Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.debian.user > #208266

Re: Trouble making bootable USB from ISO image

Show all headers | View raw

On Sat, May 04, 2019 at 09:54:52AM -0000, Curt wrote:
> I'm intervening here merely to point out that just because the user's
> external usb device is auto-mounted does not mean that said device
> cannot be unmounted by the usual methods (at least I have yet to
> encounter Greg Wooledge's auto-mounter from Hell that will not permit
> it). 

I never said anything about not being able to unmount.

If a partition from a medium (USB or whatever) is mounted read-write,
during the time that you execute a "cp foo.iso /dev/sdx" command
to write a disk image to said medium, you are going to have problems
of the corruption kind, not of the "cannot unmount it" kind.

Unmounting the file system is going to write some information to the
medium in the place where the operating system thinks the file system
is.  But that file system isn't there any more, because your cp (or dd
or whatever) command overwrote it.  But the file system driver, upon
unmounting the file system, is supposed to write stuff -- flushing
the cache, setting the "this has been cleanly unmounted" flags, etc.
All of that stuff that it writes will corrupt whatever part of the ISO
image it happens to land on.

Back to linux.debian.user | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: Trouble making bootable USB from ISO image Greg Wooledge <wooledg@eeg.ccf.org> - 2019-05-03 19:00 +0200
  Re: Trouble making bootable USB from ISO image Paul Sutton <zleap@disroot.org> - 2019-05-03 19:30 +0200
    Re: Trouble making bootable USB from ISO image john doe <johndoe65534@mail.com> - 2019-05-03 19:40 +0200
  Re: Trouble making bootable USB from ISO image James Medeiros <james.medeiros@gmail.com> - 2019-05-03 19:30 +0200
  Re: Trouble making bootable USB from ISO image Mark Fletcher <mark27q1@gmail.com> - 2019-05-04 04:50 +0200
    Re: Trouble making bootable USB from ISO image "Russell L. Harris" <rlharris@oplink.net> - 2019-05-04 07:30 +0200
      RESOLVED: Trouble making bootable USB from ISO image Mark Fletcher <mark27q1@gmail.com> - 2019-05-05 05:30 +0200
    Re: Trouble making bootable USB from ISO image "Thomas Schmitt" <scdbackup@gmx.net> - 2019-05-04 08:40 +0200
      Re: Trouble making bootable USB from ISO image deloptes <deloptes@gmail.com> - 2019-05-04 09:20 +0200
        Re: Trouble making bootable USB from ISO image "Thomas Schmitt" <scdbackup@gmx.net> - 2019-05-04 09:30 +0200
          Re: Trouble making bootable USB from ISO image deloptes <deloptes@gmail.com> - 2019-05-04 11:30 +0200
            Re: Trouble making bootable USB from ISO image "Thomas Schmitt" <scdbackup@gmx.net> - 2019-05-04 11:50 +0200
            Re: Trouble making bootable USB from ISO image Pascal Hambourg <pascal@plouf.fr.eu.org> - 2019-05-04 14:40 +0200
        Re: Trouble making bootable USB from ISO image Nicolas George <george@nsup.org> - 2019-05-04 10:20 +0200
          Re: Trouble making bootable USB from ISO image deloptes <deloptes@gmail.com> - 2019-05-04 18:50 +0200
            Re: Trouble making bootable USB from ISO image Joe <joe@jretrading.com> - 2019-05-04 21:30 +0200
            Re: Trouble making bootable USB from ISO image Pascal Hambourg <pascal@plouf.fr.eu.org> - 2019-05-05 11:00 +0200
    Re: Trouble making bootable USB from ISO image Curt <curty@free.fr> - 2019-05-04 12:00 +0200
      Re: Trouble making bootable USB from ISO image Greg Wooledge <wooledg@eeg.ccf.org> - 2019-05-06 14:50 +0200
        Re: Trouble making bootable USB from ISO image Curt <curty@free.fr> - 2019-05-06 16:10 +0200

csiph-web