kmdb is working fine with the DVD solaris x86 installation file but
when I tried to download the 5 files for Installing u5 of solaris 10
on PIII. I tried the GRUB command kmdb instead of cdrom with the first
CD but with installing from CDs the PC totally hang up after issuing
the GRUB kmdb though it worked fine with the DVD file .

Is kmdb command related with installing from DVD ?

Should I gather them with copy /b and copy the ISO file generated to
DVD burn file and try again kdmb.