Enigma2Illusion

Correct. When you are unable to mount the volume by VeraCrypt. When unmounted, the data recovery software will read the encrypted unmounted volume as if it is dealing with data on an unencrypted drive/partition. This leads to the data recovery software corrupting the VeraCrypt volume as it tried to guess patterns that it thinks is unencrypted data.

Sorry. I am out of ideas. FYI: Do not run recovery tools against an unmounted VeraCrypt volume. This will corrupt the VeraCrypt volume.

Close VeraCrypt GUI. Then right click on the VeraCrypt and select Run as Administrator to attempt to mount the disk partition manually.

Are you manually mounting using the Select Device button? What is the full drive path? Example: \Device\Harddisk2\Partition1

Are you now able to mount the volume using either the primary header or the backup header (embedded header in the Mount Options)?

I hope you have a complete and successful recovery from your medical treatment. Does the device show-up in Windows Disk Management as a RAW partition? If Windows OS does not recognize the drive as connected, the drive has failed. You can Google search "I/O device error" to get troubleshooting steps. Do not use any tools to repair the drive/partition since this will destroy the VeraCrypt volume.

and the dates match the copy date This is very confounding that the file is corrupted without any date modifications. EDIT: What about the Modified & Accessed times being different from the original? END EDIT Is your BIOS up-to-date and all OS and third-party software drivers? EDIT 2: Is all your drives updated to their latest firmware? END EDIT 2

If you are using VeraCrypt system encryption, be sure to create new Rescue Disk after you upgrade/update the VeraCrypt software. Try to stay current on software releases. https://veracrypt.jp/en/Release%20Notes.html Notification Solutions Gary Marks solution is to get notifications from SourceForge whenever new software files are available. https://sourceforge.net/p/veracrypt/discussion/general/thread/0cc5a5acc6/?page=3&limit=25#9fcf/5393 Heribert Slama uses RSS feeds whenever new software files...