aimage can create files in raw, AFF, AFD, or AFM formats. AFF and AFD formats can be compressed or uncompressed. aimage can optionally compress and calculate MD5 or SHA-1 hash residues while the data is being copied. It had intelligent error recovery, similar to what is in ddrescue.
'aimage was withdrawn from support (December 25, 2010)
Linux distributions that packaged image are encouraged to drop it and package guymager instead.