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Is there a tool I can see to see which parts of the file are being modified? I've seen tools that show me which segments of my hard drive are being accessed, but I want something similar for a single file, if something like that exists.
I'm encrypting a file and I want to see if, once a part is written to disk, that part ever changes again. For example, once the first MB of the file is encrypted and saved to disk and the program moves on, is anything in that first MB updated once encryption is done.
As some detailed context, I have a process where I use gpg4win to encrypt a very large file (36GB), and then I have to FTP it to a remote server. Both steps of this process take many hours, but the FTP takes a bit longer. If encryption just keeps extending the file, but the beginning remains unchanged, then I can start the FTP process as soon as the file is just a little ways in. If the header on my encrypted file gets updated at the end, though, I have to wait until that steps is complete before I start the upload.
There hundreds of hex editors out there. It might be easier to encrypt a similar but smaller file instead of try to load two 36GB files into memory. – Ramhound – 2014-07-01T15:49:31.857
@Ramhound I'd test with a smaller file, so I suppose I'm asking for concept - just wanted to explain my end goal. I've rearranged my question a bit so it's more clear. – SqlRyan – 2014-07-01T16:02:43.617
Possible duplicate of Binary Diff Tools On Windows or How do I compare binary files in Linux? – Breakthrough – 2014-07-01T16:08:42.757