有点厌倦了yum软件安装的繁琐，，想安装Debian，新鲜一下。
没有光盘，只能用U盘做系统盘，不满于老是凭据别人的步调安装，稍微有些问题就办理不了，抉择稍微进修一下grub的利用。
空话少说，上步调：
1、在U盘安装grub2
条件：
电脑设为从USB设备启动。
要有一个Linux系统来安装Grub.
实施步调：
将U盘分为2个区，第一个区为vfat名目，第二个区为ext2名目，grub安装到第二个区，将第二个区作为可引导区
1、分区
[[email protected] ~]# fdisk /dev/sdb
Command (m for help): d
Selected partition 1
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-487, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-487, default 487): +3072M
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 2
First cylinder (375-487, default 375):
Using default value 375
Last cylinder or +size or +sizeM or +sizeK (375-487, default 487):
Using default value 487
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 16: 设备或资源忙.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.
2、名目化分区
卸载U盘：在桌面右键点击“删除文件卷”
插上U盘
[[email protected] ~]# ls /dev/sd*
/dev/sda /dev/sda1 /dev/sda2 /dev/sda3 /dev/sda4 /dev/sda5 /dev/sda6 /dev/sda7 /dev/sda8 /dev/sdb /dev/sdb1 /dev/sdb2
[[email protected] ~]# umount /dev/sdb1
[[email protected] ~]# umount /dev/sdb2
[[email protected] ~]# mkfs.vfat /dev/sdb1
mkfs.vfat 2.11 (12 Mar 2005)
[[email protected] ~]# mkfs.ext2 /dev/sdb2
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
113568 inodes, 226918 blocks
11345 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=234881024
7 block groups
32768 blocks per group, 32768 fragments per group
16224 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840
Writing inode tables: done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 24 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
3、激活/dev/sdb2
[[email protected] ~]# fdisk /dev/sdb
Command (m for help): a
Partition number (1-4): 2
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[[email protected] ~]# fdisk -l
...
Disk /dev/sdb: 4008 MB, 4008706048 bytes
255 heads, 63 sectors/track, 487 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes