After installing raspberry pi on my microSD card, i found that my micro SD is not fast enough. if you want to do the test you can go here.

I had to replace my micro SD with another micro SD with bigger capaticy and faster write/read speed. however when i try to re format my micro SD (use it in my android phone). it is displayed that my micro SD size is only 56 Mb, while its capacity is actually 16GB. Where the rest of capacity?

in windows there is disk management tools to manage our partition
(windows logo -> type disk management
or Control Panel\System and Security\Administrative Tools select computer management menu storage click disk management.)

there, my Micro SD (displayed as disk 1) is separated into 2 partition :

56 Mb of FAT partition
14 Gb of unallocated partition

I found out that there is no option to recover unallocated partition via this disk management tool (or is it?).

so i google and got this one http://geekswithblogs.net/ilich/archive/2013/04/26/recovering-unallocated-space-of-a-usb-flash-drive.aspx

We can use diskpart command via windows cmd.

1.run cmd –> type diskpart –> enter, new diskpart window will appear.
2. on diskpart run this command, be carefull, replace “disk 1” with disk name that match your micro SD card.

DISKPART> select disk 1

Disk 1 is now the selected disk.

DISKPART> clean

DiskPart succeeded in cleaning the disk.

DISKPART> create partition primary

DiskPart succeeded in creating the specified partition.

DISKPART> exit

3. after exit, if you open file explorer now micro SD size will display its actual size, right click and format with file format you want to use. mine is FAT32.