I took a hard drive out of a laptop, connected via SATA to my motherbaord, added a letter to the data partition, and transferred well over 200GB of data to user files. When I finished the transfer, removed the letter, safely ejected the drive, and re-installed the drive back to its system, the files were missing.

I've tested this three times, same result. However, a USB transfer works perfectly fine. Reading files from the laptop drive works perfectly fine, too. It seems to be that the host OS can't read files written by windows 10 to its system.

Anybody have an idea as to why this must be? It seems to be a pretty major flaw, one that is terribly inconvenient and certainly does not exist in windows 7/8

Windows 10 Pro x64
-yes fully updated