Have you either tried disabling DMA on the drive?  This is easily achieved
by the following (whitespace mangled):

--- atapi-all.c 1999/10/10 18:08:38     1.19
+++ atapi-all.c 1999/10/23 16:51:12
@@ -135,7 +135,8 @@
                               udmamode(atp->atapi_parm),
                               atp->atapi_parm->dmaflag);
-               if (!(atp->atapi_parm->drqtype == ATAPI_DRQT_INTR) &&
+               if (atp->atapi_parm->device_type != ATAPI_TYPE_CDROM &&
+                   !(atp->atapi_parm->drqtype == ATAPI_DRQT_INTR) &&
                    !ata_dmainit(atp->controller, atp->unit,
                                 (apiomode(atp->atapi_parm) < 0) ?
                                 (atp->atapi_parm->dmaflag ? 4 : 0) : 


-- 
 Brian Fundakowski Feldman           \  FreeBSD: The Power to Serve!  /
 [EMAIL PROTECTED]                    `------------------------------'



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