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Since partimage copies only used block of the partition, it must know the layout of the filesystem, and cannot save unsupported filesystems. Here is the list of the filesystems currently supported:

Name Description State
ext2/ext3 the linux standard stable
ext4 improved version of ext3 unsupported
reiserfs-3 a journalized and powerful file system stable
FAT16/32 DOS and Windows file systems stable
HPFS IBM OS/2 File System stable
JFS Journalised File System, from IBM, used on Aix stable
XFS another jounalized and efficient File System, from sgi, used on Irix stable
UFS Unix File System beta
HFS MacOS File System beta
NTFS Windows NT, 2000 and XP experimental

The NTFS (Windows NT File System) is currently not fully supported: this means you will be able to save an NTFS partition if system files are not very fragmented, and if system files are not compressed. In this case, you will be able to save the partition into an image file, and you will be able to restore it after. If there is a problem when saving, an error message will be shown and you won't be able to continue. If you have successfully saved an NTFS NTFS partition, you shouldn't have problems as you restore it (except in the case of bugs). Then the best way is to try to save a partition to know if it is possible. If not, try to defragment it with diskeeper or another tool, and try to saving the partition again.