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Re: mkfs problem

On Sun, 10 Mar 2019, Pascal Hambourg wrote:

Le 10/03/2019 à 17:01, Pierre Frenkiel a écrit :
I'm trying to format a new USB flash drive and I get this:

==> mount | grep sdh

==> mkfs.vfat /dev/sdh1
     mkfs.fat 4.1 (2017-01-24)
     mkfs.vfat: /dev/sdh1 contains a mounted filesystem.

==> mkfs /dev/sdh1

You should not format (and more generally write directly to) a block device which contains a mounted filesystem.

  not only should not, but you can't ...
  as I said previously, the flash drive was not actually mounted
  (mtab not updated)