Cannot mount Harddisk for Backup

I’ve an Icy Box with 2 harddisks, formatted with ext4, that are visible with fdisk -l. How can I make them appear under “Storage Management”? Any tips?

fdisk:

Disk /dev/sda: 9.1 TiB, 10000831348736 bytes, 19532873728 sectors
Disk model: N0008-2JJ101
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 4096 bytes / 33553920 bytes

Disk /dev/sdb: 9.1 TiB, 10000831348736 bytes, 19532873728 sectors
Disk model: N0008-2JJ101
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 4096 bytes / 33553920 bytes

The one drive that worked before, for backup, has some more infos in fdisk output (Disklabel type and Disk identifier), the nextbox internal hd also has these two:

Disk /dev/sda: 9.1 TiB, 10000831348736 bytes, 19532873728 sectors
Disk model: 0EFAX-68LHPN0
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 8D3D24B5-5AEB-411A-9E35-3CFEC3006AE3

it looks like it does not have a partition table and you just raw formated the block device, this often still works but maybe not in this case. Maybe this links help in formatting your disks How to Create Partitions in Linux {Using parted and fdisk Commands}

Thank you. I formatted them with Ubuntu’s builtin “Disks” tool. Let’s see what fdisk and friends can do - I dont normally dare using it :wink:

Final report…it showed that there was no partition table, as @nesti pointed out! The Ubuntu “Disks” application just did not create one. It then worked in Ubuntu nonetheless, which caused the confusion. With sudo parted -l it showed a partition table of type loop…I ended up with this simple solution: sudo gdisk /dev/sda/, and then typing w (dont “just do this”! :wink: - found here: partitioning - How can I change a drive's partition table from MBR to gpt without losing an NTFS partition at the end of the drive? - Ask Ubuntu

also, more on Ubuntu and it’s disks tool: partitioning - What is the "Loop" partition in ubuntu? - Ask Ubuntu

Backup DONE :slight_smile: