TF/sd卡分区成fat32和ext3分区

root@vincent:/# fdisk -l

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x000d63d3


   Device Boot      Start         End      Blocks   Id  System
/dev/sda1            2048    19531775     9764864   82  Linux swap / Solaris
/dev/sda2   *    19531776   214843391    97655808   83  Linux
/dev/sda3       214843392  1953523711   869340160   83  Linux


Disk /dev/sdb: 1007 MB, 1007681536 bytes
9 heads, 8 sectors/track, 27335 cylinders, total 1968128 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000


   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1             253     1968127      983937+   b  W95 FAT32

//注意，如果sd卡分区已经mount到系统了，应该先umount：umount   /media/***，不然后续操作会出现问题

root@vincent:/# fdisk /dev/sdb               //注意此处不是sdb1，而是sdb，sdb1是sdb的第一个分区，当前这个sdb卡只有一个分区


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): o
Building a new DOS disklabel with disk identifier 0xc0238ad2.
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)
Command (m for help): p


Disk /dev/sdb: 1007 MB, 1007681536 bytes
9 heads, 8 sectors/track, 27335 cylinders, total 1968128 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xc0238ad2


   Device Boot      Start         End      Blocks   Id  System


Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4, default 1): 1
First sector (2048-1968127, default 2048):    //此处直接回车即可
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-1968127, default 1968127): +256M


Command (m for help): p


Disk /dev/sdb: 1007 MB, 1007681536 bytes
9 heads, 8 sectors/track, 27335 cylinders, total 1968128 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xc0238ad2


   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048      526335      262144   83  Linux


Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4, default 2):        //此处直接回车即可
Using default value 2
First sector (526336-1968127, default 526336):        //此处直接回车即可
Using default value 526336
Last sector, +sectors or +size{K,M,G} (526336-1968127, default 1968127):      //此处直接回车即可
Using default value 1968127


Command (m for help): w                       //必须输入“w”上面的分区才会保存下来        
The partition table has been altered!


Calling ioctl() to re-read partition table.
Syncing disks.
root@vincent:/# fdisk -l


Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x000d63d3


   Device Boot      Start         End      Blocks   Id  System
/dev/sda1            2048    19531775     9764864   82  Linux swap / Solaris
/dev/sda2   *    19531776   214843391    97655808   83  Linux
/dev/sda3       214843392  1953523711   869340160   83  Linux


Disk /dev/sdb: 1007 MB, 1007681536 bytes
31 heads, 62 sectors/track, 1024 cylinders, total 1968128 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xf3878a60


   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1            2048      526335      262144   83  Linux
/dev/sdb2          526336     1968127      720896   83  Linux
root@vincent:/file# mkfs.vfat  -F  32  -n  boot   /dev/sdb1           //fat32分区，boot是分区的名字
mkfs.vfat 3.0.9 (31 Jan 2010)
root@vincent:/file# mkfs.ext3  -L  system   /dev/sdb2               //ext3分区，system是分区的名字
mke2fs 1.41.14 (22-Dec-2010)
Filesystem label=system
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
45120 inodes, 180224 blocks
9011 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=184549376
6 block groups
32768 blocks per group, 32768 fragments per group
7520 inodes per group
Superblock backups stored on blocks: 
32768, 98304, 163840


Writing inode tables: done                            
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done


This filesystem will be automatically checked every 22 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

拔掉SD卡，重新插上，就可以检测到一个boot和system两个分区