I can confirm the problem with natty alternate i386 cd on CD-R using a Plextor PX-800 as first IDE device (and a md software RAID on SATA HD's).
Burning the ISO on a CD-RW instead of a CD-R did help.
I can confirm the problem with natty alternate i386 cd on CD-R using a Plextor PX-800 as first IDE device (and a md software RAID on SATA HD's).
Burning the ISO on a CD-RW instead of a CD-R did help.