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Re: dd: error reading '/dev/sr0': Input/output error



Hi,

md wrote:
> [] sr 4:0:0:0: [sr0] tag#20 Sense Key : Illegal Request [current]
> [] sr 4:0:0:0: [sr0] tag#20 Add. Sense: Read of scrambled sector without authentication
> [] sr 4:0:0:0: [sr0] tag#20 CDB: Read(10) 28 00 00 3b 23 c0 00 00 40 00

This is probably CSS access restriction.

I guess that dvdbackup is aware how to talk the drive into descrambling.
Some traces in the web point to libdvdcss as helper.
Best looking, content-wise is:
  https://cromwell-intl.com/technical/how-to-copy-dvds.html

So it seems not to be a bug but a feature. (Ain't it nice that dvdbackup
can lend its cracking result to subsequent programs ? So we others can
stay out of jail ...)


> libburn : SORRY : SCSI error on read_10(1216,32): See MMC specs: Sense Key 5
> "Illegal request", ASC 6F ASCQ 03.

That's what the sr driver received, too:
  5 6F 03 READ OF SCRAMBLED SECTOR WITHOUT AUTHENTICATION

(I should teach libburn to emit the cleartext. ASC 6F has 7 ASCQ variations.)


Have a nice day :)

Thomas


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