Re: dd: error reading '/dev/sr0': Input/output error
> 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 ?
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 \
(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
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
- Does dvdbackup yield a complete set of files if you let it work
until it ends on its own ?
Have a nice day :)