注意：
fat16和fat32直接在windows下右键就可以了。
ext2需要在linux进行格式化，步骤如下
1.首先sudo sfdisk -c /dev/sdb 1 83将整个分区ID改成83
2.然后
sudo fdisk -l查看分区情况
sudo fdisk /dev/sdb1
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)
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1017, default 1): 回车
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-1017, default 1017): 回车
Using default value 1017
Command (m for help): p
Disk /dev/sdc1: 4007 MB, 4007076864 bytes
124 heads, 62 sectors/track, 1017 cylinders
Units = cylinders of 7688 * 512 = 3936256 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x6e9dbf3d
Device Boot Start End Blocks Id System
/dev/sdc1p1 1 1017 3909317 83 Linux
Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 83
Command (m for help): w
2.此时分区便建立好了，但是必须格式化才能用。
mkfs.ext2 /dev/sdb1
mkfs.ext2 之后 ，整个sdb1都会变成83的ID，
此时sudo fdisk -l显示如下
Device Boot Start End Blocks Id System
/dev/sdb1 1 1018 3913161 83 LINUX