On 07/14/2017 04:22 AM, Patrick Dupre wrote:
I just changed the size of the
first partition and I added a ext4 partition.

Did you unmount the drive before doing these changes? gparted won't let you modify a partition that is mounted. You say you changed the size of the first partition, was there more than 1?

Thus, I try to read the key from another computer and gparted did not
like (fdisk was giving wrong partitions). Thus, I had to entirely
repartition the stick.

Were you using gparted or fdisk or both? So the USB drive had a mangled partition table as well? That would be 4 drives messed up then.

Anyway, I started to investigate the issues with the PC which could
not boot. And I arrived at the point that the partition tables of the
3 HD were mess up.

I could kind of understand one disk getting messed up if you picked the wrong disk, but I have no idea how all of them would be.

Now, I am making the link.
Can this stick have a virus which may have mess up the partition tables.

Extremely unlikely since you didn't actually run anything from it.

Please, note that one of the HD probably still had a XP OS bootable.
I did not use it for a very long time.

That should not be relevant other than you should see a FAT32 partition in the table.

This has been a very long email thread, so I might have dropped some info, but are you using a live image right now for investigating this? Have you tried looking at these hard drives using a different computer?

I would recommend that you try a program called "gpart" to try to find the partitions. If the first try doesn't come up with a working layout, you can add the "-f" parameter to make it do a full scan of the disk instead of skipping when it thinks it found a valid filesystem.
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