The issue is that with these cards they're not just branded wrong, they often present themselves as being bigger than they actually are - so your OS sees it as

The issue is that with these cards they're not just branded wrong, they often present themselves as being bigger than they actually are - so your OS sees it as being 64GB when it's only 16GB, for example. Were it just a branding thing it wouldn't - from a technical standpoint - be quite so bad, other than you know, the intentional lying...