In article ,
Ian Field wrote:
Pretty sure something nasty would happen if I tried for more than 2.2Gb
partition - but I can't even get that.

I was thinking more along the lines of 2x 1.5Tb partitions.

That _may_ be workable, but you're probably going to have to do
more math, and become more familiar with the PC Master Boot Record
and how to hack it.

Setting up the MBR to work in LBA (logical block address) mode,
rather than C/H/S, would probably make things easier.

Again, it's going to depend a lot on your PC and its device drivers.
If it's capable of accessing the drive in LBA48 mode (with a 48-bit
logical block address) you may get away with it. If not, you may be
stuck with 2.2 terabytes at most.