Extreme Portable SSD 1 TB shows less free space than it should: 258 GB are missing!

Hi all! I finally found a solution for this. And it was mind-bogglingly simple…

Today (after months of frustration and inactivity in that matter), I once again had my hands on this SSD drive. It still showed the wrong size of free space: 900 MB free space on a 1000 TB SSD drive with only 571 GB data on it. That makes 428 GB missing…

So, here’s what I did:
I took a folder with 3 GB files in it and tried to copy it to the SSD. Of course, that did not work as there was not enough free space on the drive available.

In a second step, I took a folder with 700 MB data in it and tried to copy it on the SSD. The copying process started and during that I noticed that the free space value was updated from 900 MB to 426 GB!

So somehow there must have been an incorrect size value stored somewhere on the SSD, which was only updated to the correct value during the copying process!

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