Re: mkfs problem

[Pierre Frenkiel <pierre.frenkiel@gmail.com>]

On Sun, 10 Mar 2019, Pascal Hambourg wrote:

> Le 10/03/2019 à 17:01, Pierre Frenkiel a écrit :
> > hi,
> > 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
> >      works
>
> 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)