To my knowledge you can't put a partition on a CD-R or RW. However, DOS can read the ISO 9660 standard. You would need device drivers loaded for the CD-ROM of course. Any program such as Nero or Roxio can write with the ISO 9660 file system. DOS may be able to read the Joliet file system, I really can't remember. I don't think there is a packet reader for DOS to use UDF though. Perhaps someone could correct that statement if they know more?