(Posted by roberts in the forums)
I do not use the qemu-img program. Instead I do everything from DSL.
To make the pseudo harddrisk I used the following 2 steps from DSL.
dd of=harddisk bs=1024 seek=60000 count=0
mke2fs harddisk ( ignore the warning and proceed )
There are files on the default 60MB harddisk. The backup.tar.gz is there.
Since qemu is a "known" virtual machine, it has a pre-made backup.tar.gz on hdb The sound blaster modprobe is in the opt/bootlocal.sh.
If you make a larger pseduo harddisk, with a different name of course, then mount both the 60MB and your new one.
Something like this:
mount harddisk /mnt/test -o loop
mount newdrive /mnt/test2 -o loop
Then copy over the backup.tar.gz.
cp /mnt/test/backup.tar.gz /mnt/test2
Then you can delete the 60MB one, rename the larger one to harddisk and you should be good to go.