Makes sense. I was aware of 512e. I believe it’s one of the tricks that was invented to make Advanced Format drives play nicely with Windows XP.
I am planning to remove the 3 TB drive from mine and dump the MyBook enclosure for various reasons. I suppose that means the drive will not work with Windows XP as-is. But that’s OK. I don’t plan to use it with Windows XP at all. The only OS’s I really use any more are Windows 7 and Ubuntu, both of which support Advanced Format drives natively.