Hi Peter,
> > dd of=/mnt/cdscratch/somecd.iso if=/dev/cdrom
>
> But can this disc be used in Mac? Do Macs understand iso-format cd's?
dd makes a byte by byte copy of the device (=cdrom). As long as there is no
protection data in the subchannels you can treat the image as an exact copy of
the original disk.
A little more on this: A CD uses sectors with a physical size of 2352 bytes
and a logical size of 2048. dd will copy the logical sectors (2048 bytes),
which hold the actual data on the CD (same for ISO, HFS or whatever filesystem
type). Protection schemes use the bytes in the subchannels (the other 2352 -
2048 bytes) as well to make duplication of the disk harder.
If it is more reassuring to you, you could issue a
dd if=/dev/cdrom of=/mnt/cdscratch/somecd.hfs
;-).
Bye,
Leonard.
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