diff --git a/usr/lib/hwsupport/format-device.sh b/usr/lib/hwsupport/format-device.sh
index 3a4098d..58d66d3 100755
--- a/usr/lib/hwsupport/format-device.sh
+++ b/usr/lib/hwsupport/format-device.sh
@@ -133,7 +133,37 @@ echo "stage=formatting"
 sync
 parted --script "$STORAGE_DEVICE" mklabel gpt mkpart primary 0% 100%
 sync
-mkfs.ext4 -m 0 -O casefold -E "$EXTENDED_OPTIONS" "${EXTRA_MKFS_ARGS[@]}" -F "$STORAGE_PARTITION"
+#### SteamOS Btrfs Begin ####
+if [[ -f /etc/default/steamos-btrfs ]]; then
+    source /etc/default/steamos-btrfs
+fi
+if [[ "$STEAMOS_BTRFS_SDCARD_FORMAT_FS" == "btrfs" ]]; then
+    mkfs.btrfs "${EXTRA_MKFS_ARGS[@]}" ${STEAMOS_BTRFS_SDCARD_BTRFS_FORMAT_OPTS:--f -K} "$STORAGE_PARTITION"
+    MOUNT_DIR="/var/run/sdcard-mount"
+    mkdir -p "$MOUNT_DIR"
+    mount -o "${STEAMOS_BTRFS_SDCARD_BTRFS_MOUNT_OPTS:-rw,noatime,lazytime,compress-force=zstd,space_cache=v2,autodefrag,ssd_spread,nodiscard}" "$STORAGE_PARTITION" "$MOUNT_DIR"
+    btrfs subvolume create "$MOUNT_DIR/${STEAMOS_BTRFS_SDCARD_BTRFS_MOUNT_SUBVOL:-@}"
+    btrfs subvolume set-default "$MOUNT_DIR/${STEAMOS_BTRFS_SDCARD_BTRFS_MOUNT_SUBVOL:-@}"
+    umount -l "$MOUNT_DIR"
+    rmdir "$MOUNT_DIR"
+elif [[ "$STEAMOS_BTRFS_SDCARD_FORMAT_FS" == "f2fs" ]]; then
+    if [[ "${#EXTRA_MKFS_ARGS[@]}" -gt 0 && "${EXTRA_MKFS_ARGS[0]}" == '-L' ]]; then
+        EXTRA_MKFS_ARGS[0]='-l'
+    fi
+    mkfs.f2fs "${EXTRA_MKFS_ARGS[@]}" ${STEAMOS_BTRFS_SDCARD_F2FS_FORMAT_OPTS:--O encrypt,extra_attr,inode_checksum,sb_checksum,casefold,compression -C utf8 -f -t 0} "$STORAGE_PARTITION"
+elif [[ "$STEAMOS_BTRFS_SDCARD_FORMAT_FS" == "fat" ]]; then
+    if [[ "${#EXTRA_MKFS_ARGS[@]}" -gt 0 && "${EXTRA_MKFS_ARGS[0]}" == '-L' ]]; then
+        EXTRA_MKFS_ARGS[0]='-n'
+    fi
+    mkfs.vfat "${EXTRA_MKFS_ARGS[@]}" "${EXTRA_MKFS_ARGS[@]}" ${STEAMOS_BTRFS_SDCARD_FAT_FORMAT_OPTS:--F 32 -I} "$STORAGE_PARTITION"
+elif [[ "$STEAMOS_BTRFS_SDCARD_FORMAT_FS" == "exfat" ]]; then
+    mkfs.exfat "${EXTRA_MKFS_ARGS[@]}" ${STEAMOS_BTRFS_SDCARD_EXFAT_FORMAT_OPTS:---pack-bitmap} "$STORAGE_PARTITION"
+elif [[ "$STEAMOS_BTRFS_SDCARD_FORMAT_FS" == "ntfs" ]]; then
+    mkfs.ntfs "${EXTRA_MKFS_ARGS[@]}" ${STEAMOS_BTRFS_SDCARD_NTFS_FORMAT_OPTS:--f -F} "$STORAGE_PARTITION"
+else
+    mkfs.ext4 -E "$EXTENDED_OPTIONS" "${EXTRA_MKFS_ARGS[@]}" ${STEAMOS_BTRFS_SDCARD_EXT4_FORMAT_OPTS:--m 0 -O casefold -F} "$STORAGE_PARTITION"
+fi
+#### SteamOS Btrfs End ####
 sync
 udevadm settle