<<$ sudo dd if=/dev/sda1 count=2048 2>/dev/null | hexdump -C>>
https://pastebin.com/ReEvXhK4
This is very curious... I'm now wondering if it wasn't a full 1M wipe.
But instead something more like
# dd if=/dev/zero of=/dev/md3 bs=446 count=1
or maybe the Synology Nas tried to restore some of the boot sector
when it I tried to do the repair on it?
Regardless; I just booted the NAS and did a quick 'history' to see if
it would find the real command. Of course because /dev/md3 is gone...
there's no history for my user account.
On a whim; I did the same command for the "Safe" 4TB drive that didn't
receive the wipe. Not sure if it's of any value but here it is:
https://pastebin.com/hrHwkHyk