Create a Dual Partition SD Card with Linux / Ubuntu

$ sudo fdisk /dev/sdc Print the partition record, so you know your starting point. Command (m for help):  [p] Disk /dev/sdc: 2021 MB, 2021654528 bytes 255 heads, 63 sectors/track, 245 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot      Start         End      Blocks   Id  System /dev/sdc1   *           1         246     1974240+   c  W95 FAT32 (LBA) Partition 1 has different physical/logical endings: phys=(244, 254, 63) logical=(245, 200, 19) Delete the existing partition. Command (m for help):  [d] Selected partition 1 Create the FAT32 partition for booting and transferring files from Windows. Mark it as bootable. Command (m for help):  [n] Command action e   extended p   primary partition (1-4) [p] Partition number (1-4):  [1] First cylinder (1-245, default 1): [(press Enter)] Using default value 1 Last cylinder or +size or +sizeM or +sizeK (1-245, default 245): [+50] Command (m for help):  [t] Selected partition  1 Hex code (type L to list codes):  [c] Changed system type of partition 1 to c (W95 FAT32 (LBA)) Command (m for help):  [a] Partition number (1-4):  [1] Create the Linux partition for the root file system. Command (m for help):  [n] Command action e   extended p   primary partition (1-4) [p] Partition number (1-4):  [2] First cylinder (52-245, default 52):  [(press Enter)] Using default value 52 Last cylinder or +size or +sizeM or +sizeK (52-245, default 245): [(press Enter)] Using default value 245 Print and save the new partition records. Command (m for help):  [p] Disk /dev/sdc: 2021 MB, 2021654528 bytes 255 heads, 63 sectors/track, 245 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot      Start         End      Blocks   Id  System /dev/sdc1   *           1          51      409626    c  W95 FAT32 (LBA) /dev/sdc2              52         245     1558305   83  Linux Command (m for help):  [w] The partition table has been altered! Calling ioctl() to re-read partition table. WARNING: Re-reading the partition table failed with error 16: Device or resource busy. The kernel still uses the old table. The new table will be used at the next reboot. WARNING: If you have created or modified any DOS 6.x partitions, please see the fdisk manual page for additional information. Syncing disks. Format the partitions. $ sudo mkfs.msdos -F 32 /dev/sdc1 -n LABEL mkfs.msdos 2.11 (12 Mar 2005) $ sudo mkfs.ext3 /dev/sdc2 mke2fs 1.40-WIP (14-Nov-2006) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) 195072 inodes, 389576 blocks 19478 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=402653184 12 block groups 32768 blocks per group, 32768 fragments per group 16256 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912 Writing inode tables: done Creating journal (8192 blocks): done Writing superblocks and filesystem accounting information:

Risk level: destructive. Review the command before running it.