Windows 10: Copied files in Computer B does not show up in Computer A

Hi All,
I have a strange problem. This is with two Win 10 computers and a 2.5in SSD
I have an internal connected directly to the motherboard 2.5in SSD 1TB in Computer A with WIN10 nothing else. So it is almost empty. I took it out because I wanted to copy a lot of files from Computer B. So I attached my SSD to Computer B via USB using an external "SATA to USB" adapter. Then I copied all the files 600GB in a folder that I placed in the Root folder. Noting that the 600GB is more than half of the capacity of the SSD. It went without any problem I even tried to open a few files after the copy from Computer B. It worked well. So I put my SSD back into Computer A connected to the motherboard as it was before.
But the folder where I copied all my files 600GB didn't show up in the root folder. Moreover, the drive seemed to be empty as it was before the whole process. I took it out again and connected it to Computer B again via USB. In computer B the folder still didn't shop up but at least it showed that the drive is occupied with something. I copied a few new files as a second attempt and put it back into Computer A again. The symptoms were exactly the same such as now folder in the root directory and no space taken. As an extra, the Windows started struggling to boot and said that it could not sign me into my account.

I have never seen anything like that before. For me, it seems that Computer B using the USB connection somehow damaged the file structure of the SSD that was originally in Computer A. So when I put it back into Computer A, it didn't work. But it did it at the second attempt again. Have you guys experienced something like that before or you know what happened in my case? Any help would be greatly appreciated.
Cheeers,
Csaba

:)

 

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