简单概括磁盘的存储原理
计算磁盘容量
Capacity = (# bytes/sector) x (avg. # sectors/track) x
(# tracks/surface) x (# surfaces/platter) x
(# platters/disk)
Example:
512 bytes/sector
300 sectors/track (on average)
20,000 tracks/surface
2 surfaces/platter
5 platters/disk
Capacity = 512 x 300 x 20000 x 2 x 5
= 30,720,000,000
= 30.72 GB