4
votes
2answers
57 views

why do people use “notrunc” when making an ISO from a DVD?

There are many articles on the web that describe a command-line to make an ISO image from a DVD-Video disc like this: dd if=/dev/sr0 of=mydvd.iso conv=noerror,sync,notrunc I'd like to uderstand why ...
1
vote
2answers
524 views

Can I use dd to make an ISO of a DVD that is only as large as the data on the DVD?

I am starting to make backups of my movie DVDs at home. I am using DD to make ISO images of my DVD as follows: dd if=/dev/dvd of=~/dvd/abc.iso However, even though the content of the DVD is only, ...
4
votes
2answers
4k views

Why can't I copy my DVD with dd?

I tried dd, dd_rescue and ddrescue, all failed. I thought these tools bypass the filesystem and make a bitwise copy. dd is fooled, it finishes but just produces a small file and states it's finished. ...