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...uestions/783548/hyper-v-how-to-connect-compressed-ntfs-storage-or-convert-it If you just want to do it with libguestfs and don't need to automate the process (ie. you're only doing it one-off for a few disks), then it's better to use virt-rescue. Something like this: $ virt-rescue -a thedisk ><rescue> mount /dev/sda2 /sysroot ><rescue> cd /sysroot ><rescue> setfattr -h -v 0x00000000 -n system.ntfs_attrib directory-name (See also: http://www.tuxera.com/community/ntfs-3g-advanced/data-compression/) You can also use the regular getfattr command to list the att...