Patent ID: 7408731
Filing Date: 2008-08-05
Classification: G11B

Abstract:
1. A track allocation method of a disk drive, the disk drive comprising: a storage medium and a controller sending and receiving commands and data to and from a high-order device and performing writing control or reading control over said storage medium; wherein said storage medium is divided into a plurality of zones having different numbers of sectors for each track; wherein there exist a first track group having a first track width and a second track group having a second track width on said storage medium; and wherein, when areas of said first track group and said second track group are secured in said zone, said controller executes the steps of: dividing said zone into a first area for said first track group and a second area for said second track group based on a capacity ratio of said first track group to said second track group to be secured in said zone or based on a first initial value of the capacity of said first track group and a second initial value of the capacity of said second track group; allocating said first track group to said first area; transferring an area lacking because of a defective track from said second area to said first area when there exists the defective track causing prohibition of use of the entire track in said first area; and allocating said second track group to said second area.