Thanks for your reply. I've updated my question where if I even tried remounting the drive with an admin user it fails as shown in the question. I've run dmesg journalctl and S.M.A.R.T and placed the results in this link dropbox.com/sh/bgw1rkbhj1vqrn0/AABGVaqh-LMoc8oAyVwqLwyIa?dl=‌​0 I'd appreciate it if you could check it out?

your mount comand should be "mount /dev/sdaN" where N is partition number , your drive / sata link gets stuck and bus reset times out , is this a virtual box ? then change from sata to ide link . also smartctl might fail when this is a usb disk

No it’s not a virtual box, and not a USB disk. Did you get the chance to check the link having the outputs of the commands you asked me?

i did look through your dmesg &screenshots .. it might be you have bad sectors or somehthing about the sata controller is wrong

I ran gnome-disks and here is the result dropbox.com/s/cjpo7c0ukaqbd3l/gnome-disks.png?dl=0. do you think it is a hardware issue with the disk or something from the OS?

( that is the start screen) , select the 8TB and either press S (seems standard hotkey for smart ) , or select it in the menu ( th three bars on top)

First, Thanks for trying to help me, I really appreciate it

dropbox.com/s/qg7n9bmvxmvwovt/gnome-disks-8TB.png?dl=0

Here I choose the 8TB on the gnome-disks

is your native language differet than english ?

Shall I press "Start Self-test"? when I press on it gives 3 options Short, Extended or Conveyance

you might

It is English

but this takes long

veeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeerry long

Oh okay

so what would you suggest me to do?

( at least the extended one that would check all blocks, but you could do that with badblocks )

forums.tomshardware.com/threads/seek-error-rate.676180

at least your pending/uncorrectable/reallocated sectors seem to be ok

Is that disk old? I see it has been powered on for more than 2 years?

( see head flying hours, thats the real use time )

( and more or less yes, it is 2 years )

if it is NOT a seagate , then you should be concerned about the ECC sector rate

Oh okay, this is strange as I sent it the machine to the supplier who said they replaced the disk but I feel they didn't

and the SEEK error rate is EXTREMELY high for a non-seagate hard disk , even for them

seek error comes from "disk misses right track" , e.g. due to vibrations or buld quality

do you have vital data stored on the disk ?

So would you suggest me buying a new 8TB seagate drive and copy the data over to it?

at least

disk*

there is a little problem

Yes, the data is important

you might have this disconnection Fckup during copying

oh okay

i fear the timeouts will come back and interrupt a normal copy/rsync ( thats what usually happens and you should avoid every operation that is unneccesary on that disk from now on )

so this means you are pretty sure it's a disk hardware related problem, right?

And it seems that the supplier didn't replace the drive 1 month ago, right?

disk or sata controller

the ssd is connected to the same controller ?

I am not sure, I can check

don't bother

recommendation: grab a mainboard /external enclosure which works FOR SURE

create a disk image with dd_rhelp ( reads from both sides of disk until it cannot read any more secotrs )

use testdisk on that diskimage and copy to secondary device

i know , expansive or "not easy"( you need minimum 2x8TB more if the disk is full )

according to the supplier they checked the harddrive on another machine and it's working fine.I really don't know what they did or even if they did anything actually.

if a secondary controller/mainboard lets you read without trouble , you might run testdisk directly on /dev/sda or something

I think I have an external disk reader which is connected using USB

it has no sector errors would be the "proper" description

yeah , be sure to go for usb3 , with 20M/s(usb2) it will waste your life

Okay

And I will probably buy a new 8TB seagate disk

any recommendations on which model I should get?

I see so many models

@Benjiover_9000'benchonaut' You can ping me with my username here when you add anything to the chat so I can get notified and check it.

@Tak

basically you should only beware of en.wikipedia.org/wiki/Shingled_magnetic_recording / helium drive

and if you don't actually do server/surveillance 24/7 actions your should be also okay with barracuda compute or similar devices, pro users might look into skyhawk/ironwolf/exos range

Wow dude, big up for using blender so excessively ;)

I can buy skyhawk/ironwolf/exos any of them is better than the other?

Thanks man, I used to use blender a lot, and I love it :)

@Benjiover_9000'benchonaut' New to linux though, so I appreciate your help, you are always welcome to let me know if anything related to blender and I can see if I can help :)

I will send the supplier and ask them to send a new drive since this is not new, right?

backup first (!)

@Benjiover_9000'benchonaut' You can ping me when you post something :)

ironwolf (pro) , since they have guarateed CMR (Conventional Magnetic Recording)

And could you advise me with what the mount command to put on fstab?

@Tak you want it to be mounted at boot time ?

Yes

So no need to partition it?

use gnome-disks ( the gear button below or in the menu ) , there is a "format disk" option , select GPT ( MBR is only useful until 2tb ) , alternative use sfdisk

basically there is no "MUST" for partiioning , but since most scripts are aligned to that you should go for that , also during a possible recovery it helps sometimes , because mostly partitions automatically are aligned to sector boundaries and a backed up partition table might come in handy when your first sectors fail ( this would be a superblock place without partition table )

Okay, shall I try these mounting options on this disk before buying a new one? or you are pretty sure this disk is faulty?

well , you shall try another controller , but since there is still data on it : don't , you might mount it read only , but as i said , the disconnects may return

What do you mean by "another controller"?

Also you are pretty sure it's not an OS issue, right?

and if u don't wanna bite ur own butt ("why didn't i..." ,"remodeling this and that file takes 2 weeks") , MAKE AN IMAGE BEFORE ( there are no larger letters than uppercase )

HAHAHA OKAY

an image of this disk only or the system disk as well?

only this one

okay, I will

when your system is on ssd: back it up to nas as well

i prefer restic,duplicity is damn slow

Okay, I used to use Clonezilla or macrium reflect, but they are kinda slow

but I can try restic

also you are pretty sure it's not an OS issue, right?

main problem is : ext4 is very linux specific and i guess you won't have much success with BSD or other systems , windows might have better controller drivers , but lacks ext4 ( you could make an image at least )

@Tak I've updated the answer ,maybe you could mark it as solved

( clonezilla is for full disk images )

@Benjiover_9000'benchonaut'I will check that in the next couple of days and let you know how it goes, and mark it as solved thank you so much

As I left the machine now and will have access to it next week, but I will keep you updated, I upvoted your answer though :)