On Mon, Mar 14, 2016 at 11:11:31AM -0600, jd1008 wrote:
> Hi all,
> time dd if=/dev/sr0 of=Our_Group_Picnic.iso bs=64M skip=5888
> conv=noerror,notrunc oflag=append
> dd: ‘/dev/sr0’: cannot skip: Invalid argument
> 0+0 records in
> 0+0 records out
> 0 bytes (0 B) copied, 0.000301689 s, 0.0 kB/s
>
> but
>
> {3464-jd@localhost}$ time dd if=/dev/sr0 of=Our_Group_Picnic.iso bs=64M
> conv=noerror,notrunc
>
> works just fine.
5888 * 64M is 368 GiB. Is your optical disk really that big?
For a smaller skip it should work just fine. On my system with a DVD:
$ strace -o /tmp/tr dd bs=64M skip=5888 count=3 if=/dev/sr0 of=/dev/null
dd: ‘/dev/sr0’: cannot skip: Invalid argument
$ strace -o /tmp/tr dd bs=64M skip=1 count=3 if=/dev/sr0 of=/dev/null
3+0 records in
3+0 records out
201326592 bytes (201 MB) copied, 44.0739 s, 4.6 MB/s
$
--
"I do not resent criticism, even when, for the sake of emphasis,
it parts for the time with reality".
-- Winston Churchill, House of Commons, 22nd Jan 1941.
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