天天学一个 Linux 命令（78）：fdisk
命令简介
fdisk 命令用于查看磁盘使用状况和磁盘分区，它可用于建立，删除和修改磁盘分区。ui
语法格式
disk [-uc] [-b sectorsize] [-C cyls] [-H heads] [-S sects] device
选项说明
-b <大小> #扇区大小(5十二、102四、2048或4096) -c[=<模式>] #兼容模式：“dos”或“nondos”(默认) -h #打印此帮助文本 -u[=<单位>] #显示单位：“cylinders”(柱面)或“sectors”(扇区，默认) -v #打印程序版本 -C <数字> #指定柱面数 -H <数字> #指定磁头数 -S <数字> #指定每一个磁道的扇区数
应用举例
选择要进行操做的磁盘this
[root@localhost ~]$ fdisk /dev/sdb
输入 m 查看可执行的命令spa
command (m for help): m Command action a toggle a bootable flag b edit bsd disklabel c toggle the dos compatibility flag d delete a partition l list known partition types m print this menu n add a new partition o create a new empty DOS partition table p print the partition table q quit without saving changes s create a new empty Sun disklabel t change a partition's system id u change display/entry units v verify the partition table w write table to disk and exit x extra functionality (experts only)
输入 p 列出磁盘目前的分区状况code
Command (m for help): p Disk /dev/sdb: 3221 MB, 3221225472 bytes 255 heads, 63 sectors/track, 391 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 1 1 8001 8e Linux LVM /dev/sdb2 2 26 200812+ 83 Linux
输入 d 而后选择分区，删除现有分区ci
Command (m for help): d Partition number (1-4): 1 Command (m for help): d Selected partition 2
查看分区状况，确认分区已经删除it
Command (m for help): print Disk /dev/sdb: 3221 MB, 3221225472 bytes 255 heads, 63 sectors/track, 391 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System Command (m for help):
输入 n 创建新的磁盘分区，首先创建两个主磁盘分区io
Command (m for help): n Command action e extended p primary partition (1-4) p #创建主分区 Partition number (1-4): 1 #分区号 First cylinder (1-391, default 1): #分区起始位置 Using default value 1 last cylinder or +size or +sizeM or +sizeK (1-391, default 391): 100 #分区结束位置，单位为扇区 Command (m for help): n #再创建一个分区 Command action e extended p primary partition (1-4) p Partition number (1-4): 2 #分区号为2 First cylinder (101-391, default 101): Using default value 101 Last cylinder or +size or +sizeM or +sizeK (101-391, default 391): +200M #分区结束位置，单位为M
确认分区创建成功table
Command (m for help): p Disk /dev/sdb: 3221 MB, 3221225472 bytes 255 heads, 63 sectors/track, 391 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 1 100 803218+ 83 Linux /dev/sdb2 101 125 200812+ 83 Linux
再创建一个逻辑分区ast
Command (m for help): n Command action e extended p primary partition (1-4) e #选择扩展分区 Partition number (1-4): 3 First cylinder (126-391, default 126): Using default value 126 Last cylinder or +size or +sizeM or +sizeK (126-391, default 391): Using default value 391
确认扩展分区创建成功function
Command (m for help): p Disk /dev/sdb: 3221 MB, 3221225472 bytes 255 heads, 63 sectors/track, 391 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 1 100 803218+ 83 Linux /dev/sdb2 101 125 200812+ 83 Linux /dev/sdb3 126 391 2136645 5 Extended
在扩展分区上创建两个逻辑分区
Command (m for help): n Command action l logical (5 or over) p primary partition (1-4) l #选择逻辑分区 First cylinder (126-391, default 126): Using default value 126 Last cylinder or +size or +sizeM or +sizeK (126-391, default 391): +400M Command (m for help): n Command action l logical (5 or over) p primary partition (1-4) l First cylinder (176-391, default 176): Using default value 176 Last cylinder or +size or +sizeM or +sizeK (176-391, default 391): Using default value 391
确认逻辑分区创建成功
Command (m for help): p Disk /dev/sdb: 3221 MB, 3221225472 bytes 255 heads, 63 sectors/track, 391 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 1 100 803218+ 83 Linux /dev/sdb2 101 125 200812+ 83 Linux /dev/sdb3 126 391 2136645 5 Extended /dev/sdb5 126 175 401593+ 83 Linux /dev/sdb6 176 391 1734988+ 83 Linux Command (m for help):
保存操做信息
Command (m for help): w The partition table has been altered! Calling ioctl() to re-read partition table. Syncing disks.
创建好分区以后咱们还须要对分区进行格式化才能在系统中使用磁盘。这个格式化命令后面的章节会给你们进行详细讲解。
