(operating Systems Capabilities File Systems Reality: Disks are sets of tracks(磁道) Tracks are sets of sectors(扇区) Sectors can store fixed- sized byte blocks illusion: Disks are sets of directories(目录) Directories contain other directories or files Files are variable- size byte sequences Directories and files have namesHUANG Lihua, Fudan University Operating Systems Capabilities: File Systems • Reality: – Disks are sets of tracks(磁道） – Tracks are sets of sectors（扇区） – Sectors can store fixed- sized byte blocks • Illusion: – Disks are sets of directories （目录） – Directories contain other directories or files – Files are variable- size byte sequences – Directories and files have names