Method and apparatus for recording servo frame, storage disk, and method and apparatus for obtaining servo frame information
A servo-frame recording apparatus includes: a sector information rearranging section for rearranging serial bits of the sector information that is binary data; a first ExOR section for performing the ExOR (exclusive OR) on the sector information, the serial bits of which have been rearranged by said sector information rearranging section, and the track information, so that an exclusive logical sum is obtained; and a writing section for wiring the exclusive logical sum obtained by said ExOR section into the servo frame. With this configuration, a data length required for recording gray information and sector information can be shortened without lowering the reliability of a magnetic disk.
1. A method for recording sector information and track information into a servo frame on a storage disk, comprising the steps of:
(a) inverting serial bits of the sector information that is binary data;
(b) generating the track information by converting a cylinder number in the form of binary data into a gray code as a result of performing an exclusive OR (ExOR);
(c) obtaining an exclusive logical sum of the sector information, the serial bits of which have been inverted in said step (a) of inverting, and the track information generated in said step of (b); and
(d) writing the exclusive logical sum obtained in said step (b) of obtaining into the servo frame.
2. A method according to claim 1 further comprising the step of (e) rearranging serial bits of the track information that is binary data,
said step (c) of obtaining obtains the exclusive logical sum using the sector information, the serial bits of which have been inverted in said step (a) of inverting, and the track information, the serial bits of which have been rearranged in said step (e) of rearranging.
3. An apparatus for recording sector information and track information into a servo frame on a storage disk, comprising:
a sector information inverting section for inverting serial bits of the sector information that is binary data;
a gray code converting section for generating the track information by converting a cylinder number in the form of binary data into a gray code as a result of performing an exclusive OR (ExOR);
an ExOR section for performing an ExOR (exclusive OR) on the sector information, the serial bits of which have been inverted by said sector information inverting section, and the track information generated by said gray code converting section, so that an exclusive logical sum is obtained; and
a writing section for writing the exclusive logical sum obtained by said ExOR section into the servo frame.
4. An apparatus according to claim 3 , further comprising a track information rearranging section for rearranging serial bits of the track information that is binary data,
said ExOR section performing the ExOR on the sector information, the serial bits of which have been inverted by said sector information inverting section, and the track information, the serial bits of which have been rearranged by said track information rearranging section.
5. A storage disk on which sector information and track information is recorded into a servo frame formed on the disk, wherein
an exclusive logical sum of the sector information that is serial binary data which has been inverted and the track information that is generated by converting a cylinder number in the form of binary data into a gray code as a result of performing an exclusive OR (ExOR) is recorded in the servo frame.
6. A storage disk according to claim 5 , wherein the track information that is serial binary data is rearranged and is recorded in the form of the exclusive logical sum obtained in conjunction with the sector information that has been inverted into the servo frame.
7. A method for obtaining servo frame information serving as combined data generated by combining sector information and track information from a storage disk on which the combined data is recorded into a servo frame formed on the disk, comprising the steps of:
(a) obtaining the combined data from the servo frame;
(b) inverting serial bits of the sector information that is binary data; and
(c) performing an ExOR on the combined data obtained in said step (a) of obtaining and the sector information, the serial bits of which have been inverted in said step (b) of inverting, in order to generate a gray code, and converting the gray code into a cylinder number in the form of binary data that is to be used as the track data.
8. A method according to claim 7 further comprising the step of (d) rearranging serial bits of the track information that is binary data, which track information has been generated in said step (c) of performing, to restore the track information.
9. An apparatus for obtaining servo frame information serving as combined data generated by combining sector information and track information from a storage disk on which the combined data is recorded into a servo frame formed on the disk, comprising:
a combined data obtaining section for obtaining the combined data from the servo frame;
a sector information inverting section for inverting serial bits of the sector information that is binary data; and
an ExOR section for performing an ExOR on the combined data obtained by said combined data obtaining section and the sector information, the serial bits of which have been inverted by said sector information inverting section, so that a gray code is generated, and converting the gray code into a cylinder number in the form of binary data that is used as the track information.
10. An apparatus according to claim 9 further comprising a track information restoring section for restoring the track information by rearranging serial bits of the track information that is binary data which track information has been obtained by said ExOR section.