我的手機sd卡需要分成兩個分區，在windowxp下面死活搞不成。
主要的問題是，window只認識sd卡的第一個分區。
有人用修改驅動程序，讓windows把sd卡認成日立的microdisk，分區和格式化也可以完成。但是在我的筆記本上，sd讀卡器是筆記本自帶的，不是接在usb接口上的，這個方法也行不通。

在linux下面給sd卡分區，格式化是非常輕松的。
我安裝的系統是ubuntu10.04。
sd卡插上之后，自動mount了。
所以，第一步，umount。
$sudo -i
輸入自己的密碼取得root權限。
# mount
可以看到最后一行的設備號
/dev/mmcblk0 on /media/60C5-3EC0 type vfat (rw,nosuid,nodev,uhelper=udisks,uid=1000,gid=1000,shortname=mixed,dmask=0077,utf8=1,flush)
umount這個sd卡
# umount /dev/mmcblk0
下面上場的是fdisk工具。
# fdisk /dev/mmcblk0
fdisk命令都是非常簡單的。
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，看看sd卡的分區現狀。
然后d，刪除原分區
n，創建分區

Command (m for help): n
Command action
e?? extended
p?? primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-62528, default 1): 1
Last cylinder, +cylinders or +size{K,M,G} (1-62528, default 62528):? +1500M

t，指定分區類型，
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)

這樣就分好了第一個分區，并且指定了分區為fat16。
第二個，我試做分區為linux分區

Command (m for help): n
Command action
e?? extended
p?? primary partition (1-4)
p
Partition number (1-4): 2
First cylinder (48002-62528, default 48002):
Using default value 48002
Last cylinder, +cylinders or +size{K,M,G} (48002-62528, default 62528):
Using default value 62528

Command (m for help): t
Partition number (1-4): 2
Hex code (type L to list codes): 83

好了，看看成果。

Command (m for help): p

Disk /dev/mmcblk0: 2048 MB, 2048917504 bytes
4 heads, 16 sectors/track, 62528 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
/dev/mmcblk0p1?????????????? 1?????? 48001???? 1536024??? 6? FAT16
/dev/mmcblk0p2?????????? 48002?????? 62528????? 464864?? 83? Linux

好了，把分區信息寫入磁盤。

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.

下面開始格式化。
首先是fat16分區
#mkdosfs? /dev/mmcblk0p1
然后是linux分區
#mkfs.ext3 /dev/mmcblk0p2

完成之后，取出sd卡，再安裝上去，linux系統已經自動識別了兩個分區，可以用了。
放到手機里面去吧。

總結

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