On Sat, 21 Dec 2002, Mike Jeays wrote: > Subject: Copying a CD > > How can I use dd to copy a CD? The command below does not > work - I presume I have failed to understand something. I have tried other > devices begining "acd". > > 209 ~# dd if=/dev/acd0c of=x1 > dd: /dev/acd0c: Invalid argument > 0+0 records in > 0+0 records out > 0 bytes transferred in 0.000219 secs (0 bytes/sec) > 210 ~# > 211 /dev# ls -l acd* > crw-r----- 4 root operator 0,13568 Dec 21 2002 19:33 acd0a > crw-r----- 4 root operator 0,13568 Dec 21 2002 19:33 acd0c > 212 /dev# ls -l racd* > crw-r----- 4 root operator 0,13568 Dec 21 2002 19:33 racd0a > crw-r----- 4 root operator 0,13568 Dec 21 2002 19:33 racd0c > 213 /dev# >
On my hardware (ASUS board / Plextor CDRW) I need to specify the block size with the 'bs' switch as in $ dd bs=2048 if=/dev/acd0c of=x1 or I get the same results you do above. I'm not sure what happens if you use different block sizes, but the above allows me to e.g. make copies of Linux and BSD ISOs. HTH - JB # John Bleichert # http://vonbek.dhs.org/latest.jpg To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-questions" in the body of the message
