/ # fdisk -l

Disk /dev/mmcblk0: 15.8 GB, 15896412160 bytes
4 heads, 16 sectors/track, 485120 cylinders
Units = cylinders of 64 * 512 = 32768 bytes

Device Boot Start End Blocks Id System
/dev/mmcblk0p1 17 288512 9231872 c Win95 FAT32 (LBA)
/dev/mmcblk0p2 288513 419584 4194304 83 Linux
/dev/mmcblk0p3 419585 485120 2097152 83 Linux

mkfs.ext4 /dev/mmcblk0p1
mke2fs 1.41.9 (22-Aug-2009)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
577088 inodes, 2307968 blocks
115398 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2365587456
71 block groups
32768 blocks per group, 32768 fragments per group
8128 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632

Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 36 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.

~ $ mount
rootfs on / type rootfs (rw)
/dev/root on / type ext4 (rw,noatime,errors=remount-ro,barrier=1,stripe=8,data=ordered)
devtmpfs on /dev type devtmpfs (rw,relatime,size=504248k,nr_inodes=126062,mode=75 5)
none on /proc type proc (rw,nosuid,nodev,noexec,relatime)
none on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /tmp type tmpfs (rw,noatime,size=4096k)
tmpfs on /var/run type tmpfs (rw,nosuid,noatime,size=512k)
none on /dev type tmpfs (rw,noatime,size=10240k,mode=755)
securityfs on /sys/kernel/security type securityfs (rw,relatime)
devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev,noatime,size=65536k)
/dev/mmcblk0p3 on /home type ext4 (rw,noatime,errors=remount-ro,barrier=1,data=ordered)
tmpfs on /home/user/MyDocs type tmpfs (ro,relatime,size=512k)
none on /sys/kernel/debug type debugfs (rw,relatime)
aegisfs on /var/run/applauncherd type fuse.aegisfs (rw,nosuid,nodev,relatime,user_id=30004,group_id=3 0010,allow_other)
aegisfs on /home/user/.odnp-fpcd/private type fuse.aegisfs (rw,nosuid,nodev,relatime,user_id=30004,group_id=3 0010,allow_other)
aegisfs on /home/user/.mms/private type fuse.aegisfs (rw,nosuid,nodev,relatime,user_id=30004,group_id=3 0010,allow_other)
aegisfs on /home/user/.odnp/private type fuse.aegisfs (rw,nosuid,nodev,relatime,user_id=30004,group_id=3 0010,allow_other)
aegisfs on /home/user/.positioningd/private type fuse.aegisfs (rw,nosuid,nodev,relatime,user_id=30004,group_id=3 0010,allow_other)
aegisfs on /var/cache/timed/aegis type fuse.aegisfs (rw,nosuid,nodev,relatime,user_id=30004,group_id=3 0010,allow_other)
aegisfs on /home/user/.slpgwd/layer type fuse.aegisfs (rw,nosuid,nodev,relatime,user_id=30004,group_id=3 0010,allow_other)
aegisfs on /home/user/.signon/private type fuse.aegisfs (rw,nosuid,nodev,relatime,user_id=30004,group_id=3 0010,allow_other)
aegisfs on /home/user/private type fuse.aegisfs (rw,nosuid,nodev,relatime,user_id=30004,group_id=3 0010,allow_other)
aegisfs on /etc/ssl/certs type fuse.aegisfs (rw,nosuid,nodev,relatime,user_id=30004,group_id=3 0010,allow_other)
cgroup on /syspart type cgroup (rw,relatime,freezer,memory,cpu)
/dev/mapper/signonfs on /home/user/.signon/signonfs-mnt type ext2 (rw,sync,noexec,relatime,errors=continue)
aegisfs on /home/user/.facebook/private type fuse.aegisfs (rw,nosuid,nodev,relatime,user_id=30004,group_id=3 0010,allow_other)

~ $ pwd
/home/user
~ $ echo "why works?" > test.txt
~ $ ls
MyDocs private test.txt
~ $ cat test.txt
why works?