<div dir="ltr"><div>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?</div><div><br></div><div>Brent<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, 14 Jul 2021 at 09:51, Paul Nijjar via kwlug-disc <<a href="mailto:kwlug-disc@kwlug.org">kwlug-disc@kwlug.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
My advice is simpler: use one of the graphical frontends to make the<br>
ISO. My guess is that k3b would be a good choice, but I am not sure. <br>
<br>
I do not know that you need isohybrid. From what I remember all you<br>
need is isolinux, as documented here: <br>
<br>
<a href="https://wiki.syslinux.org/wiki/index.php?title=ISOLINUX" rel="noreferrer" target="_blank">https://wiki.syslinux.org/wiki/index.php?title=ISOLINUX</a><br>
<br>
What operating system does your USB boot to? It sounds as if it is<br>
some form of DOS? Is it FreeDOS?<br>
<br>
- Paul<br>
<br>
On Wed, Jul 14, 2021 at 08:47:22AM -0400, Chris Frey wrote:<br>
> To be absolutely sure you have the same image as a backup,<br>
> Cranky is correct about 'dd', and you likely want the whole device,<br>
> not just a partition. Then just burn the file to a DVD. This is the<br>
> easiest and most certain way to make a backup. That way you know you<br>
> can just revert the USB quickly in case of disaster.<br>
> <br>
> If you're lucky, the USB stick might have partitions (/dev/sdb1, etc),<br>
> and one of them might be formatted as an isohybrid. In that case,<br>
> you may be able to peel /dev/sdb1 off the USB and burn the result<br>
> as the ISO. I haven't burned CD/DVDs in a while, so I don't know<br>
> if this is will work.<br>
> <br>
> Some interesting links I found while poking at this problem:<br>
> <br>
> <a href="https://unix.stackexchange.com/questions/403463/how-to-make-a-bootable-iso-file" rel="noreferrer" target="_blank">https://unix.stackexchange.com/questions/403463/how-to-make-a-bootable-iso-file</a><br>
> <a href="https://wiki.syslinux.org/wiki/index.php?title=Isohybrid" rel="noreferrer" target="_blank">https://wiki.syslinux.org/wiki/index.php?title=Isohybrid</a><br>
> <a href="https://en.wikipedia.org/wiki/ISO_9660" rel="noreferrer" target="_blank">https://en.wikipedia.org/wiki/ISO_9660</a><br>
> <br>
> - Chris<br>
> <br>
> <br>
> On Wed, Jul 14, 2021 at 08:21:54AM -0400, CrankyOldBugger wrote:<br>
> > I was going to say that "dd" is your best bet, but to be honest I've never<br>
> > done this in Linux with a CD, so caveat emptor, you should read up on "dd"<br>
> > before you start. You'll need to read up on the command line parameters as<br>
> > well.<br>
> > <br>
> > I do use "dd" to copy ISOs to USB, or ISOs to SD cards all the time, so I<br>
> > know it works well there. But I've never used it with CDs.<br>
> > <br>
> > <br>
> > On Tue, 13 Jul 2021 at 21:47, John Driezen <<a href="mailto:jdriezen@sympatico.ca" target="_blank">jdriezen@sympatico.ca</a>> wrote:<br>
> > <br>
> > > I recently purchased the latest version of Eurosoft's PC Check. The<br>
> > > software came on two 8 GB USB thumb drives. I would like to know how to<br>
> > > back the contents of the thumb drives up, preferably to a bootable<br>
> > > CDROM, which I can not accidently overwrite, as PC Check contains<br>
> > > options to destructively erase hard drives.<br>
> > ><br>
> > > The output of df -hT shows this:<br>
> > ><br>
> > > Filesystem Type Size Used Avail Use% Mounted on<br>
> > > /dev/sdh1 vfat 6.5G 63M 6.5G 1% /media/john/EUROSOFT<br>
> > ><br>
> > > As you can see, the thumb drive is mostly blank and the files will<br>
> > > easily fit on a CDR. PC Check boots to EURODOS, and runs PC Check from<br>
> > > there.<br>
> > ><br>
> > > I know I can use mkisofs to create an iso file containing all the files<br>
> > > from the mountpoint /media/john/EUROSOFT, and then write that iso file<br>
> > > to a CDR or DVD-R. How can I make said CDR or DVD-R bootable? I did<br>
> > > read the man page for mkisofs, but find all the options confusing.<br>
> > ><br>
> > > John Driezen<br>
> > ><br>
> > > <a href="mailto:jdriezen@sympatico.ca" target="_blank">jdriezen@sympatico.ca</a><br>
> > ><br>
> > ><br>
> > > _______________________________________________<br>
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</blockquote></div>