-f, --find [file] Find the first unused loop device. If a file argument is present, use the found device as loop device. Otherwise, just print its name.-P, --partscan Force the kernel to scan the partition table on a newly created loop device. Note that the partition table parsing depends on sector sizes. The default is sector size is 512 bytes, otherwise you need to use the option --sector-size together with --partscan.
