The word "block" is extremely generic and the semantics and sizes of "blocks" vary widely across different storage technologies, platforms and specific parts.

The word "block" is extremely generic and the semantics and sizes of "blocks" vary widely across different storage technologies, platforms and specific parts. It's like saying "packet" -- there are a gazillion packet types, sizes and formats, and when I use the word "packet" I don't expect everyone to assume I'm just talking about ethernet framing, even though that's a really popular packet format.