New Tricks: disk space management tools in Linux

Article Title: a beginner: Linux system disk space management tool. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.

1. fdisk-l

Disk/dev/sda: 120.0 GB, 120034123776 bytes => hard Disk capacity: 120 GB

255 heads, 63 sectors/track, 14593 cylinders => 255 heads, 63 sectors, 14593 cylinders

Units = cylinders of 16065*512 = 8225280 bytes => the capacity of each cylinders is 8225280

=> Storage capacity = number of tracks (cylinders) X number of magnetic heads X number of sectors X number of bytes per sector

14593x255x63x512 = 111.788G

Cylindrical capacity = number of cores x number of sectors X number of bytes per sector x 255x63x512 = 8225280 B

In fact, hard disk manufacturers generally calculate according to 1G = 1000

Disk identifier: 0xc3ffc3ff

Device Boot Start End Blocks Id System => start indicates that a partition starts from X cylinder.

/Dev/sda1*1 3824 30716248 + 7 HPFS/NTFS

/Dev/sda2 3825 10199 51200000 7 HPFS/NTFS

/Dev/sda3 10200 12596 19253902 + 5 Extended

/Dev/sda4 12597 14593 16040902 + 12 Compaq diagnostics

/Dev/sda5 10200 10211 96358 + 83 Linux

/Dev/sda6 10212 10454 1951866 82 Linux swap/Solaris

/Dev/sda7 10455 11548 8787523 + 83 Linux

/Dev/sda8 11549 12596 8418028 + 83 Linux

2. df: This command can be used to view the disk usage and the location where the file system is mounted.

Filesystem 1K-blocks Used Available Use % Mounted on

/Dev/sda7 8649544 1986948 6223220 25%/

Tmpfs 1033648 0 1033648 0%/lib/init/rw

Udev 10240 136 10104 2%/dev

Tmpfs 1033648 0 1033648 0%/dev/shm

/Dev/sda5 93307 19997 68493 23%/boot