A couple points:

1. IT must be burned as an iso image. Somewhere in your cdrom burning software there is a

Make image
pr
Burn iso image

or some such. That is what you must burn it as..not a data file, been there done that

UNSUCCESSFULLY!

2.

PMI is simple, but when run from that partition, it will NOT allow writing to that partition, but will any other 'linux nativer' partitions.

boot: tohd=/dev/hhaX where x is the partition nunber

then next time to use that partition image

boot: fromhd=scan

and it will find it usually IF you didn't hide it in a folder inside the partition.