> There are few classes of data, which are being carried in the disks, but
> must be prevented from being copied.
>
> For instance, Personal photos which I can store on a disk as a memory  of
> some occassion, which I may show people but, not allow them to copy!
>

Anything that can be read by a computer can be copied. You just have to 
decide how much security you are okay with. Even though your presence 
might stop an individual from copying content. You may never know what 
the computer is running, which could take periodic backups in the 
background.

The only way to protect anything from being copied by an individual is 
to plant it directly in their brain. I don't think such a technology 
exists yet, so we might just have to live with a small fraction of 
people copying the content.

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