Formatting an SD card/Linux

This is an add-on section for formatting an SD card to FAT32.

This page is for Linux users only. If you are not on Linux, check out the Windows or Mac pages.

Instructions

Before beginning these steps, copy all of your SD card's contents to a folder on your computer.

The commands in this guide are case-sensitive. Enter them exactly as written, or there may be unintended consequences.

1. Make sure your SD card is not inserted
2. Open a terminal window and type watch lsblk.
3. Insert the SD card and watch for a new device appearing in lsblk.
4. Observe the output for the new device. It should match something like this:

   NAME        MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
   mmcblk0     179:0    0   3,8G  0 disk
   └─mmcblk0p1 179:1    0   3,7G  0 part /run/media/user/FFFF-FFFF
   

5. Take note of the name of the device that now appears. In our example above, it was mmcblk0p1
   • If RO is set to 1, make sure the lock switch is not slid down
6. Hit CTRL + C to exit the menu
7. Type sudo fdisk /dev/<device name>
8. Enter t and then enter 0c
9. Enter a and then p - observe the output, and make sure the device is now formatted correctly.
10. If there are no issues, enter w - this will save changes and exit the fdisk prompt.
11. Type sudo mkfs.vfat /dev/<device name>1 -s 64 to reformat the new partition.
    • If the SD card is over 32GB in size, change 64 to 128
12. Type sudo eject /dev/<device name>, then remove and reinsert the SD card.
13. Copy your data back onto the SD card.