Linux的磁盘分区

浏览数：22 / 时间：2015年06月20日

磁道：track

扇区：sector

磁头：head

柱面：cylinder

每个扇区，512字节
每个磁道划分为63个扇区
逻辑磁头（盘面）数设为255
　　一个柱面的大小
　　=255 * 63 * 512 = 8M
硬盘或分区的容量
=柱面大小 * 柱面数

[root@localhost ~]# fdisk -l ###fdisk查看磁盘列表 fdisk -l /dev/sdb 单独查看一块磁盘

Disk /dev/sda: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          25      200781   83  Linux
/dev/sda2              26         156     1052257+  82  Linux swap / Solaris
/dev/sda3             157        5221    40684612+  83  Linux

Disk /dev/sdb: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdb doesn‘t contain a valid partition table

划分新的磁盘

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)

常用的划分参数：n 增加新的分区 t 修改存在分区 w 保存退出 q 不保存退出

按照提示进行划分，分区大小直接 +xG

划分结束后：partprobe /dev/sdb 识别新的分区表

[root@localhost ~]# fdisk -l /dev/sdb

Disk /dev/sdb: 42.9 GB, 42949672960 bytes
255 heads, 63 sectors/track, 5221 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1        1217     9775521   83  Linux
/dev/sdb2            1218        2434     9775552+  83  Linux
/dev/sdb3            2435        5221    22386577+   5  Extended
/dev/sdb5            2435        2557      987966   82  Linux swap / Solaris
/dev/sdb6            2558        3166     4891761    b  W95 FAT32