磁盘构成 track t ndle arm assembly 盘面 Platter sector s 磁头Head 柱面 Cylinder 磁道 Track 扇区 Sector cylinder c→ read-write 块B1ock head rotation磁盘构成 盘面Platter 磁头Head 柱面Cylinder 磁道Track 扇区Sector 块Block