JPNpower :
JN77,
SanDisk and Toshiba produce and develop flash together.
What makes you say SanDisk is lagging? Their sd cards are awesome, and they practically dominate the NAND market
I guess because I am a power user and back at CES or one of the tech expos in 2008 some companies showed off 128,256,512gb and 1 and 2 TB MicroSDXC cards, so we know they exist.
Yet Sandisk and Toshiba, or other flash memory providers are not releasing 128gb and higher flash products on a consistent basis.
Apple (as much as I love them) has come out with a 128gb Ipad, Samsung has not come out with a 64gb or larger Nexus tablet,
The GS3, GS4 and Note 2 support ExFAT so they can accept 64gb + storage cards. I would love to purchase a tablet that has 128, 256,512gb or even 1Tb of storage on it, and I would like to see those MicroSDXC cards in those sizes too. (64gb does not cut it anymore).
Maybe with the UHS Class II read and write speeds, we will start seeing the larger cards come out.