Hello....

Sorry was busy with instaling and reinistalling and testing
I have another strange development here...
I can reproducible install it with the same media on the sae computer when i use a specific usb stick...
Its like only this USB stick is able to boot into the os without the error...
Is there anything that you guys could think of, that could cause the error on usb drive xyz and install in working state on usb abc?

tried 4 different drives now...

Thx again...

The live boot output i will post tomorrow

Went back and reread your posts, you say the usb will boot on the debian machine with out any problems, insert into another machine and it won't boot, is that correct? If, so what is model and specs of the machine the usb won't boot on?

That is correct...
Everu install to an USB drive on this machine with the same install media is able to boot on other computers...
Just not on this...where the install happened...
BESIDES the one USB stick i just used in my frantic try to get it done somehow...(about 20 installs so far tonight)
This USB stick is pretty slow and only 8 gig in size, but i can install again and again and it always boots...
Very disturbing...
Specs...:
It is a 6 bay Readynas Pro 6 with a E6700 CPU und 4 gig of DDR2 ram...
The internal 128 mb soldered USB datastore is not used anymore since the OS6 from Netgear only offers so much and only btrfs...
So the 6 bays are used for my RAID6 and the external USB drive in ment to be the boot/OS drive...
Mainboard is pretty simple Intel board

The usb's that don't work, have you tried them in all the usb ports on the nas?

How large are the other usb's that you tried? Are they similar to the one that works?

The usb's that don't work, they wouldn't happen to be 3.0 and the one that does work a 2.0?

Hello...

Yes, the main difference is USB2 and 3...none of the USB3 ones boots and gives me the error...
The USB 2 ones do boot...
Well done Watson...is there known issues with USB3 or just well educated guessing?
promise...tonight i get you the gparted -l output

I looked up the specs on the nas, the usb ports are 2.0, have seen something similar before.
No need for that now.

Do u actually see a way around it?
Or is it possible to have grub on the internal drive (128mb) and have it boot/read/write to the external drive?
Like a split setup...boot function here and os actually there?

Thx for your help and time

Sooooo....
I did an experiment...hope you can explain me the outcome...
Since i had now this USB stick that is booting...i was wondering if i could simply dd it to the USB3 one and have it boot...
And...guess what...it worked...why is that and why is direct install not working?
Is there any logic to the madness that you could think of?
Thx for any thoughts

I don't know either, unless it has something to do with file system block size.

Thx so much for your help in any way...
All here...u r awesome...
Since we are together in such a productive conversation...
Any good advice of an compressed backup of the last setup status when i am done configuring?
Like an dd with compression and only the blocks with actual data?

Thx!

I can't help you there, maybe some else will chime in, or start a new thread with that question.

Disk Dump (dd) does not do compression, it copies byte for byte, exactly what is on the disk for the amount specified. It is not designed for making backups. The old reliable backup utility is tar. It uses several versions of compression, as you choose.