Hi, siso wrote: > I tried to write the debian-12.0.0-amd64-netinst.iso to cd using > cdrskin and xorriso but they both refused my command.
Righteously. The ISO is just too large for "700 MB" CDs. In https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1038440 i wrote a comparison of old and new storage usage in the ISO: 11.5.0 12.0.0 Growth /firmware 0 MiB 216 MiB 216 MiB /install.amd 67 MiB 138 MiB 71 MiB /pool 301 MiB 360 MiB 59 MiB Together with the minor file trees of the ISO this sums up to 738 MiB. > user@debian:~$ cdrskin -v -force dev=/dev/sr0 > ... > cdrskin: FATAL : Exceeding range of permissible write addresses (359856 >= > 359844) > cdrskin: FATAL : CDB= 2a 00 00 05 7d a0 00 00 10 00 : dxfer_len= 32768 > cdrskin: FATAL : Burn run failed You ran into a known bug of cdrskin which will be fixed by version 1.5.6. It did not even try to burn more than the official number of blocks. Nevertheless it most probably would not have worked, because 36 MiB of overburning is just too much for a "700 MB" CD. > And there it went, one good cd. FATAL indeed. Sorry for that. After fixing option -force i added quite some warning to the man page of cdrskin: -force Assume that the user knows better in situations when cdrskin or libburn are refusing because of concerns about drive or media state. Caution: Use option -force only when in urgent need. [...] It enables a burn run where cdrskin expects to exceed the avail‐ able media capacity. This is known as "overburn" and might suc‐ ceed on CD media with write type SAO. Too much overburning might be harmful to the medium and might make the drive unusable (hopefully only until it gets powered off and on). The man page of cdrecord mentions 88 seconds = 6600 blocks as halfways safe amount over the official medium capacity. The assessment of track sizes by libburn will be wrong if the written size reaches or exceeds 90 minutes = 405000 sectors. The overall medium size assessment by the Linux kernel is supposed to yield roughly the written size, but you should test this yourself with every over‐ burnt medium. First consider to use a medium with more capacity rather than trying to overburn a CD. There are "800 MB"/"90 minutes" CD-R which could take the ISO. One reason for being able to overburn at all are "900 MB"/"100 minutes" CD-R media. They cannot announce their full capacity to the drive, because together with the wasteful lead-in and lead-out areas they exceed the addressing limit of 100 minutes. Have a nice day :) Thomas
