Dos box wiki says this:
Then run the installation programs (pretty obvious )DOSBox wiki wrote:CDROM support under DOSBox
Many people experience problems with getting games running which require a cdrom. If you are one of them read this section.
Basic cdrom support:
mount D D:\ -t cdrom
SDL-cdrom support:
mount D D:\ -t cdrom -usecd 0
Ioctl cdrom support:
mount D D:\ -t cdrom -usecd 0 -ioctl
ASPI cdrom support:
mount D D:\ -t cdrom -usecd 0 -aspi
Change the 0 in -usecd 0 to the number of your cdrom drive reported by mount -cd
Try basic support first. Second in line is SDL-support and finally IOCTL/ASPI support.
IOCTL support is for Windows NT/2000/XP/2003 or linux.