fdisk -l /dev/sdg

Disk /dev/sdg: 16.2 GB, 16170196480 bytes
255 heads, 63 sectors/track, 1965 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x9f67ef29

   Device Boot      Start         End      Blocks   Id  System
/dev/sdg1   *           1           5       40131    c  W95 FAT32 (LBA)


fdisk -l ~/rompaq.img

You must set cylinders.
You can do this from the extra functions menu.

Disk ~/rompaq.img: 0 MB, 0 bytes
255 heads, 63 sectors/track, 0 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x9f67ef29

                       Device Boot      Start         End      Blocks   Id  System
~/rompaq.img1   *           1           5       40131    c  W95 FAT32 (LBA)