A method for collecting position information in a disk drive having a read head and a disk with a set of spirals formed thereon includes: while the read head crosses a first spiral included in the set of spirals, opening a first frame integration window; while the first frame integration window is open, generating first signals with the read head as the read head crosses over a first set of magnetic transitions; closing the first frame integration window; after closing the first frame integration window, generating second signals with the read head as the read head crosses over a second set of magnetic transitions; and determining a radial position of the read head by integrating amplitudes of the first signals, wherein the first set includes magnetic transitions having a first polarity, and the second set includes two or more magnetic transitions having a second polarity.

A method for collecting position information in a disk drive having a read head and a disk with a set of spirals formed thereon includes: while the read head crosses a first spiral included in the set of spirals, opening a first frame integration window; while the first frame integration window is open, generating first signals with the read head as the read head crosses over a first set of magnetic transitions; closing the first frame integration window; after closing the first frame integration window, generating second signals with the read head as the read head crosses over a second set of magnetic transitions; and determining a radial position of the read head by integrating amplitudes of the first signals, wherein the first set includes magnetic transitions having a first polarity, and the second set includes two or more magnetic transitions having a second polarity.

An apparatus includes a magnetic head having a first array of read transducers, an array of write transducers, and a second array of read transducers. A center-to-center pitch of the read transducers in the first array is less than a center-to-center pitch of the write transducers. A center-to-center pitch of the read transducers in the second array is greater than a center-to-center pitch of the write transducers. The read transducers in the first and second arrays are aligned with the write transducers along an intended direction of tape travel thereacross for enabling read-while-write operation.

Low-profile thermally stable lubricants for data storage devices are provided based on multi-dentate molecular designs. One such lubricant comprises perfluoroalkyl ether segments, a divalent linking segment, and anchoring functional groups attachable to, or engageable with, a protective overcoat of a magnetic recording medium. The lubricants can be used in conjunction with a magnetic recording medium and/or a magnetic data storage system.

Low-profile thermally stable lubricants for data storage devices are provided based on multi-dentate molecular designs. One such lubricant comprises perfluoroalkyl ether segments, a divalent linking segment, and anchoring functional groups attachable to, or engageable with, a protective overcoat of a magnetic recording medium. The lubricants can be used in conjunction with a magnetic recording medium and/or a magnetic data storage system.

According to one embodiment, a disk device includes a recording medium, a magnetic head, a ramp, and an actuator. The recording medium has a recording surface and is rotatable around a first rotation axis. The actuator includes a first portion extending so as to be separated from a second rotation axis and separated from the recording surface as the distance from the second rotation axis increases, holds the magnetic head, and is rotatable around the second rotation axis. A first support is provided on the ramp, extends around the second rotation axis, and can support the first portion so that the magnetic head is separated from the recording surface. A second support is provided on the ramp, is located between the first rotation axis and the first support, is separated from the second rotation axis farther than the first support, and can support the first portion.

According to one embodiment, a disk device includes a recording medium, a magnetic head, a ramp, and an actuator. The recording medium has a recording surface and is rotatable around a first rotation axis. The actuator includes a first portion extending so as to be separated from a second rotation axis and separated from the recording surface as the distance from the second rotation axis increases, holds the magnetic head, and is rotatable around the second rotation axis. A first support is provided on the ramp, extends around the second rotation axis, and can support the first portion so that the magnetic head is separated from the recording surface. A second support is provided on the ramp, is located between the first rotation axis and the first support, is separated from the second rotation axis farther than the first support, and can support the first portion.

According to one embodiment, a magnetic disk device includes a plurality of magnetic disks, a plurality of magnetic heads provided correspondingly to the plurality of magnetic disks and configured to carry out read/write of data from/to the magnetic disks, and a control section configured to control read/write of the magnetic heads. Each of the plurality of magnetic disks includes a first storage section storing therein control information concerning read/write of the magnetic head. The control section switches the first storage section which is a storage destination of first information that is at least a part of the control information from the magnetic disk to another magnetic disk.

According to one embodiment, a magnetic disk device includes a plurality of magnetic disks, a plurality of magnetic heads provided correspondingly to the plurality of magnetic disks and configured to carry out read/write of data from/to the magnetic disks, and a control section configured to control read/write of the magnetic heads. Each of the plurality of magnetic disks includes a first storage section storing therein control information concerning read/write of the magnetic head. The control section switches the first storage section which is a storage destination of first information that is at least a part of the control information from the magnetic disk to another magnetic disk.

A data storage medium includes a substrate, and a plurality of spaced-apart discrete data storage tracks supported by the substrate. The data storage medium also includes magnetic flux sinking material between the discrete data storage tracks and over the substrate. As an alternative to the magnetic flux sinking material, plasmonic material may be included between the discrete data storage tracks and over the substrate.