I am using AMD 1.2Gig w/ 512Meg Ram, MSI 6330-K7ProA motherboard.

hda: QUANTUM FIREBALLP LM10.2, ATA DISK drive
hdb: IBM-DPTA-372050, ATA DISK drive
hdc: ATAPI 52X CDROM, ATAPI CD/DVD-ROM drive
hdd: PLEXTOR CD-R PX-W8432T, ATAPI CD/DVD-ROM drive

base install is Mandrake 8.0 from CD
it did not work and then tried latest cooker kernel 2.4.5-8 same thing.
I have also tried redhat 7.1 with all recommended updates 2.4.3-12 kernel 
same thing.

using ide-scsi module.
SCSI subsystem driver Revision: 1.00
scsi0 : SCSI host adapter emulation for IDE ATAPI devices
  Vendor: PLEXTOR   Model: CD-R   PX-W8432T  Rev: 1.09
  Type:   CD-ROM                             ANSI SCSI revision: 02

when trying to mount a CD in the plextor the system accesses the drive for a 
few seconds then hangs the process hangs and can not be killed.
If I use X-CD-Roast it tries to access the drive and after a few seconds the 
CPU goes to 100% usage and hangs the machine, have to hard reset it can not 
sys-req it either.

The other CD-Rom drive works great.

This setup works great under a dual boot of Windows 2000, and I can access 
the drive and burn CD's all day long.

cdrecord --scanbus see's the drive the until the first time I try to access 
it the drive, then cdrecord --scanbus hangs.

Cdrecord 1.9 (i686-pc-linux-gnu) Copyright (C) 1995-2000 Jörg Schilling
Linux sg driver version: 3.1.17
Using libscg version 'schily-0.1'
scsibus0:
        0,0,0     0) 'PLEXTOR ' 'CD-R   PX-W8432T' '1.09' Removable CD-ROM
        0,1,0     1) *
        0,2,0     2) *
        0,3,0     3) *
        0,4,0     4) *
        0,5,0     5) *
        0,6,0     6) *
        0,7,0     7) *

I will attach my dmesg...

Please help.
Thanks
Jorg