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. -- Michael hennebry at web.cs.ndsu.NoDak.edu "Sorry but your password must contain an uppercase letter, a number, a haiku, a gang sign, a heiroglyph, and the blood of a virgin." -- someeecards