Pulsed write current adapted for use with a field maintenance current in a data storage device
AssigneeSeagate Technology LLC
InventorHousan Dakroub
Life of this patent
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Abstract
An apparatus and method for writing data to a magnetizable recording medium in the form of spaced-apart magnetic flux transitions forming magnetization vectors having alternating magnetic orientations and selected lengths. A write element adjacent the medium includes a leading edge and a trailing edge forming a write gap which, when the write element is activated by an electric current, provides a write field for selectively magnetizing the magnetizable medium. A write driver circuit is responsive to a data input stream in providing a write current activating the write element, the write current comprising a pulse current in a phased relationship with a continuous current.
Claims10
A method for using a data storage device including a write element responsive to a write current for magnetically recording data to a magnetizable medium in the device as a sequence of magnetic flux transitions, the method comprising steps of:
- (a) generating a write field with the write element;
- (b) moving the magnetizable medium through the write field;
- and
- (c) adapting the write current responsive to a data stream input for activating the write element to magnetically orient a first area of the medium in a first direction, the write current comprising a pulse current in a predetermined phase relationship with a continuous current, and reversing the write current in response to the data stream input to magnetically orient a second area of the medium in a second direction, whereas the reversing of the write current is implemented such that a steady-state current does not occur during the reversal of the write current.
A data handling device adapted for receiving a data input stream from a host computer and storing the data, comprising:
- a rotatable disc having a magnetizable medium storing the data as several sequential magnetization vectors in an alternating magnetic orientation;
- a write element operably adjacent the disc generating a write field for selectively magnetizing the magnetizable medium;
- a write driver circuit adaptively responsive to the data input stream and imparting a write current to the write element to magnetically orient the magnetizable medium in a magnetically oriented first direction when writing the data input stream to the disc, the write driver circuit comprising:
- a first source responsive to the data input stream for imparting a continuous current to the write element;
- a second source responsive to the data input stream for imparting a pulse current to the write element;
- a delay timer phasing the responses of the first and second sources;
- the write driver circuit being further configured to reverse the write current in response to the data input stream to impart a second area of the magnetizable medium in a magnetically oriented second direction, the write driver circuit configured such that a steady-state current does not occur during the reversal of the write current.
Dependencies are inferred from the claim text.