I think ntfs/fat libs will have to be fixed some time
4KiB drives are the future if we like it or not
if you don't want to go 4KiB+WBFS
take a 512B drive and try either:
A) hybrid MBR/GPT
one small FAT partition for programs (HBC, USB-Loaders, ...) available via MBR+GPT (has to be smaller than 2TiB and has to be in the beginning of the drive)
one big FAT/NTFS/WBFS partition for games available via GPT only (afaik there is a loader (GX?) supporting GPT, but I dont know about hybrid)
B) without partitioning
no MBR, no GPT
one big FAT directly on the drive
you can try this out with any 512B drive regardless on its size
if it works it should work with 3TiB drives to
Afaik cios still do not support hubs for connecting drives.
(only for other devices like mics etc)
It would certainly be possible but I don't think that there will be much cios development
most drives >2TiB should handle the same
"multi drives" might work depending on internal setup butI wouldn't bet on it
considered using network for movies?
Along the lines of working drives, I just bought the new Western Digital 4TB USB2.0/3.0 My Book HDD (Staples $199.99). Works perfectly formatted to FAT32 with Cfg USB-Loader & Wii Flow (don't use the other loaders).