On Sun, 24 May 2020, Robert Heller wrote: > At Sun, 24 May 2020 18:33:25 -0500 (CDT) CentOS mailing list <centos at centos.org> wrote: > >> >> 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 > > First of all, doing it *without* a partition table is not going to work (well > mkfs.fat is not going to care (once you deal with the other error). Since Thanks much! That was it. It did care. At one point I was even told something like, won't do it, partition table. > you are formatting iy FAT32, I'm presuming you will be using it in some device > (eg camera, mess-windows machine, etc.). You want an MBR partition table -- Actually, I'm trying to update my BIOS. The instructions I found require FAT32. https://h30434.www3.hp.com/t5/Desktop-Hardware-and-Upgrade-Questions/Trying-to-update-the-bios-on-dc-5800-mt/m-p/5746185#M134271 >> 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. > > I'm guessing you are using a GUI and the GUI has some "magic" GUI mounter hack > that automagically mounts USB disks when they show up. You probably have to > turn that off or work around it. I guess umount from a shell will work. Eject I used eject from the GUI and umount from the command line. > won't work, since that not only umounts the file system, it also removes the > device files (hense "device not found"). -- 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