Resize root Partition on Raspbian to use free space

Raspbian comes pre-configured to run on smaller SD cards. Thus, the default partition sizes are generally configured to not exceed 4GB. In case you want to use SD cards larger than 4GB (e.g. 32GB) you will definitely want to use the free unallocated space, right? Luckily, this can be achieved rather easily. The default Raspbian partition schema looks something like the following using a 32GB sd card:

pi@raspberrypi / $ sudo fdisk -c -l /dev/mmcblk0

Disk /dev/mmcblk0: 31.3 GB, 31322013696 bytes
4 heads, 16 sectors/track, 955872 cylinders, total 61175808 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: 0x00090806

Device Boot      Start         End      Blocks   Id  System
/dev/mmcblk0p1            8192      122879       57344    c  W95 FAT32 (LBA)
/dev/mmcblk0p2          122880     6399999     3138560   83  Linux

Although you could manually resize your partitions using fdisk Raspbian comes with a handy tool called raspi-config that will take care of this process for you:

raspi-config

All you need to do in order to resize your root partition is to select Expand Filesystem in the menu (see screenshot). raspi-config takes care of the rest for you, pretty neat, right? After a reboot all of your free disk space will be used:

pi@raspberrypi ~ $ df -h
Filesystem      Size  Used Avail Use% Mounted on
rootfs           29G  2.3G   26G   9% /
/dev/root        29G  2.3G   26G   9% /
devtmpfs        215M     0  215M   0% /dev
tmpfs            44M  208K   44M   1% /run
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs            88M     0   88M   0% /run/shm
/dev/mmcblk0p1   56M  9.7M   47M  18% /boot

In case you are still interested in manually resizing your partitions you might want to have a look at e.g. Chris Newland’s post. Enjoy!

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