Originally posted by knoxploration Let me ask you this... What reason would the SD Association have for stating that a firmware update wouldn't be possible and that a hardware update would be required, if that were not actually the case?
What the SD Card Association's web site states is that specific hardware will be needed to be able to read SDXC cards at 300 mbytes/s. Not that SDXC cards will be unreadable in SDHC readers.
Maybe you should re-read the SD Card Association's web site from a different point of view. This isn't a conspiracy, they're just trying to explain difficult technical concepts to people who have no understanding of such things. Most people don't differentiate between the block device and its file system. To them, it's all the same thing. If you actually look at the technical specifications, you'll find that SDHC and SDXC are actually pretty much identical right now.
Originally posted by knoxploration They stand to gain an advantage out of having more products capable of accepting SDXC cards, after all. (If existing SD/SDHC devices could accept SDXC cards, there would be an instant market for the cards, and quicker adoption of the format).
Wrong, they gain nothing if SDXC cards don't give consumers an immediate tangible improvement. It's a new technology, so it must be better right away, otherwise consumers will complain. When 300mbit/s cards actually exist, they'll only be that fast on SDXC readers, so the best way to show their new product in a good light is to make sure everyone has SDXC readers to use them with.
The idea right now is to prevent hapless users from turning their precious SDXC cards into SDHC cards by accidentally formatting it. By stating that users should only use SDXC cards in SDXC readers, they ensure that the operating system has an appropriate driver for the reader, and that it properly supports the exFAT filesystem (that's the vital part, OS X doesn't support exFAT yet).
Originally posted by knoxploration They're also the only ones who are aware of what the 4.0 spec contains, as it hasn't been publicly released yet.
Sure it has, it's been a draft specification for months. They've been telling everyone about all the great new things that have been added to the specification to make it better than Sony's Memory Stick and so on. It's not a trade secret, it's not a mystery, it's been in the public eye for ages. And the big thing they added was that extra pin, which enables 300mbytes/s transfer speed. No-one's going to be surprised when the SD 4.0 spec comes out, it's already been discussed to death. They're only finalizing the details, not changing it.