On Mon, 10 Dec 2018, Thomas Schmitt wrote: > Date: Mon, 10 Dec 2018 02:45:43 > From: Thomas Schmitt <scdbac...@gmx.net> > To: debian-user@lists.debian.org > Cc: mickyd...@protonmail.com > Subject: Re: dd: error reading '/dev/sr0': Input/output error > Resent-Date: Mon, 10 Dec 2018 07:46:23 +0000 (UTC) > Resent-From: debian-user@lists.debian.org > > Hi, > > md wrote: > > When copying a dvd to file on the harddrive, I'm getting [...] > > MD> sudo dd if=/dev/sr0 of=/sdb1/movie.iso > > 32596480 bytes (33 MB, 31 MiB) copied, 7.00018 s, 4.7 MB/s > > dd: error reading '/dev/sr0': Input/output error > > Do you see fresh messages in the output of dmesg ? > Like > > Dec 2 13:56:33 ... kernel: [...] Sense Key : Medium Error [current] > Dec 2 13:56:33 ... kernel: [...] Info fld=0x69c0 > Dec 2 13:56:33 ... kernel: [...] sr 2:0:0:0: [sr0] > Dec 2 13:56:33 ... kernel: [...] Add. Sense: Unrecovered read error > Dec 2 13:56:33 ... kernel: [...] sr 2:0:0:0: [sr0] CDB: > Dec 2 13:56:33 ... kernel: [...] Read(10): 28 00 00 00 69 b8 00 00 40 00 > > What do you get from > > xorriso -outdev /dev/sr0 \ > -check_media use=outdev \ > data_to=/sdb1/movie.udf \ > -- > > (It will at least show error messages directly.) > > > Gene Heskett wrote: > > Classic slow spinup. > > After 33 MiB of reading ? > > (We have a bug in the kernel since 2008 which prevents waiting for the > drive to become ready after automatic tray loading. But this causes > 0 bytes of read result and lets dd end immediately.) > > > > You can get a better dvd drive > > Read failures of decaying drives often show surprising success-or-error > patterns. Depending on how idvdbackup accesses the drive, its doings > might be beneficial. > But reading in > > http://manpages.ubuntu.com/manpages/bionic/man1/dvdbackup.1.html > "-M, --mirror > backup the whole DVD" > > i'd expect it to read sequentiall, like dd does. > > So more questions to md: > > - Does a second or third dd run yield success if no dvdbackup was run > inbetween ? > > - Does dvdbackup yield a complete set of files if you let it work > until it ends on its own ? > > > Have a nice day :) > > Thomas > Why not prefix that dd command with a sudo udevadm settle command and only allow the dd command to run on success case?
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