Having problems loading drivers for Mitsumi FX120T CD/ROM

Since the original hard drive died in my Dimension XPS M200s, I had a new hard drive installed. After partitioning and formatting the hard drive (including SYS C:), I tried to install Windows 98 SE from the CD after booting from a Windows 98 Startup disk.. I got error opening drive D:

I read the README file on the Startup DIsk and it said that the CD/ROM drivers it loads may not be compatible with certain CD drives from Mitsumi. So I got the backup diskette containing the Mitsumi drivers and installed them on the hard drive. I then edited the AUTOEXEC.BAT and CONFIG.SYS files on the Win 98 startup diskette as follows:

AUTOEXEC,BAT

@ECHO OFF
set temp=c:\
set tmp=c:\
path=c:\;a:\
set comspec=C:\command.com
C:\MSCDEX.EXE /D:MTMIDE01 /M:10
echo.

CONFIG.SYS

device=a:\himem.sys /testmem:off
rem=device=C:\MTM\MTMCDAI.SYS /D:MTMIDE01

[COMMON]
files=10
buffers=10
dos=high,umb
stacks=9,256
lastdrive

The system boots successfully, and based on the messages, it appears that the CD/ROM drivers have been loaded, but I still get the error opening drive D:

I hoping that I'm just making a small error, since it's been a long time since I had to mess with these DOS entities. Can anyone help me out?