shsucdx [/D:driver[,drive][,unit],[maxNumDrives]]
The driver-to-DOS extender for CD drives. Use this (and a CD driver) so that CD drives can be accessed from DOS.
driver The alias of the CD driver, which is specified when the driver is loaded. See below, Loading a CD driver. drive The first CD drive will be assigned to this drive letter, then subsequent drive letters will be used for any other CD drives that are detected. unit Selects the first drive unit of those detected to be assigned to a drive letter. This is a number from 0 to 99. maxNumDrives shsucdx will not assign more than this many drives to drive letters.
Note that shsucdx will only detect drives that are compatible with the specified driver.
For IDE CD-ROM drives (most common) FreeDOS includes ATAPICDD.SYS (still in the development stage though). You may have a driver on your CD Drive's installation disk, or on the manufacturer's website. There are also various clone and generic drivers on the internet.
DEVICE=MYCDDRV.SYS /D:SHSU001Please refer to your driver's instructions for details on installation.
For more information, see readme.cdx