Optical disk having formatted coarse servo tracks

Details Optical disk having formatted coarse servo tracks Optical disk having formatted coarse servo tracks

G - Physics

11

B

352/32.4

G11B 7/007 (2006.01)

Patent

CA 1242273

ABSTRACT OF THE DISCLOSURE A disk for storage of data in tracks thereon, data being written onto and read from said tracks during rotation of said disk about a central axis, said disk comprising: a first band of plurality of first coarse servotracks concentric with said axis and radially spaced apart one from the other, a first circumferential portion of each of said first servotracks having an integral number of equi-spaced readable first marks therearound, said first marks dividing said first servotracks into a selected number of sectors of equal angular arc, said first marks and sectors being radially aligned from track to track relative to said central axis,a second circumferential portion of each said first servotrack including an index patern of index marks, the beginnings of said index paterns on each said first servotrack being in radial alignment, said index marks distinctively marking said disk to provide a reference for numbering of said sectors around said tracks; and a second band of a plurality of second coarse servotracks concentric with said axis and radially spaced apart one from the other, said second band being radially spaced from said band, the entire circumference of said plurality of second servotracks having an integral number of equi-spaced readable second marks written therearound, said second marks being spaced to divide said second servotracks into said sectors of equal angular arc, said second marks creating sectors in alignment with said sectors produced by said first marks.

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