The WIM is read-only (file permissions, header flag, or split WIM).Ĭp install.wim /Volumes/MYUSB/sources/install.wim You may need sudo, because you could encounter an error like this: Can't modify '/home/roger/win/sources/install.wim': Permission denied 'install.wim' optimized size: 3311533 KiB Wimlib-imagex optimize install.wim -solid 'install.wim' original size: 4463411 KiBĪrchiving file data: 9 GiB of 9 GiB (100%) done I managed to reduce the size bellow 4Go, my FAT32 usb thumb accepted it, and booted with successĬopie the bigfile from the iso volume to your HD Disk (Download example by example)Ĭp /Volumes/CCC./sources/install.wim install.wim The open-source package called wimlib, can also 'optimize' a wim file.