Measurement of disc servo head/data head misalignment
Head positioning mechanism for rotating disk data storage system
Head position control system with multiple servo areas staggered on various disks
Head position control system
Servo pattern writing method for a disk storage device
Track access control system for magnetic disk system with periodic track offset update Patent #: 5109306
ApplicationNo. 591910 filed on 10/02/1990
US Classes:360/78.14, By recorded servo reference or address signal360/77.05, By servo signal component from carrier surface separate from information signal bearing surface360/77.07, By tracking signal recorded on or immediately beneath surface360/77.11Continuous servo signal
ExaminersPrimary: Psitos, Aristotelis M.
Assistant: Sheladia, Varsha V.
Attorney, Agent or Firm
Foreign Patent References
International ClassesG11B 005/596
AbstractA transducer head skew arrangement used in a multiple disk drive data storage system is provided. The disk drive unit includes a plurality of magnetic disk surfaces mounted for simultaneous rotation about an axis. A first sequence of servo information tracks are arrayed on a dedicated servo disk surface. At least one servo reference track is written on each data disk surface for storing servo reference information. The servo reference track is written on a first data disk surface aligned with a predefined servo information track on the dedicated servo disk surface. Then servo reference tracks are sequentially written on each successive consecutive data disk surface progressively offset radially from the last written servo reference track. A plurality of data information tracks for storing data are disposed at predetermined positions relative to the servo reference track on each the data disk surface. A servo transducer head is mounted for movement in a radial direction across the first dedicated servo information for reading servo information; and a plurality of data transducer heads are mounted for movement with the servo transducer head in a radial direction across the disk surfaces for reading the servo reference tracks and for reading and/or writing data to the data information tracks. The distance moved by transducer heads for a cylinder switch is the same distance moved for each head switch, so that track-to-track seek time is minimized without requiring any additional time delay for each head switch. An overall data transfer rate increases for every data transfer accessing more than one data cylinder.
Field of SearchBy recorded servo reference or address signal
Controlling the head
By memory storage of repeatable error or correction
By servo signal component from carrier surface separate from information signal bearing surface
By tracking signal recorded on or immediately beneath surface
Continuous servo signal
For rotary carrier (e.g., disc)
Locating specific areas
Responsive to recorded address