I found an old stash of floppies and a USB floppy drive. I've decided to use for backing up essential file(s).

Tried btrfs.

Nope, it's not possible:

```

wipefs -a /dev/sdd

/dev/sdd: 8 bytes were erased at offset 0x00000036 (vfat): 46 41 54 31 32 20 20 20 /dev/sdd: 1 byte was erased at offset 0x00000000 (vfat): eb /dev/sdd: 2 bytes were erased at offset 0x000001fe (vfat): 55 aa

mkfs.btrfs /dev/sdd

btrfs-progs v6.3.2 See https://btrfs.readthedocs.io for more information.

ERROR: probe of /dev/sdd failed, cannot detect existing filesystem ERROR: '/dev/sdd' is too small to make a usable filesystem ERROR: minimum size for each btrfs device is 114294784 ```

You need 78 floppy drives for a minimal btrfs.

But I was able to make XFS with enabled check-summing.

df -h /mnt/ Filesystem Size Used Avail Use% Mounted on /dev/sdd 1.4M 57K 1.4M 5% /mnt