In message , Andy Burns
writes

With 4kB clusters, the maximum partition size is 16TB, regardless of
whether windows is 32 or 64 bit, but to use a disk larger than 2TB, it
needs to be partitioned as GPT rather than MBR, and if you want the
disk to be bootable you need to have UEFI rather than BIOS.

Excellent, thanks. I'm looking at, for example, eBay item 333315265003
which is a Seagate Expansion 4TB 5900 RPM USB 3.0 Desktop Hard Drive,
and Googling tells me I can use Windows to change a disk from MBR to GPT
partition as long as the disk contains no partitions or volumes, so
should be good to go (no need for disk to be bootable). He says,
hopefully.

https://www.ebay.co.uk/itm/Seagate-E...USB-3-0-Deskto
p-Hard-Drive-Black/333315265003?epid=153394441&hash=item4d9b2351eb%3A g%3A
Na4AAOSwRtNbiO1G&LH_BIN=1

--
Graeme