Linux commands (25) Disk Management commands (iii) FDISK

I. Description of FDISK command

FDISK is a partition management tool under Linux, and it is a type of tool software such as partition Assistant under Windows. Anyone who has a sub-zone installed operating system knows that hard disk partitioning is necessary and important. The Help for Fdisk is as follows:

 [[email protected] hk]# fdisk/dev/sdbwelcome to fdisk (Util-linux 2.23.2). Changes'll remain in memory only, until the decide to write them. Be careful before using the Write command. Device does not contain a recognized partition tablebuilding a new DOS disklabel with disk identifier 0xb7af7b64. Command (M for help): Hh:unknown Commandcommand Action A toggle a bootable flag B edit BSD Disklabel c toggle The DOS Compatibility flag d Delete a partition G create a new empty GPT partition Table G Create an IRIX (SG I) partition table l list known partition types m print this menu n add a new partition O create a new emp Ty DOS partition table p print the partition table Q quit without saving changes s create a new empty Sun disk Label T change a partition ' s system ID u change display/entry units v Verify the partition table W write t Able to disk and exit X extra functionality (experts only) 

The parameters used in the above parameters are described:

Second, hard disk detailed partition and mount process complete demonstration

# view partition information first [[email protected] hk]# fdisk-ldisk/dev/sda:42.9 GB, 42949672960 bytes, 83886080 sectorsunits = sectors O F 1 * bytessector size (logical/physical): bytes/512 bytesi/o size (minimum/optimal): bytes/512 byte   Sdisk label Type:dosdisk IDENTIFIER:0X000C44FB Device Boot Start End Blocks Id system/dev/sda1 * 2048 2099199 1048576 linux/dev/sda2 2099200 83886079 40893440 8e Linux lvm# here/de V/sdb for unused partitions disk/dev/sdb:1073 MB, 1073741824 bytes, 2097152 sectorsunits = sectors of 1 * = bytessector size (l  ogical/physical): bytes/512 bytesi/o size (minimum/optimal): bytes/512 bytesdisk/dev/mapper/cl-root:39.7 GB, 39720058880 bytes, 77578240 sectorsunits = sectors of 1 * MB = bytessector size (logical/physical): bytes/512 BYTESI/O size (minimum/optimal): bytes/512 bytesdisk/dev/mapper/cl-swap:2147 MB, 2147483648 bytes, 4194304 sectors Units = sectors of 1 * 5Bytessector size (logical/physical): bytes/512 bytesi/o size (minimum/optimal): Up to bytes/512 bytes# started partition [[email protected] hk]# fdisk/dev/sdbwelcome to fdisk (Util-linux 2.23.2). Changes'll remain in memory only, until the decide to write them. Be careful before using the Write command. Device does not contain a recognized partition tablebuilding a new DOS disklabel with disk identifier 0xca00a0b9.# M view Help Co Mmand (M for help): Mcommand action A toggle a bootable flag B edit BSD Disklabel c toggle the DOS Compatibili   Ty Flag D Delete a partition G create a new empty GPT partition Table G Create an IRIX (SGI) partition table L list known partition types m print this menu n add a new partition o create a new empty DOS partition tab  Le 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) # Create a new partition Command (M for help): N Partition Type:p Primary (0 primary, 0 extended, 4 free) e Extended # p means the primary partition is created and E represents the extended partition select (Default p): Ppart  Ition number (1-4, default 1): 1 # select 1 or Use default first sector (2048-2097151, default 2048): # Start section using default    Value 2048# +400m represents allocating 400M space to a partition, the default allocation of all remaining space on the disk last sector, +sectors or +size{k,m,g} (2048-2097151, default 2097151): +400m Partition 1 of type Linux and of size set# MiB is to use W Save command (M for help): wthe Partition table have been altere D! Calling IOCTL () to re-read partition table. Syncing disks. #查看分区情况 [[email protected] hk]# fdisk-ldisk/dev/sda:42.9 GB, 42949672960 bytes, 83886080 sectorsunit s = sectors of 1 * bytessector size (logical/physical): bytes/512 bytesi/o size (minimum/optimal): byt    es/512 bytesdisk label Type:dosdisk identifier:0x000c44fb Device Boot Start End  Blocks Id system/dev/sda1 * 2048 2099199 1048576 2099200 83886079 40893440 8e Linux lvmdisk/dev/sdb:1073 MB, 1073741824 bytes, 2097152 sectorsunits = sectors of 1 * = Bytesse ctor Size (logical/physical): bytes/512 bytesi/o size (minimum/optimal): bytes/512 bytesdisk label TYPE:DOSDI SK identifier:0xca00a0b9# This is the partition that we just allocated Device Boot Start End Blocks Id system/dev/sdb1 2 048 821247 409600 linuxdisk/dev/mapper/cl-root:39.7 GB, 39720058880 bytes, 77578240 sectorsunits = Secto RS of 1 * The Bytessector size (logical/physical): bytes/512 bytesi/o size (minimum/optimal): bytes/512  bytesdisk/dev/mapper/cl-swap:2147 MB, 2147483648 bytes, 4194304 sectorsunits = sectors of 1 * = bytessector size (logical/physical): bytes/512 bytesi/o size (minimum/optimal): Up to bytes/512 bytes# format the newly created partition in ext3 format [[EMA Il protected] hk]#Mkfs-t ext3/dev/sdb1mke2fs 1.42.9 (28-dec-2013) Filesystem label=os type:linuxblock size=1024 (log=0) Fragment size=1024 (log=0) Stride=0 blocks, Stripe width=0 blocks102400 inodes, 409600 blocks20480 blocks (5.00%) reserved for the Super Userfirst da Ta block=1maximum filesystem blocks=6763315250 block groups8192 blocks per group, 8192 fragments per group2048 inodes per  Groupsuperblock backups stored on blocks:8193, 24577, 40961, 57345, 73729, 204801, 221185, 401409Allocating Group Tables:done Writing inode tables:done Creating Journal (8192 bloc KS): donewriting superblocks and filesystem accounting Information:done #创建挂载目录 [[email protected] hk]# mkdir/mnt/d isk2# Mount/dev/sdb1 to/mnt/disk2[[email protected] hk]# mount/dev/sdb1/mnt/disk2/# view partition is mounted properly [[email  Protected] hk]# df-hfilesystem Size used Avail use% mounted ONDEVTMPFS 463M 0 463M 0%/devt    MPFS 488M 0 488M 0%/dev/shmtmpfs 488M 13M 475M 3%/runtmpfs 488M 0 488M 0%/SYS/FS/CG     Roup/dev/mapper/cl-root 37G 3.6G 34G 10%//dev/sda1 1014M 246M 769M 25%/boottmpfs 98M  0 98M 0%/run/user/1000/dev/sdb1 380M 2.3M 358M 1%/mnt/disk2 #这里可以看见分区已经正常挂载 # Edit system Partition Table/etc/fstab Enable Auto-mount [[email protected] hk]# Vim/etc/fstab #/etc/fstab# Created by Anaconda on Tue Nov-20:59:37 2017## acce Ssible filesystems, by reference, is maintained under '/dev/disk ' # See mans Pages Fstab (5), Findfs (8), mount (8) and/or BLK ID (8) For more INFO#/DEV/MAPPER/CL-ROOT/XFS defaults 0 0uuid=03cf4f74-827e-40a1-a67    F-2227be43dee7/boot XFS defaults 0 0/dev/mapper/cl-swap swap Swap Defaults 0 0/dev/sdb1/mnt/disk2 ext3 default 0 0 # Add the partition information to the end of the/etc/fstab file, save and exit # Switch to the partition mounted directory, create a file test partition can with [[email protected] hk]# cd/mnt/disk2/[[email protected] disk2]# touch test.txt[[email protected] disk2]# lslost+found test.txt 

Linux Commands (25) Disk Management commands (iii) FDISK