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Create 4 MB (not GB) partition on memory card

I have a very old piece of equipment that requires a 4 MB (not GB) PCMCIA card. Those aren’t available any more. So I bought a PCMCIA adapter with a CF card. I am trying to create a 4 MB partition, in hopes that that will fool my old equipment.

When I go into Windows 11 Disk Management, it won’t allow me to create a volume of less than 8 MB. Is it possible to create an (unformatted) 4 MB partition somehow?