Hi, As mentioned in the manual ( https://www.gnu.org/software/ddrescue/manual/ddrescue_manual.html#Optical-media), ddrescue cannot read row CD sectors. You can try dvdisaster instead.
Cheers, Adrien On Wed, 4 Jun 2025, 18:19 Xavi Danto, <[email protected]> wrote: > Hey, > > I'm working on a CD reformatting project for Pratt Institute Libraries, and > I came across a batch of CDs with a Device Block Size of 2352 Bytes, as > noted in the text document attached. Our usual command has been the > following: > > ddrescue -r4 -b 2048 -v /dev/disk# /path/to/diskImageName.iso > /path/to/diskImageName.log > > I tried changing 2048 to 2352, but the response was the same, "Unaligned > read error. Is sector size correct?" > > Let me know how I should troubleshoot this issue? > > Many thanks, > Xavi Danto > > -- > Xavi Danto (pron. zay-vee dan-toe) [They/Them/Their] > > Pratt Institute > 200 Willoughby Avenue · · Brooklyn, NY 11205 > <https://www.google.com/maps/search/200+Willoughby+Avenue+%C2%B7+%C2%B7+Brooklyn,+NY+11205?entry=gmail&source=g> > [email protected] > <https://www.pratt.edu/> >
