# Pastebin ZzxqKM9o
max@uscentral:/mnt/bigdisk/ubuntu$ mkfs.ext4 -F -E offset=$((2048 * 512)) my-image.img
mke2fs 1.42.13 (17-May-2015)
Found a dos partition table in my-image.img
Discarding device blocks: done                            
Creating filesystem with 244140 4k blocks and 61056 inodes
Filesystem UUID: 6d8d6e46-b3c2-4370-90c6-6a75c3e10d84
Superblock backups stored on blocks: 
        32768, 98304, 163840, 229376

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done

max@uscentral:/mnt/bigdisk/ubuntu$ mkdir mnt
max@uscentral:/mnt/bigdisk/ubuntu$ mount-img my-image.img mnt
mount: wrong fs type, bad option, bad superblock on /dev/loop0,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.