Petabytes? Exabytes? Why not

Frankly I’m a bit surprised this works …

$ guestfish 

Welcome to guestfish, the libguestfs filesystem interactive shell for
editing virtual machine filesystems.

Type: 'help' for help with commands
      'quit' to quit the shell

><fs> sparse /mnt/tmp/test/test.img 1P
><fs> run
><fs> blockdev-getsize64 /dev/vda 
1125899906842624

$ guestfish 

Welcome to guestfish, the libguestfs filesystem interactive shell for
editing virtual machine filesystems.

Type: 'help' for help with commands
      'quit' to quit the shell

><fs> sparse /mnt/tmp/test/test.img 1E
><fs> run
><fs> blockdev-getsize64 /dev/vda 
1152921504606846976