I would like to use this function on USB drive. I can't sucessful defrag .ISO file. Grub4dos require file that unfragment. I tried every softwares out there but none of them successful. Then I deleted all files and re-copy file to my USB drive again.
I think if you defrag all files start at the 1 sector, sort by name, it may finish faster and 0 fragment.
I using PerfectDisk for 10 year but it doesn't support portable.