You must set cylinders.
You can do this from the extra functions menu.
Disk /var/backup/kulthea.img: 0 MB, 0 bytes
255 heads, 63 sectors/track, 0 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/var/backup/kulthea.img1 * 1 486 3903763+ 83 Linux
/var/backup/kulthea.img2 487 729 1951897+ 83 Linux
/var/backup/kulthea.img3 730 851 979965 83 Linux
/var/backup/kulthea.img4 852 2055 9671130 5 Extended
Partition 4 has different physical/logical endings:
phys=(1023, 254, 63) logical=(2054, 254, 63)
/var/backup/kulthea.img5 1994 2055 498015 82 Linux swap / Solaris
/var/backup/kulthea.img6 852 1992 9165019+ 83 Linux
Partition table entries are not in disk order