Well, I have installed QEMU and installed Windows NT on it. I have got the NT installation on a disk file (.img) and I would like to mount it so it appears as a real partition.

I have tried...

I get errors about it notbeing supported. It has a wrong block to be vfat (when I try -t vfat) and it isnt -t msdos. I know it is a FAT filesystem becuase I checked.

Thanks in advance

Try -t auto which will try to auto-detect the filesystem.

-t vfat supports FAT12, FAT16 and FAT32, so if it has the wrong block type then it looks like the contents of your .img file are not a FAT filesystem; possibly it has additional meta-data. How did you create the file? What does this command report the file as:?You might also try -t ntfs if it's an NTFS filesystem; note that this only gives you read support and the ability to append to files IIRC.

The command

returns...

I suppose thats becuase its bootable...

The -t auto tells me I must specify a filesystem...

The MBR isn't on the partition; which suggests that you've taken an image of the entire hard disk (/dev/hda), not just the FAT partition (/dev/hda1).

You will need to pass the -o bytes option to losetup to skip over the MBR header.

Alternatively, you can make a copy of the image file, cutting out the MBR, to get at the actual partition data:

Replacing n with the size of your MBR in kilobytes (bs bytes).

You should then be able to mount the new image with -t vfat.

Unfortunately, I don't know exactly how big the MBR is; I think it's a few kilobytes but it may be less than this. You may want to try and find this out before dd-ing copies of the file.