Hello, This drive is not mine, nor is the error that brought it to me. A friend of mine, I believe if the information I have is accurate, mistakenly thought this drive a 4TB my passport Seagate I believe, quick formatted it. The size is 4tb of which 3.63tb show up. I had him get another drive, this one a 4tb western digital I believe it's an easy store, this one also with 3.63 tb available. This format was done on a win10 machine. I've tried twice to recover anything using the free recuva program. Running a deep scan shows 27 files but it can't get any of them. Running for a better word the light scan shows the same 27 files, but in that case I can highlight them all, right click, choose recover selected. I selected the easystore drive and attempted a recovery. First issue it told me that I needed 3.63tb only 3.62 were available. The drive had some content from western digital on it, I moved it off the drive and tried it again. This time it said insufficient space needed 3.63tb available 3.63tb, numbers were identical, but it asked me if I wanted to try a different recovery path, which that's the only drive I've got that can recover such a substancial load. Then I thought well maybe when both the my passport was originally formatted/partitioned and accidentally quick formatted, maybe the cluster sizes were incompatible between the my passport and the easystore. So I went in to format, didn't do anything to either drive, but compared the cluster size, blew my theory away both have a cluster size of 4096k. I hit cancel so nothing more was done. I'm kind of stuck. It takes about a day for the initial scan, i'm assuming the same neartime for the recovery, this is my third attempt. I then got the idea of recovering each of the 27 individual files. Tried that and it said I didn't have permissions to perform the recovery operation, which makes no sense, I'm an admin on this box, also win10 pro, his win10 is home, but neither of those usb drives should be dealing with permissions, even though they're both ntfs. I'd appreciate any suggestions, I'm kind of stuck. Thanks. Dave.