Reformat an SD card

reformat_sd_card.sh

#!/bin/sh
TARGETDISK="/dev/mmcblk0"
TARGETPARTITION="p1"
MOUNTPOINT="/media/mmcblk0p1"

# Unmount the current SD card
echo "Unmounting SD card..."
umount $MOUNTPOINT
echo ""

# Delete the current partition on the disk (there is only 1)
echo "Deleting existing partition..."
echo "d
w" | fdisk $TARGETDISK
echo ""

# Re-create FAT32 partition
echo "Re-creating FAT32 partition..."
echo "n
p
1



t
b
w" | fdisk $TARGETDISK
echo ""
echo "Waiting 5 seconds for partition to prepare..."
sleep 5
echo ""
echo "Unmounting new partition and creating the DOS file system..."
umount $MOUNTPOINT
mkdosfs -v $TARGETDISK$TARGETPARTITION
echo ""

echo "Re-mounting the new, fresh file system..."
sleep 2
mount $TARGETDISK$TARGETPARTITION $MOUNTPOINT
echo "Complete!"