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Old 07-09-2017, 08:22 AM   #1
Lins
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Why does dd not copy the whole optical media like it does hard drives?


I was making backups of some optical disks I have, and something I noticed is that dd doesn't copy the entire disk. For example, cds are roughly 768MB, but dd doesn't give me 768MB ISOs when it's done.

I don't think anything is necessarily wrong because when I did an md5sum on the device, I still get the same checksum value on the device as I do on the ISO file created by dd, but it was something that peaked my curiosity.
 
Old 07-09-2017, 08:34 AM   #2
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It does copy the whole media. Unlike, say, hard disk drives any space not used on CDs isn't blank it's just not there.
 
  


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