[TriLUG] Is all hope lost (Ubuntu 18.04)

[Mauricio Tavares via TriLUG]

On Sun, Nov 29, 2020 at 6:12 AM Joseph Mack NA3T via TriLUG
<trilug at trilug.org> wrote:
>
> On Sat, 28 Nov 2020, Brian via TriLUG wrote:
>
> > All *may* not be lost; any files that were on sda before are still
> > there, but good luck finding them again without a correct partition table.
> .
> .
> > If you changed the partition table on sda, the previous partition table
> > is gone.  If you happen to know where the previous partitions start and
> > end on the disk, you can rebuild the partition table to what it was before.
> >
> > The data in the files is probably safe, if you didn't attempt to write
> > to the newly-defined partitions.
>
> I don't know why you got "unknown filesystem".
>
> However if you've just erased the partition table, the original partitions
> are still there and you can mount them even if you don't know where they
> start and end.
>
> but first ... don't do any write operations on your scrambled disk. Make a
> dd copy of it and try to rescue the copy.
>
> to mount a partition when you don't know where it is, you just try to
> mount every block in the disk. Here's my script for it. (It doesn't do any
> writes.)
>
> Joe
>
> --
>
> #! /bin/bash
>
>
> #-----
>
> # see pario.no/2009/01/19/mount-a-disk-image/
>
> img=DB59303.img
> mnt_point=mnt3
>
> random_mount(){
>         #change vfat to your expected filesystem (or leave out the "-t vfat")
>          mount -o loop,offset=$(($offset*512)) -t vfat $img  /$mnt_point > /dev/null 2>&1
>          if [ "$?" = "0" ]
>          then
>                  echo "found it $offset"
>                  exit
>          fi
> } # random_mount
>
> for ((offset=0; $offset < 200000; offset=$offset + 1))
> do
>          echo $offset
>          random_mount
> done
>
> # random_offset_mount.sh --------------------------
>
> --
> Joseph Mack NA3T EME(B,D), FM05lw North Carolina
> jmack (at) trilug (dot) org - azimuthal equidistant
> map generator at http://www.wm7d.net/azproj.shtml
> Homepage http://www.austintek.com/ It's GNU/Linux!
>
      I would also suggest, by the undying love of the Alien Queen
Mother, to get a second, larger disk, and copy the original drive into
a disk image in it and then go play in the disk image.