Hi, On Tue, 29 Jun 2021 12:08:13 +0200 "Thomas Schmitt" <scdbac...@gmx.net> wrote:
(...) > > > For data-discs I finally found a recipe that seems to > > work in the archives of debianforum.de : > > $ wc -c whatever.iso > > 8237400064 whatever.iso > > $ dd if=/dev/sr0 | head -c 8237400064 | md5sum > > Yes. See also the FAQ about Debian ISO images: > https://www.debian.org/CD/faq/#verify > > The trick is to curb the reader to the size of the ISO image for which > you know the checksum. > The ISO images themselves contain a data field with their filesystem > size. This may or may not be the size of the ISO image file. > So it is better to record both, image size and checksum for the purpose > of later verification. thanks for the detailed explanation. I managed to wrap these commands in a little script, so now I can do this with a single command, I think this wil do the trick for my purpose. > > Unfortunately there is apparently no way to control the reading > > speed here, so maybe one should be careful with these Pioneer > > drives :) > > You would need a filter program which takes care not to read more than > ~ 20 MB/s. Then the drive slows down automatically. > > (It is not decided who is at fault with the BD-RE cracks: Pioneer or > Verbatim or both ...) I see, that does not sound trivial, at least to me :) Fortunately there seems to be no danger with the Asus drive here, it does not sound like it is spinning unreasonably fast when when using dd, so I think it should be save just to skip this step. > > So, does anyone know about a way to verify the integrity of burned > > audio-CDs? > > Success is normally judged by playing the CD on the intended player > device, which in most cases is not the CD burner. > > > Difficulties are to be expected if you want to verify the burn success > by audio data comparison: > (...) Ok, I thought so. Checking success by listening to the CD playing on my stereo will be good enough, I guess. And I`ll just assume that if data discs are ok the same will be true for audio-CDs. So far the Asus managed to pass all tests, so probably I should just be grateful to all the transcendental authorities that guided my hand when I picked that carton from the shelf :) Thanks again for your patience, and have a nice day :-) Michael .-.. .. ...- . .-.. --- -. --. .- -. -.. .--. .-. --- ... .--. . .-. Compassion -- that's the one things no machine ever had. Maybe it's the one thing that keeps men ahead of them. -- McCoy, "The Ultimate Computer", stardate 4731.3
