OSFClone is a freeware tool which allows you to create or clone exact raw images of your hard disk drives quickly. The tool is a self-booting solution creates the clones independent of the installed operating system. OSFClone also supports imaging drives to the open Advance Forensics Format (AFF) which is an open and extensible format to store disk images and associated metadata.
OSFClone creates a forensic image of a disk, preserving any unused sectors, slack space, file fragmentation and undeleted file records from the original hard disk. Boot into OSFClone and create disk clones of FAT, NTFS and USB-connected drives. OSFClone can be booted from CD/DVD drives, or from USB flash drives.
It also creates clones in dc3dd format, which is ideal for computer forensics due to its increased level of reporting for progress and errors, and ability to hash files on-the-fly.
OSFClone is available for download in .iso format and also Zip format suited for USB flash drives.