I’m not sure I’m following, what was the technological leap here? I know that the SD, SDHC, SDXC, etc. are marketing terms and their limitations are based on other factors, much of the previous ones are file system related.

• SD - FAT16 Volume size limit, Practical limit 2GB, Max limit 4GB
• SDHC - FAT32 limit Set at 32GB by Microsoft (fake limit)
• SDXC - 2TB limit, Maximum partition size for MBR partition Scheme.

I assume that it’s a similar story here but it might not be, if so I’m curious as to what changed.