Mkfs.fat Device Or Resource Busy

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I’m trying to format a 16 GB SD card to FAT32. Either it won’t find the device or it gives me the titular error message.

mkfs.fat /dev/sdc

I have tried “ejecting” the drive and reinserting the card. I have tried inserting another card, checking to insure that I could see its file, ejecting that card and inserting the target card. If I do not umount it, busy, if I don’t, not found.

What is the incantation for formatting an SD card.

BTW I am using CentOS 7 and a USB adapter.

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