Flexible data TPI in hard disk drives
A hard disk drive with a disk that has a plurality of servo sections and a plurality of data sections. At least some of the data sections have a track density different than the track density of the servo sections. The disk drive has a controller that may convert a data track number to a servo track number to compensate for the different densities. The conversion may be required to conduct a seek routine to access a data track associated with the data track number.
1 . A hard disk drive, comprising:
a disk that has a plurality of servo tracks at a servo track density, and a plurality of data tracks, at least some of said data tracks having a data track density different than said servo track density;
a spindle motor that rotates said disk;
a plurality of heads coupled to said disk including a first head and a second head;
an actuator arm coupled to said heads;
a voice coil motor coupled to said actuator arm; and, a controller coupled to said heads said controller converts a data track number to a servo track number in accordance with a conversion function that varies as a function of a head number, said first head having a first servo track number that is different than a second servo track number of said second head.
2 . (canceled)
3 . (canceled)
4 . The disk drive of claim 1 , wherein said conversion function is a linear function.
5 . The disk drive of claim 1 , wherein said conversion function varies as a function of an area of said disk.
6 . (canceled)
7 . (canceled)
8 . (canceled)
9 . (canceled)
10 . (canceled)
11 . (canceled)
12 . A hard disk drive, comprising:
a disk that has a plurality of servo tracks at a servo track density, and a plurality of data tracks, at least some of said data tracks having a data track density different that said servo track density, said servo tracks having a plurality of servo track numbers and said data tracks having a plurality of data track numbers;
a spindle motor that rotates said disk;
a plurality of heads coupled to said disk including a first head and a second head;
an actuator arm coupled to said heads means;
a voice coil motor coupled to said actuator arm; and,
conversion means for converting one of the data track numbers to one of the servo track numbers to move said heads and access a data track in accordance with a conversion function that varies as a function of a head number, said first head having a first servo track number that is different than a second servo track number of said second head.
13 . (canceled)
14 . The disk drive of claim 12 , wherein said conversion function is a linear function.
15 . The disk drive of claim 12 , wherein said conversion function varies as a function of an area of said disk.
16 . (canceled)
17 . A method for reading data on a disk of a hard disk drive that has a first head and a second head, comprising:
converting a data track number to a servo track number in accordance with a conversion function that is a function of a head number, the first head having a first servo track number that is different than a second servo track number of the second head;
moving the first head to a servo track having the first servo track number and the second head to a servo track having the second servo track number; and,
reading data in a data track that corresponds to the servo track numbers.
18 . (canceled)
19 . The method of claim 17 , wherein said conversion function is a linear function.
20 . The method of claim 17 , wherein said conversion function varies as a function of an area of said disk.
21 . (canceled)