Linux 磁盘分区

[root@CGZ ~]# fdisk -l

Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00065f00

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        1913    15360000   83  Linux
/dev/sda2            1913        2174     2097152   82  Linux swap / Solaris
[root@CGZ ~]# fdisk /dev/sda1
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0xe7053300.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1912, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-1912, default 1912): +100M

Command (m for help): p

Disk /dev/sda1: 15.7 GB, 15728640000 bytes
255 heads, 63 sectors/track, 1912 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xe7053300

     Device Boot      Start         End      Blocks   Id  System
/dev/sda1p1               1          14      112423+  83  Linux

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 2
First cylinder (15-1912, default 15):
Using default value 15
Last cylinder, +cylinders or +size{K,M,G} (15-1912, default 1912): +200M

Command (m for help): p

Disk /dev/sda1: 15.7 GB, 15728640000 bytes
255 heads, 63 sectors/track, 1912 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xe7053300

     Device Boot      Start         End      Blocks   Id  System
/dev/sda1p1               1          14      112423+  83  Linux
/dev/sda1p2              15          40      208845   83  Linux

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 4
First cylinder (41-1912, default 41):
Using default value 41
Last cylinder, +cylinders or +size{K,M,G} (41-1912, default 1912): +300M

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Selected partition 3
First cylinder (80-1912, default 80):
Using default value 80
Last cylinder, +cylinders or +size{K,M,G} (80-1912, default 1912): +400M

Command (m for help): p

Disk /dev/sda1: 15.7 GB, 15728640000 bytes
255 heads, 63 sectors/track, 1912 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xe7053300

     Device Boot      Start         End      Blocks   Id  System
/dev/sda1p1               1          14      112423+  83  Linux
/dev/sda1p2              15          40      208845   83  Linux
/dev/sda1p3              80         131      417690   83  Linux
/dev/sda1p4              41          79      313267+  83  Linux

Partition table entries are not in disk order

Command (m for help): n
You must delete some partition and add an extended partition first

Command (m for help): d
Partition number (1-4): 4

Command (m for help): p

Disk /dev/sda1: 15.7 GB, 15728640000 bytes
255 heads, 63 sectors/track, 1912 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xe7053300

     Device Boot      Start         End      Blocks   Id  System
/dev/sda1p1               1          14      112423+  83  Linux
/dev/sda1p2              15          40      208845   83  Linux
/dev/sda1p3              80         131      417690   83  Linux

Command (m for help): d
Partition number (1-4): 3

Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
e
Partition number (1-4): 3
First cylinder (41-1912, default 41): 1400
Last cylinder, +cylinders or +size{K,M,G} (1400-1912, default 1912):
Using default value 1912

Command (m for help): n
Command action
   l   logical (5 or over)
   p   primary partition (1-4)
l
First cylinder (1400-1912, default 1400):
Using default value 1400
Last cylinder, +cylinders or +size{K,M,G} (1400-1912, default 1912):
Using default value 1912

Command (m for help): p

Disk /dev/sda1: 15.7 GB, 15728640000 bytes
255 heads, 63 sectors/track, 1912 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xe7053300

     Device Boot      Start         End      Blocks   Id  System
/dev/sda1p1               1          14      112423+  83  Linux
/dev/sda1p2              15          40      208845   83  Linux
/dev/sda1p3            1400        1912     4120672+   5  Extended
/dev/sda1p5            1400        1912     4120641   83  Linux

Command (m for help): l

 0  Empty           24  NEC DOS         81  Minix / old Lin bf  Solaris
 1  FAT12           39  Plan 9          82  Linux swap / So c1  DRDOS/sec (FAT-
 2  XENIX root      3c  PartitionMagic  83  Linux           c4  DRDOS/sec (FAT-
 3  XENIX usr       40  Venix 80286     84  OS/2 hidden C:  c6  DRDOS/sec (FAT-
 4  FAT16 <32M      41  PPC PReP Boot   85  Linux extended  c7  Syrinx
 5  Extended        42  SFS             86  NTFS volume set da  Non-FS data
 6  FAT16           4d  QNX4.x          87  NTFS volume set db  CP/M / CTOS / .
 7  HPFS/NTFS       4e  QNX4.x 2nd part 88  Linux plaintext de  Dell Utility
 8  AIX             4f  QNX4.x 3rd part 8e  Linux LVM       df  BootIt
 9  AIX bootable    50  OnTrack DM      93  Amoeba          e1  DOS access
 a  OS/2 Boot Manag 51  OnTrack DM6 Aux 94  Amoeba BBT      e3  DOS R/O
 b  W95 FAT32       52  CP/M            9f  BSD/OS          e4  SpeedStor
 c  W95 FAT32 (LBA) 53  OnTrack DM6 Aux a0  IBM Thinkpad hi eb  BeOS fs
 e  W95 FAT16 (LBA) 54  OnTrackDM6      a5  FreeBSD         ee  GPT
 f  W95 Ext'd (LBA) 55  EZ-Drive        a6  OpenBSD         ef  EFI (FAT-12/16/
10  OPUS            56  Golden Bow      a7  NeXTSTEP        f0  Linux/PA-RISC b
11  Hidden FAT12    5c  Priam Edisk     a8  Darwin UFS      f1  SpeedStor
12  Compaq diagnost 61  SpeedStor       a9  NetBSD          f4  SpeedStor
14  Hidden FAT16 <3 63  GNU HURD or Sys ab  Darwin boot     f2  DOS secondary
16  Hidden FAT16    64  Novell Netware  af  HFS / HFS+      fb  VMware VMFS
17  Hidden HPFS/NTF 65  Novell Netware  b7  BSDI fs         fc  VMware VMKCORE
18  AST SmartSleep  70  DiskSecure Mult b8  BSDI swap       fd  Linux raid auto
1b  Hidden W95 FAT3 75  PC/IX           bb  Boot Wizard hid fe  LANstep
1c  Hidden W95 FAT3 80  Old Minix       be  Solaris boot    ff  BBT
1e  Hidden W95 FAT1

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 22: 无效的参数.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.

[root@CGZ ~]# fdisk -l

Disk /dev/sda: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00065f00

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        1913    15360000   83  Linux
/dev/sda2            1913        2174     2097152   82  Linux swap / Solaris