unable to mount hard drive / single device looks like 2 separate devices

[Xelor]

Hello guys,

i'm facing with some strange behavior of my HDD.

This is a single 3TB disk but looks like 2 separate drives on my computers (tryed on manjaro and via armbian -- the same result):

$ lsblk | grep sd
sdb 8:16 0 2T 0 disk
sdc 8:32 0 746.5G 0 disk

Looks like that one of that separate drives has partition:

$ sudo fdisk -l | grep /dev
Disk /dev/sdb: 2 TiB, 2199023255040 bytes, 4294967295 sectors
/dev/sdb1 1 4294967295 4294967295 2T ee GPT
Disk /dev/sdc: 746.5 GiB, 801569726464 bytes, 1565565872 sectors

But:

$ sudo mount /dev/sdb1 /tmp/1
mount: /tmp/1: special device /dev/sdb1 does not exist.



And i can't mount "drives" too:

$ sudo mount /dev/sdc /tmp/1
mount: /tmp/1: wrong fs type, bad option, bad superblock on /dev/sdc, missing codepage or helper program, or other error.

$ sudo mount /dev/sdb /tmp/1
mount: /tmp/1: wrong fs type, bad option, bad superblock on /dev/sdb, missing codepage or helper program, or other error.

I'm not sure but it can be btrfs formated volume, but i can't check.

I wan to mount it somehow and read data.
Thanks for any advices on it.

 

[wizardfromoz]

G'day @Xelor - and welcome to linux.org

GParted will show you if the drive/s are in btrfs, do you have it?

Wizard

 

[Xelor]

G'day @Xelor - and welcome to linux.org

GParted will show you if the drive/s are in btrfs, do you have it?

Wizard

Thank you, Wizard
Unfortunately gparted doesn't show the fs:

Spoiler: screenshots

But it seems that i need to restore gpt header somehow...

 

[wizardfromoz]

Unfortunately gparted doesn't show the fs:

No that's good, there is a saying sort of like"Once we eliminate the impossible, we are left with the possible, and then the probable".

The screenshots are exactly what I would have asked for, thanks

Take a look at these articles, and notice the reference to 746GB such as you had here

$ sudo fdisk -l | grep /dev
Disk /dev/sdb: 2 TiB, 2199023255040 bytes, 4294967295 sectors
/dev/sdb1 1 4294967295 4294967295 2T ee GPT
Disk /dev/sdc: 746.5 GiB, 801569726464 bytes, 1565565872 sectors

https://askubuntu.com/questions/151...t-guid-shows-wrong-size-in-ubuntu-12-04-64bit

and

https://www.linuxquestions.org/ques...ss-gpt-disk-through-usb-interface-4175536219/

Also, gdisk is better for large drives, so

sudo gdisk -l /dev/sdb

#and

sudo gdisk -l /dev/sdc

... may reveal something extra.

So in all likelihood, the disk was formatted under Windows, perhaps you have it in a caddy of sorts that does not fully support GPT?

See what you think, and I will be in and out during my day.

BTW the line

/dev/sdb1 1 4294967295 4294967295 2T ee GPT

... my highlighting - I think indicates something like when we used to use hand-held calculators and asked them multiply figues that went beyond their capacity to report in full, and they would include an e (for exponential) and another figure to try to represent the result.

I'll be in and out during my day

Cheers

Wizard