On Linux Machine backup current data on Micro SD-Card before using fdisk. If SD-Card is located in /dev/sde use the following fdisk command:
Determine Device Name of SD Card
Replace /dev/sde by appropriate device name. df will help you to identify the device name and size of SD card. Use df to display all mounted storage devices:
Depending on your demands or suggestions in manual, create the number of partitions you need
Partition Ratio SD Card
The following in the ratio 3 to 1 (e.g. 4000000 blocks):
- FAT32 (3/4 of total size of SD - e.g. blocks 1-3000000)
- EXT3 (1/4 of total size of SD - e.g. blocks 3000001-4000000)
- Calculate Blocks for Swap with 256MB for 2GB Mirco-SD Card with 12000 Blocks
256/2048 * 12000 = 1500 Blocks needed for Swap with size 256MB
Create Partions on SD Card
Use fdisk to create partitions:
sudo fdisk /dev/sde
- -> p Check partitions
- -> d -> 1 Delete Partition 1 (repeat for other existing partitions)
- -> n -> 1 -> New partition 1 (enter first and last sector)
- -> t -> 1 -> c Set c for FAT32 (LBA)
- -> a -> 1 Set boot flag for first partition
- -> n -> 2 -> New partition 2 (enter first and last sector)
- -> t -> 2 -> 83 Set type 83 for Linux partition
- -> w Write changes
- -> q quit fdisk
Format Micro SD card partitions
After fdisk operations, format both partitions. If SD-Card is located in /dev/sde use the following commands (replace /dev/sde by appropriate device name):
# mkfs.vfat -v -n and-media -F 32 /dev/sde1 # mkfs.ext3 -v -L and-data /dev/sde2
If you are not root you add sudo in front of the command.
- -n sets the name of the partition for FAT32
- -L sets the Label of the partition for ext3
Disk names are useful to distinguish between the partitions from your linux desktop computer especially for storing installation images, files and folders on the correct partition (e.g. two Android partitions for media and data).
If you need a swap partition use partition type 82 for Linux Linux partition in fdisk.
-> t -> 2 -> 82 Set type 82 for Linux partition in fdisk
where 2 is the number of the swap partition (replace 2 with the appropriate partition number).