maybe this is more of a software question

I have a siI 3112 chip set to use two 500GB SATA drives in raid0 I have then partitioned one large ntfs partition on it and installed windows. I would like to change to linux, I installed a 80GB IDE drive and installed vector linux. I used mdadm to set up the raid using:
>mdadm --build /dev/md0 -n2 -c128 -l0 /dev/sda /dev/sdb

this seems to work correctly and says its running I do:
>cfdisk /dev/md0
this shows one partition md0p1 of type ntfs (since I never told it that the partition was ntfs I take this as a good sign.) so I do:
>mount -t ntfs -o ro /dev/md0 /mnt/windows and get an error about 'NTFS signature is missing.'

so taking from cfdisk md0p1 I try the same mount with /dev/md0p1 and receive a different error 'Failed to access '/dev/md0p1': No such file or directory'

what have I done wrong

PS: -c64 also provides the same error