The assignee for this patent application is
Reporters obtained the following quote from the background information supplied by the inventors: "A read channel integrated circuit (IC) is one of the core electronic components in a modern hard disk drive. In a magnetic recording system, for example, a read channel converts and encodes data to enable magnetic recording heads to write data to a magnetic medium and to then read back the data accurately. The magnetic media in a magnetic recording system have a number of tracks and each track comprises 'read' sectors, with 'servo' sectors embedded between the read sectors. The information recorded in the servo sectors helps to position a magnetic recording head so that the user information stored in the read sectors can be retrieved properly.
"The servo and read sectors both typically begin with the same known preamble pattern. The read preamble is followed by a read address mark and encoded user data. The servo preamble is followed by a servo address mark and various servo data, including encoded Gray data (often referred to as servo data).
"U.S. patent application Ser. No. 13/281,923, filed
"A need therefore exists for improved techniques for detecting servo sector data in a magnetic recording system."
In addition to obtaining background information on this patent application, VerticalNews editors also obtained the inventor's summary information for this patent application: "Illustrative embodiments of the invention provide methods and apparatus for improved detection of servo sector data in a magnetic recording system using single bit error correction. According to one embodiment of the invention, servo sector data is processed in a magnetic recording system by detecting the servo sector data; determining whether a single bit error occurred in the detected servo sector data; and flipping a bit value of an individual bit in the detected servo sector data having a lowest amplitude sample among the samples of the detected servo sector data when a single bit error is detected in the detected servo sector data. For example, the bit value can be flipped by changing a binary value of one to a binary value of zero and changing a binary value of zero to a binary value of one.
"In one embodiment, a single bit error is detected by evaluating a parity bit associated with the detected servo sector data. In another embodiment, a single bit error is detected using system level information that indicates whether the servo sector data should have even or odd parity. In yet another embodiment, a single bit error is detected for a current servo sector based on whether servo sector data for one or more previous servo sectors have even or odd parity. The single bit error can also be detected by evaluating a parity of servo sector data on a track identified based on a burst demodulation field.
"A more complete understanding of embodiments of the present invention will be obtained by reference to the following detailed description and drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
"FIG. 1 illustrates a typical track format for recording servo sector information and read sector information on a magnetic medium;
"FIG. 2 illustrates a format for the servo sectors of FIG. 1 that incorporates embodiments of the present invention;
"FIG. 3 illustrates a format for the RRO data field of FIG. 2;
"FIG. 4 is a block diagram illustrating a magnetic recording system in which embodiments of the present invention can be employed;
"FIG. 5 illustrates a waveform comprising asynchronous sample points and interpolated sample points; and
"FIG. 6 is a flow chart describing a servo sector data detection process according to one embodiment of the invention."
For more information, see this patent application: Annampedu, Viswanath. Methods and Apparatus for Improved Detection of Servo Sector Data Using Single Bit Error Correction. Filed
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