EMUTIL is a disk image archiver for Commodore 64, 128, VIC-20, Plus/4 and CBM/PET computers with 16k or more. It supports all known Commodore disk drives, of all capacities. It also supports all CMD HD and RL Native partitions. EMUTIL creates and dissolves single and multiple archive images. The images may be RLE compressed or uncompressed. A single uncompressed archive image of a 1541 disk is equivalent to a .D64 file, so it will handle those just fine, though it is intended to cover disk drives unsupported by other programs, such as the CBM 8050/8250 and CMD Native drives. Version 4 supports two unpack validation modes: Active, and Only. 'Active' will unpack a sector ONLY if it is different than the sector already on the disk, which may be useful for NAND flash-based drives. 'Only' will validate each sector against the unpack image without writing any sectors, and report how many sectors validated. The program is a collaborative effort by Bo Zimmerman and Andre Fachat.