# imageUSB by PassMark® Software - Overview | Top Next

ImageUSB is a free utility which lets you write an image concurrently to multiple USB Flash Drives. Capable of creating exact bit-level copies of USB Flash Drive (UFDs), ImageUSB is an extremely effective tool for the mass duplication of UFDs. Unlike other USB duplication tools, ImageUSB can preserve all unused and slack space during the cloning process, including the Master Boot Record (MBR). ImageUSB can perform flawless mass duplications of all UFD images, including bootable UFDs. imageUSB also supports writing of an ISO file byte by byte directly to an USB drive, useful in conversion of CD/DVD iso to a bootable USB drive. imageUSB is currently only able to handle images (.bin) files that were created by imageUSB and ISO (.iso) files. imageUSB's .bin files have a 512-byte header added to the beginning of the raw image. Warning: Due to the forensic nature of image duplication by ImageUSB, please ensure that you select UFDs with a storage size similar to the image you wish to duplicate. For example, if a 2GB image is copied to an 8GB USB Flash Drive, the drive will only be able to use two out of the eight gigabytes of storage space. In this scenario, users will need to reformat/repartition the UFD in order to access the rest of the storage space.