Formatting a 4TB SSD for Mini Pro

I have been trying to get our new (first time) Mini Pro to record to a 4TB SSD drive with no success. The Windows format utility does not go down to a 128k size, so I have been trying to use the command line to do it - still no success.
This is the command I have been using:
FORMAT H: /FS:exFAT /A:128K /V:Samsung_4TB /Q
It formats but the size keeps coming out as 256k and the Mini Pro wants 128...frustrating...
I formatted a thumb drive to exFat 128K and it recorded nicely. Just not sure if a 32GB thumb drive will hold as much as we are needing (1.5 hour meeting)
How do you format to 128K?
Help!!
This is the command I have been using:
FORMAT H: /FS:exFAT /A:128K /V:Samsung_4TB /Q
It formats but the size keeps coming out as 256k and the Mini Pro wants 128...frustrating...
I formatted a thumb drive to exFat 128K and it recorded nicely. Just not sure if a 32GB thumb drive will hold as much as we are needing (1.5 hour meeting)
How do you format to 128K?
Help!!