atmark@atde5:~$ mount
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,relatime,size=10240k,nr_inodes=61963,mode=755)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,noexec,relatime,size=50816k,mode=755)
/dev/mapper/atde5-root on / type ext4 (rw,relatime,errors=remount-ro,user_xattr,barrier=1,data=ordered)
tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k)
tmpfs on /run/shm type tmpfs (rw,nosuid,nodev,noexec,relatime,size=101620k)
/dev/sda1 on /boot type ext2 (rw,relatime,errors=continue)
rpc_pipefs on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw,relatime)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,nosuid,nodev,noexec,relatime)
atmark@atde5:~$ sudo umount /dev/sda1
[sudo] password for atmark: 
atmark@atde5:~$ ls
loader-armadillo810-mmcsd-v3.7.0.bin  テンプレート  ドキュメント  音楽  公開
ダウンロード                          デスクトップ  ビデオ        画像
atmark@atde5:~$ sudo fdisk /dev/sda

Command (m for help): o
Building a new DOS disklabel with disk identifier 0x192c93f4.
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): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p): 
Using default response p
Partition number (1-4, default 1): 
Using default value 1
First sector (2048-67108863, default 2048): 
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-67108863, default 67108863): +128M

Command (m for help): n
Partition type:
   p   primary (1 primary, 0 extended, 3 free)
   e   extended
Select (default p): 
Using default response p
Partition number (1-4, default 2): 
Using default value 2
First sector (264192-67108863, default 264192): 
Using default value 264192
Last sector, +sectors or +size{K,M,G} (264192-67108863, default 67108863): 
Using default value 67108863

Command (m for help): t
Partition number (1-4): 1
Hex code (type L to list codes): b
Changed system type of partition 1 to b (W95 FAT32)

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: デバイスもしくはリソースがビジー状態です.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)

WARNING: If you have created or modified any DOS 6.x
partitions, please see the fdisk manual page for additional
information.
Syncing disks.
atmark@atde5:~$ sudo fdisk -l /dev/sda

Disk /dev/sda: 34.4 GB, 34359738368 bytes
255 heads, 63 sectors/track, 4177 cylinders, total 67108864 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: 0x192c93f4

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1            2048      264191      131072    b  W95 FAT32
/dev/sda2          264192    67108863    33422336   83  Linux
atmark@atde5:~$ sudo mkfs.vfat -F 32 /dev/sda1
mkfs.vfat 3.0.13 (30 Jun 2012)
atmark@atde5:~$ sudo mkfs.ext3 /dev/sda2
mke2fs 1.42.5 (29-Jul-2012)
mkfs.ext3: inode_size (128) * inodes_count (0) too big for a
	filesystem with 0 blocks, specify higher inode_ratio (-i)
	or lower inode count (-N).

atmark@atde5:~$