Hey, thanks for your patience.
I'm going to pull this.that module can definitely use some cleanup.
curtin has lots of stuff that does this sort of thing better.
For something like "find out how big a block device is" in sectors we could do
$ sudo blockdev --getsize /dev/sdb
$ cat /sys/class/block/sdb/size
For that value in bytes:
$ sudo blockdev --getsize64 /dev/sdb
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