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Zone bit recording
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Zone Bit Recording (ZBR) is used by disk drives to store more sectors per track on outer tracks than on inner tracks. It is also called Zone Constant Angular Velocity (Zone CAV or Z-CAV or ZCAV).
On a disk consisting of concentric tracks, the physical track length increases with distance from the center hub. Therefore, holding storage density constant, the track storage capacity likewise increases with distance from the center.
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Zone Bit Recording (ZBR) is used by disk drives to store more sectors per track on outer tracks than on inner tracks. It is also called Zone Constant Angular Velocity (Zone CAV or Z-CAV or ZCAV).
On a disk consisting of concentric tracks, the physical track length increases with distance from the center hub. Therefore, holding storage density constant, the track storage capacity likewise increases with distance from the center.
ZBR is a compromise between CLV (which packs the most bits onto a disk, but has very slow seek times) and CAV (which has faster seek times, but stores fewer bits on a disk).
To implement ZBR, a drive's controller varies the rate at which it reads and writes - faster on outer tracks.
One side effect of ZBR is the raw data transfer rate of the disk when reading the outside tracks is much higher -- in some disks, about double -- the data transfer rate of the same disk when reading the "inner" (closest to the hub) tracks.
Products that use ZBR/ZCAV
See also
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