[kwlug-disc] Backup a USB Flash Drive to DVD.

[R. Brent Clements]

One thing I have wondered about dd--can you easily restore the image onto a
medium with different characteristics?  i.e. a differently sized USB stick?

Brent

On Wed, 14 Jul 2021 at 09:51, Paul Nijjar via kwlug-disc <
kwlug-disc at kwlug.org> wrote:

>
> My advice is simpler: use one of the graphical frontends to make the
> ISO. My guess is that k3b would be a good choice, but I am not sure.
>
> I do not know that you need isohybrid. From what I remember all you
> need is isolinux, as documented here:
>
> https://wiki.syslinux.org/wiki/index.php?title=ISOLINUX
>
> What operating system does your USB boot to? It sounds as if it is
> some form of DOS? Is it FreeDOS?
>
> - Paul
>
> On Wed, Jul 14, 2021 at 08:47:22AM -0400, Chris Frey wrote:
> > To be absolutely sure you have the same image as a backup,
> > Cranky is correct about 'dd', and you likely want the whole device,
> > not just a partition.  Then just burn the file to a DVD.  This is the
> > easiest and most certain way to make a backup.   That way you know you
> > can just revert the USB quickly in case of disaster.
> >
> > If you're lucky, the USB stick might have partitions (/dev/sdb1, etc),
> > and one of them might be formatted as an isohybrid.  In that case,
> > you may be able to peel /dev/sdb1 off the USB and burn the result
> > as the ISO.  I haven't burned CD/DVDs in a while, so I don't know
> > if this is will work.
> >
> > Some interesting links I found while poking at this problem:
> >
> >
> https://unix.stackexchange.com/questions/403463/how-to-make-a-bootable-iso-file
> >       https://wiki.syslinux.org/wiki/index.php?title=Isohybrid
> >       https://en.wikipedia.org/wiki/ISO_9660
> >
> > - Chris
> >
> >
> > On Wed, Jul 14, 2021 at 08:21:54AM -0400, CrankyOldBugger wrote:
> > > I was going to say that "dd" is your best bet, but to be honest I've
> never
> > > done this in Linux with a CD, so caveat emptor, you should read up on
> "dd"
> > > before you start.  You'll need to read up on the command line
> parameters as
> > > well.
> > >
> > > I do use "dd" to copy ISOs to USB, or ISOs to SD cards all the time,
> so I
> > > know it works well there.  But I've never used it with CDs.
> > >
> > >
> > > On Tue, 13 Jul 2021 at 21:47, John Driezen <jdriezen at sympatico.ca>
> wrote:
> > >
> > > > I recently purchased the latest version of Eurosoft's PC Check. The
> > > > software came on two 8 GB USB thumb drives.  I would like to know
> how to
> > > > back the contents of the thumb drives up, preferably to a bootable
> > > > CDROM, which I can not accidently overwrite, as PC Check contains
> > > > options to destructively erase hard drives.
> > > >
> > > > The output of df -hT shows this:
> > > >
> > > > Filesystem     Type      Size  Used Avail Use% Mounted on
> > > > /dev/sdh1      vfat      6.5G   63M  6.5G   1% /media/john/EUROSOFT
> > > >
> > > > As you can see, the thumb drive is mostly blank and the files will
> > > > easily fit on a CDR.  PC Check boots to EURODOS, and runs PC Check
> from
> > > > there.
> > > >
> > > > I know I can use mkisofs to create an iso file containing all the
> files
> > > > from the mountpoint /media/john/EUROSOFT, and then write that iso
> file
> > > > to a CDR or DVD-R.  How can I make said CDR or DVD-R bootable?  I did
> > > > read the man page for mkisofs, but find all the options confusing.
> > > >
> > > > John Driezen
> > > >
> > > > jdriezen at sympatico.ca
> > > >
> > > >
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