Tony,

The 2 GB limit maybe is due to DOS (yes, our old PCs operating system) compatibility. Korg keyboards has always been compatible to DOS (for diskette loading, computer operation assistance etc). The largest disk partition that DOS can see is 2 GB only due to FAT16 limitation.

By the way, Yamaha PSR9000 can recognize up to 8 GB of hard disk space and can only partition up to 2 GB for each disk partition.
I guess this is no coincidence here.

Paul Ip
from Texas