This article is similar to this article, except it use parted to partitioning.
When write image to CD card for installation of Raspberry Pi, the usable size will only be the size of the image. That means the rest of the space will be waste. On some distribution such as Fedora Remix or Raspbian Wheezy, when final configuration begin the distro run some script to automatically resize and fill the SD card. However not all distro does that. Therefore we need to do manual resize.
In this article we will discuss about how to manually resize SD card on Slackware. Alhtough using Slackware, you can also use other Linux, but we won’t cover that. This article describes activities relating partitions. Incorrectly following instruction is likely to corrupt your system, so please be careful.
On this article I use:
Yes, we will resize Raspbian manually even though we know Raspbian can resize SD card automatically on raspi-config.
Insert the SD card to our machine. Make sure it is now mounted. We will use partition tool to resize the partition.
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 our SD card. Look for a partition that matches the roughly the size of your distribution image. On Debian Wheezy it should be around 2GB. For example, it is detected as /dev/sdc2. Then unmount that partition. Those can be done by invoking:
mount umount /dev/sdc2
Now use parted utility (GNU Parted) with root privileges. You can do sudo if you are on sudoer group or use super user account.
parted /dev/sdc (parted) unit chs (parted) print Disk /dev/sdc: 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. Nothing to do here, let’s 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 partitioning swap before primary filesystem. Well, if that’s the case, our task will be easier.
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 formula can be used:
Partition 3 New Start = (Maximum - (Partition 3 End - Partition 3 Start) ) - 1
so in this example
(121535 - ( 29743 - 26688)) -1 = 118479
Note: Following command will not work if your parted versions later than 2.4. On my machine, parted is at version 3.1
(parted) move 3 118479,0,0
Now grow the root partition. This involves removing the partition, re-creating it, then using
resize2fs to 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.
e2fsck -f /dev/sdc2
That command will allow it to add lost-and-found.
Then put the card in the RPi and boot. You end up with a 7Gb partition to use.
[email protected]:~$ 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
And that’s it, we can enjoy Raspberry again 😀embedded, partition, rpi, slackware