ubuntu下格式化sd卡

在linux下环境下将sd卡插入读卡器，就自动挂载了，所以要先卸载。

$sudo -i

取得root权限

# mount

可以看到最后一行的设备号

/dev/mmcblk0 on /media/FCC8-85C1 type vfat (rw,nosuid,nodev,uhelper=udisks,uid=1000,gid=1000,shortname=mixed,dmask=0077,utf8=1,showexec,flush)

umount这个sd卡

# umount /dev/mmcblk0

然后使用fdisk工具

# fdisk /dev/mmcblk0

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): 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)

先P，可以看到sd卡的现在分为4个区。

然后d，删除原分区，之后再n，创建新分区。

Command (m for help): d

Partition number (1-4): 1

Command (m for help): d

Partition number (1-4): 2

Warning: partition 2 has empty type

Command (m for help): d

Partition number (1-4): 3

Command (m for help): d

Selected partition 4

删除分区之后再查看一下

Command (m for help): p

Disk /dev/mmcblk0: 2057 MB, 2057306112 bytes

4 heads, 16 sectors/track, 62784 cylinders

Units = cylinders of 64 * 512 = 32768 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x6f20736b

        Device Boot      Start         End      Blocks   Id  System

新建分区

Command (m for help): n

Command action

   e   extended

   p   primary partition (1-4)

p

Partition number (1-4): 1

First cylinder (1-62784, default 1): 

（回车）

Using default value 1

Last cylinder, +cylinders or +size{K,M,G} (1-62784, default 62784):

（回车） 

Using default value 62784

因为我只建立一个分区，所以在First cylinder (1-62784, default 1): 和Last cylinder, +cylinders or +size{K,M,G} (1-62784, default 62784):都不填写，直接回车

然后查看分区类型代码

Command (m for help): t

Selected partition 1

Hex code (type L to list codes): 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

Hex code (type L to list codes): 6

Changed system type of partition 1 to 6 (FAT16)

fat16为6,是我要的格式，所以Hex code (type L to list codes): 后面填6,回车

最后保存分区表

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: If you have created or modified any DOS 6.x

partitions, please see the fdisk manual page for additional

information.

Syncing disks.

然后格式化分区

mkdosfs  /dev/mmcblk0p1

完成~取出sd卡，再装进去，系统能够识别出来分区“2.1 GB SD 卡 驱动器: 2.1 GB 文件系统”，希望可以用了。。。

最后确定还是卡坏了~唉，这电信啊，送个kinston的卡，结果芯片厂商数据都读不出来，有点离谱了……

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