How to make a .iso file from your CD or DVD
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To make an ISO from your CD/DVD, place the media in your drive but do not mount it.
If it automounts, unmount it.
for DVD:
dd if=/dev/dvd of=dvd.iso
for CD:
dd if=/dev/cdrom of=cd.iso
SATA device
dd if=/dev/sr0 of=file.iso
SCSI device:
dd if=/dev/scd0 of=cd.iso