install on disk that goes in another computer

[Pierre Abbat <phma@xxxxxxxxxxxxx>]

A friend of mine gave me a 240 GB laptop hard disk with a USB connector. I'd 
like to put DragonFly on it and put it in my laptop. fdisk reports that it 
has a Linux filesystem and a swap slice, but attempting to mount it results 
in this:

# mount -t ext2fs /dev/da8s1 /mnt
ext2fs: /dev/da8s1: Invalid argument

Running file -s on the disk results in "Input/output error". Running it on the 
internal hard disk results in "DOS-executable", "data", and "LUKS encrypted 
partition"; the "data" is the Hammer partition. How can I install DragonFly 
on the disk?

Pierre
-- 
Jews use a lunisolar calendar; Muslims use a solely lunar calendar.