Windows Home Premium 7 HDD bootable, usable, fully accessible - can't be seen on Windows 10 Pro

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LJ_Prosaic

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2 weeks ago I upgraded to Win10 Pro (64 bit) from Windows 7 Home Premium (64 bit)


I pulled my 1TB Win7 HDD and replaced it with a 1.5TB HDD and installed WIn10 Pro fresh. Everything went fine - with only a minor hiccup of my Win10 installation didn't recognize my new HDD, so I used diskpart from the command line to clean it, and that worked.


Fast forward to having all my stuff installed, and I pulled out my 5TB external backup drive and hooked it up. Nothing. No media. I assumed the drive had died (unfortunate) but I had 95% of my data on two other internal HDDs (6TB & 8 TB) - so I grabbed my old 1TB win7 HDD and hooked it up via a USB cable to get the remaining data. Nothing. NO MEDIA. Asked if I wanted to format the drive.


I used a few free utilities to scan the drive, finding oodles of data. Not wanting to screw up the drive, I did nothing further with those utilities, and instead I pulled out my Win10 drive, and replaced it with the Win7 drive - and it booted! ALL my data was there! And when I connected my 5TB external drive - it was also there! ALL the DATA was readable and executable on both drives!


So I copied the roughly 300 GB of data I wanted from the Win7 drive to the internal 8TB HDD, in a folder named "From_win7". I figured this is an unusual problem, but I just wanted my data - I don't have to "fix" it if I can just get my data. When the copy finished, I pulled the Win7 HDD, and replaced it with the WIn10 HDD, and booted it back up. The folder I had copied to the 8TB drive WASN'T THERE. It wasn't simply empty - the ENTIRE folder was missing. I made sure I could see hidden files and even system files - but no change. The folder isn't there (on Win10 boot), when it was 5 minutes previously (on a Win7 boot)!

WHAT is going on here?!?!


So I have been crawling around the Internet looking for help. This seems to be a unique problem (unfortunate).

I have changed USB ports, and changed drive letters on both the Win7 drive (connected as external via USB) and the 5TB external backup drive. I have uninstalled my 5TB external drive (Seagate Backup SCSI drive) and rebooted. No love. I have installed the Paragon Driver supplied by SeaGate - no change. I have searched high and low and everything tells me my drives are simply "corrupted" - EXCEPT when I boot to the one corrupted drive with no problem, the other "corrupted" drive is also visible. Obviously, they are NOT corrupted.


To sum up - Win10 will not see my Win7 drive, treats it like a lost partition or a corrupted drive, will only offer to format it. Win7 drive is actually bootable and fully usable when not being used as an external drive by my Win10. Copying my Win7 data I wanted to a different internal HDD resulted in it only being visible when booting to Win7, but not when booted in Win10.


My drives:

1 TB Win7 drive --> boots to Win7 when installed on the PC. All data accessible in this state. When connected as an external drive to Win10, seen as corrupted or empty

1.5 TB Win10 drive --> boots to Win10. Updated with all the latest.

5 TB external Seagate SCSI USB 3.0 drive --> seen as "No Media" on Win10, all data accessible on Win7

8TB internal HDD --> holds data. Fully visible and usable on both Win7 & win10 - but data I copied to this drive from Win7 boot not seen on Win10

6TB internal HDD --> holds data. Fully visible on both Win7 & win10.


My PC is a Dell Optiplex XPS with an i7 and 16GB of RAM.

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