Two issues to consider for starters.
1-You omitted 'current' from the bolded statement in its original form.
2-Good luck w/ your theory since the most current SDXC spec 4.0 requires an extra pin on the connector. If people think vendors will make 2TB SDXC cards supporting the older specs they will be disappointed.
"The Secure Digital Extended Capacity (SDXC) format was unveiled at
CES 2009 (January 7–10, 2009). The maximum capacity defined for SDXC cards is 2
TB (2048 GB). The older SDHC cards also have a maximum capacity of 2 TB based on the card data structures, but this is artificially limited to 32 GB by the SD 2.0 specification. The first SDXCs being released are governed by an SD 3.0 specification (which also still specifies
FAT32 and thus lower capacities), whereas higher capacity and faster SDXCs are expected to follow an SD 4.0 specification, which was due to be released in spring of 2010.
[45]
The maximum transfer rate of SDXCs which follow the SD 3.0 specification was announced as 832
Mbit/s (these are called
UHS104 speeds
[45]), with plans that the SD 4.0 specification shall increase this to 2.4 Gbit/s.
The SDcard association selected
Microsoft's
proprietary exFAT file system in the official SDXC specification;
[46][47][48] however, as with SD and SDHC, it is still a plain
block device and thus arbitrary partitioning and other file systems can be used, such as
ext4,
HFS Plus,
NTFS,
UFS, etc."
"In the 3.0 specification, the electronic interface of SDHC and SDXC cards is the same. This means that SDHC hosts which have drivers which recognize the newly used capability bits, and have operating system software which understands the
exFAT filesystem, are compatible with SDXC cards. The decision to label cards with a capacity greater than 32GB as SDXC and to use a different filesystem is due solely to the limitations in creating larger filesystems in certain versions of Microsoft Windows. Other operating system kernels, such as Linux, make no distinction between SDHC and SDXC cards, as long as the card contains a compatible filesystem.
SDHC and SDXC cards and hosts have these compatibility issues:
- Existing SDHC hosts will only support the SDXC cards at up to UHS104 speeds;[45]
- SDXC hosts are backward compatible with SD and SDHC memory cards.[61]
- The operating systems that currently support SDXC are: Linux (with a proprietary driver for the exFAT filesystem[62]), Microsoft Windows 7, Windows Vista SP1+,[61] Windows XP SP2 or SP3 with KB955704,[63] Windows Server 2008 SP1+, Windows Server 2003 SP2 or SP3 with KB955704, Windows CE 6+, and Mac OS X Snow Leopard (Intel-based)[64]"
http://en.wikipedia.org/wiki/Secure_Digital