Magnetic disk apparatus of constant-density recording type, magnetic disk used therefor and servo-writing device for patterning on the magnetic disk

摘要: A constant-density type of magnetic disk apparatus is made up a plurality disks, wherein at least one the surfaces disks servo face divided into zones in radial direction disks. used this and servo-writing device for making are also disclosed. In disk, information regions clock alternately provided on circumferential The arranged radially with respect to rotation center each includes transitions representative clocks, number which different zones. PLL circuit generate signal basis reproduced from regions, write regions. Also disclosed use constant density-recording apparatus, dummy track along zone boundary data embedded patterns disk.