without explain what this and without warning message?

yes is look like this:

And yes I selected without to know what this it and select dban:

then I realize something wrong, I hit Reset button but it to late, it delete partition on 2 hard drives
including 8GB USB flash drive that was connected on this moment
I restored partition with TestDisk 6 on 2 hard drives but not USB flash drive
the USB flash drive I restored from backup I have.
I suggest need some fu**ing warning message for example like this:
