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#11
OK, thanks for the update. Good that you also put out the screenshot of PW.
1. Was it showing only 2 TB before?
2. In your first post you had mentioned that you used some Seagate software. Can you specify what exactly was that software? I have to check on it. You may also post the link.
Run Partition Recovery wizard again. Do it at your leisure when you have enough time to run the Quick scan. ( you can cancel the scan/wizard anytime and that is not going to affect your data. Even if you had deleted some partitions earlier, the data will still be there. So let us try.)
When the Partition Recovery Wizard finds all the partitions, post a screenshot. If it does not add up to 4 GB then we have to give up and take recourse to using PhotoRec where data recovery does not depend upon the file system. But it is going to be an excruciatingly long scan.
Before running Partition Recovery Wizard again, please take your time to read How to perform lost partition recovery and deleted partition recovery under Windows? Partition Recovery Help.
At the moment I am inclined to think that Partition Recovery Wizard is unable to deal with GPT or your HDD got messed up by the Seagate software before.