DiskProbe is only for the more experienced users (the ones that
is familiar with the way their systems operate at the lowest level),
as it is capable of making files unreadable, applications unlaunchable,
system unbootable, and did we mention your life a living hell! No
seriously, it's an hex editor that can destroy all data on the disk.
So when you are editing single files (pictures, documents or applications),
make sure that you have a backup of the files.
This is a tool that lets you view and edit blocks on your hard
disk, wether they relate to individual files or the entire disk.
You can reach in to applications and change for instance the entries
in the menus or changing parameteres in configuration files.

When starting the application icon you will be asked if you want
to edit the entire disk or just single file. A rather safer way
to launch DiskProbe is by dragging the file you want to view or
edit on to the application icon. This will minimize the chances
of accidentally opening DiskProbe on an entire disk volume.
The file's content is shown in hexadecimal mode. As you can see
from the screenshot below, the path and icon of the file or device
viewed is show in the upper left corner of the window:

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