Subj : Data Offset on Media
To   : warmfuzzy
From : poindexter FORTRAN
Date : Fri Aug 15 2025 13:01:16

  Re: Data Offset on Media
  By: warmfuzzy to All on Fri Aug 15 2025 05:51 pm

 > It is possible to burn a DVD/CD?BDR such that there is a hidden file system
 > within the disc using the slack space that is not mapped onto the disc.  So
 > this is how it works: -R discs are not used in this hack, but rather discs
 > known as -RW's ("rewritables") where you can write the disc multiple times.


I wonder if you could create an extended filesystem on rewriteable media? Create an extended partition as a container, then create a visible partition and a "hidden" partition filled with junk. That would get you the full "looking" DVD.

I think of some of the cool things Veracrypt does, like having containers within containers, encrypting entire devices - and wonder if some of those tricks would be possible?

Being able to mount what looks like free space on a drive as an encrypted volume would be wild.
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