Partition Imager without Empty Blocks

view story

http://forums.fedoraforum.org – So I just did a dd image of a partition and gzip'd it on the fly. After formatting the partition, I realized I forgot to get some files off the drive *doh*. So I had to gunzip the image (109GB image gzip'd to 25GB) before I could mount it as a loop device. My question is, does anyone know of a live tool (not ghost or any live CD) that can do an image of a drive but skip the empty blocks? I used partimage but they must use a special format for their images, because I can't mount it as a loop device, I just get wrong fs type error using "mount -o loop partimage /mnt/point" (HowTos)