Just to maker sure that this bug is not related to any common issues with old CD-ROM drives.
K3b was the burning application (for maximum speed) in my previous install trials.
1. Lower Disc write speed:
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I burned two more discs with the i) previous used Samsung Writemaster and ii) the Packard Bell NEC built-in CD/RW. Now I used 'wodim' with a comand line like so:
wodim -dao -speed=4 -eject dev=/dev/sr0 i386/iso-cd/debian-wheezy-DI-b2-i386-netinst.iso
With i) the wodim reported the write speed to be 2838 KB/s and with the internal Packard Bell NEC CD/RW ii) 706 KB/s.
No wheezy beta-2 boot with these two discs
either. Same 'Boot Record' ... 'Not Found' message.
2. DMA settings
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During boot (with the installed wheezy beta-1) the boot up screen say:
Hard
Disk(s) Cyl Head Sector Size LBA 32Bit Block PIO UDMA
Primary Master: 13410 15 63 6489MB LBA Off 16Sec 4 2
Secondary Slave
CDROM 4 N/A
Thus I assume that DMA does not to come into play as an issue for the CD-ROM.
Cheers
Bertil