pivot in a desired position.
6. A monitor system as recited in claim 2, wherein said upright includes a dogleg offset.
7. A monitor as recited in claim 1, wherein said communications means comprises a cable.
8. A monitor as recited in claim 1, wherein said communications means comprises a wireless transmitter and a wireless receiver.
9. A monitor as recited in claim 1, wherein said camera mounting means includes a strap allowing said user to hold said camera using a hand of said user.
10. A monitor as recited in claim 1, wherein:
a. said camera mounting means includes
i. an elevation drive for adjusting the elevation of said video camera;
ii. a pan drive for adjusting the rotation of said video camera about a vertical axis;
b. said monitor includes
i. an elevation control for activating said elevation drive; and
ii. a pan control for activating said pan drive.
11. A monitor as recited in claim 1, wherein:
a. said video camera includes a zoom drive; and
b. said monitor includes a zoom control for activating said zoom drive.
12. A monitor as recited in claim 1, wherein:
a. said camera mounting means includes a pitch drive; and
b. said monitor includes a pitch control for activating said pitch drive.
13. A monitor as recited in claim 1, wherein:
a. a second video camera is mounted on said monitor and directed toward said user; and
b. said visible image on said monitor assumes the form of a split screen, with a first portion displaying the output of said video camera and a second portion displaying the output of said second video camera.
14. A monitor system as recited in claim 3, further comprising:
a. a slide joint within said upright for adjusting the length of said upright; and
b. a slide joint lock for locking said slide joint.
15. A monitor system as recited in claim 3, further comprising:
a. wherein said attachment between said upright and said monitor is an upper pivot allowing said monitor to pivot with respect to said upright; and
b. an upper pivot lock for locking said upper pivot in a desired position.
16. A monitor system as recited in claim 4, further comprising:
a. wherein said attachment between said upright and said monitor is an upper pivot allowing said monitor to pivot with respect to said upright; and
b. an upper pivot lock for locking said upper pivot in a desired position.
17. A monitor system as recited in claim 1, wherein said monitor is detachable from said monitor mounting means.
18. A monitor system as recited in claim 17, wherein said monitor includes a handle allowing said user to easily hold said monitor.
19. A monitor system as recited in claim 3, wherein said upright includes a dogleg offset.
20. A monitor system as recited in claim 4, wherein said upright includes a dogleg offset.