2.5. SM Display with Multi-zone Disks

Over the past few years, magnetic recording areal density has increased at the rate of 60% per year from increases in both bits per inch (bpi) and tracks per inch (tpi) [121], [82], [33]. Bits per inch (called linear density) shows how many bits can be stored on a track, i.e., the number of sectors on a track. To meet the demands for a higher storage capacity, disk drive manufacturers have invariably introduced disks with zones. A zone is a contiguous collection of disk cylinders whose tracks have the same storage capacity, i.e., the number of sectors per track is constant in the same zone (ZBR technique). Tracks are longer towards the outer portions of a disk platter as compared to the inner portions, hence, ...

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