RPi Resize Flash Partitions
The prepared images of the raspberry are created for SD cards of the size of 2GB. The SD card can be resized to use the full size of a SD card that is greater than 2GB. This page explains how to format the SD card to use the full size of it.
You might want to backup your SD before resizing partitions. Windows-Users may use the HDD Raw Copy Tool
Manually resizing the SD card on Linux
Tutorial video here: http://www.youtube.com/watch?v=R4VovMDnsIE
Following on from the instructions above, keep the newly-written SD card in the card reader, but unmounted. We'll use the
parted (partition editor) tool to resize the partitions.
- Show partition information to find your SD card
$ df -h
Look for a partition that matches the roughly 2GB size of your distribution image.
- Unmount the partition
$ umount /dev/sdc2
- Use parted to examine the card
$ sudo parted /dev/sdd (parted) unit chs (parted) print Disk /dev/sdd: 121535,3,31 Sector size (logical/physical): 512B/512B BIOS cylinder,head,sector geometry: 121536,4,32. Each cylinder is 65.5kB. Partition Table: msdos Number Start End Type File system Flags 1 16,0,0 1215,3,31 primary fat32 lba 2 1232,0,0 26671,3,31 primary ext4 3 26688,0,0 29743,3,31 primary linux-swap(v1)
- This shows how my SD card was formatted after writing the image. Notice that nothing uses the card from end of 'cylinder' 29743 to the card's maximum at 121535.
- Partition 1 is the boot partition: we'll leave that alone. Partition 2 is the root partition, which we'll grow to fill most of the card. Some OS versions will have a Partition 3 for swap space, which needs to be moved to the end of the card. Note that on some other versions of linux (and some other versions of hardware) use /sde not /sdd.
- Move the swap partition if it exists (you'll have to adjust the numbers so that the end of partition 3 is at the end cylinder/head/sector of the card)
- to calculate the number to use in the following command do:-
(Maximum - (Partation 3 End - Partation 3 Start) ) - 1 = Partition 3 New Startso in this example
(121535 - ( 29743 - 26688)) -1 = 118479
- Will not work with parted versions later than 2.4
(parted) move 3 118479,0,0
- Now grow the root partition. This involves removing the partition, re-creating it, then using
resize2fsto grow the filesystem to fill the partition. It won't destroy any data.
(parted) rm 2 (parted) mkpart primary 1232,0,0 118478,3,31 (parted) quit
- Note that the starting address of the new partition is identical to its original value, and the ending address is immediately before the start of the swap partition.
- Now clean and resize the root partition. As before, some users may need to use /sde2 instead.
$ sudo e2fsck -f /dev/sdd2
- (allow it to add lost-and-found)
$ sudo resize2fs /dev/sdd2
- Then put the card in the RPi and boot. You end up with a 7Gb partition to use.
pi@raspberrypi:~$ df -h Filesystem Size Used Avail Use% Mounted on tmpfs 94M 4.0K 94M 1% /lib/init/rw udev 10M 168K 9.9M 2% /dev tmpfs 94M 0 94M 0% /dev/shm rootfs 7.1G 1.3G 5.4G 20% / /dev/mmcblk0p1 75M 28M 48M 37% /boot
Manually extracting partitions from the image on Linux
Get the information about offsets and sizes from the SD-Card-Image:
$ parted -s SD-Card-Image unit KiB print
Here, the -s option directs parted to go into scripting mode and the commands unit KiB print tells parted to display its results in blocks of 1024 byte (KiB, see also block size in GNU Coreutils docu) and print the partition table.
You will get some information like the following (this is created with the Raspbian Wheezy image dated 15-Jul-2012):
Disk SD-Card-Image: 1894400kiB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 4096kiB 61440kiB 57344kiB primary fat16 lba 2 61440kiB 1894400kiB 1832960kiB primary ext4
Now you can extract the partitions with
$ dd if=SD-Card-Image of=Part1 bs=1024 skip=4096 count=57344 $ dd if=SD-Card-Image of=Part2 bs=1024 skip=61440 count=1832960
Fill in the skip and count parameters with the numbers for start and size, which you got from the parted command above.
Manually resizing the SD card using a GUI on Linux
If you are using a PC with a linux distribution to resize the partitions, you can run GParted to resize the partitions using a GUI. This method is tested on Ubuntu 10.10 using the Gnome desktop.
GParted can be installed using:
sudo apt-get install gparted
Note: I had to physically remove and re-insert the SD card from the card reader after writing the image before the partitions were recognised properly and the following could be done.
- Start GParted (on my system it is
[System]->[Administration]->[GParted Partition editor]).
- Select the drive corresponding to your SD card (was
/dev/sdh/on my system). You now see the partitions mentioned above (with some tiny unallocated areas in between and a large one after).
- Select the swap partition by clicking on it. Select the menu option
[Partition]->[Resize/Move]and drag the partition to the right (click/drag in the middle).
- Select the ext4 partition and then the
[Resize/Move]menu option. Drag the right edge of the partition all the way to the right (click/drag the right edge).
- When you are satisfied with the changes, click on the green check mark to execute these changes.
Manually resizing the SD card on Raspberry Pi
You can also resize the partitions of the SD card that your Pi is running on.
First you need to change the partition table with fdisk. You need to remove the existing partition entries and then create a single new partition than takes the whole free space of the disk. This will only change the partition table, not the partitions data on disk. The start of the new partition needs to be aligned with the old partition!
sudo fdisk -cu /dev/mmcblk0
Then delete partitions with d and create a new with n. You can view the existing table with p.
- p to see the current start of the main partition
- d, 3 to delete the swap partition
- d, 2 to delete the main partition
- n p 2 to create a new primary partition, next you need to enter the start of the old main partition and then the size (enter for complete SD card). The main partition on the Debian image from 2012-04-19 starts at 157696, but the start of your partition might be different. Check the p output!
- w write the new partition table
Now you need to reboot:
sudo shutdown -r now
After the reboot you need to resize the filesystem on the partition. The
resize2fs command will resize your filesystem to the new size from the changed partition table.
sudo resize2fs /dev/mmcblk0p2
This will take a few minutes, depending on the size and speed of your SD card.
When it is done, you can check the new size with: