External drive won't be displayed in File Manager

[bisherbas]

Running 17.2 64-bit cinnamon.

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NAME   FSTYPE   SIZE MOUNTPOINT LABEL
sda           238.5G            
├─sda1 vfat     100M /boot/efi  SYSTEM
└─sda4 ext4   238.4G /          LINUX
sdb           465.7G            
├─sdb1 vfat     100M            SYSTEM
└─sdb4 ext4   238.4G            LINUX

I can see that the external drive is connected but somehow it is not visible in the file manager. External drive is the backup drive used for system cloning via Clonezilla. Your help is greatly appreciated. Thank you.

[Laurent85]

Nemo file manager -> Go -> Computer
No drive / volume displayed there ?

[Cosmo.]

I wonder, if it is a coincidence or a wrong output:
Although both drives show with a different size, the 2 partitions are in all respects (except mount point of course) absolutely identical.

Is sdb a clone of sda?

What shows

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sudo blkid -o list

[bisherbas]

I wonder, if it is a coincidence or a wrong output:
Although both drives show with a different size, the 2 partitions are in all respects (except mount point of course) absolutely identical.

Is sdb a clone of sda?

What shows

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sudo blkid -o list

Yes it is a clone of sda. Is that a legit reason not to show it in file explorer?

[Cosmo.]

Cloning a partition can confuse Linux, as during booting it identifies partitions usually by their UUID; the crucial part of these letters means "unique", but cloned partitions have the same UUID as the original one.

To solve this launch the live system, open gparted and mark every clone one after the other and choose from the right click menu New UUID.

[bisherbas]

Cloning a partition can confuse Linux, as during booting it identifies partitions usually by their UUID; the crucial part of these letters means "unique", but cloned partitions have the same UUID as the original one.

To solve this launch the live system, open gparted and mark every clone one after the other and choose from the right click menu New UUID.

Thank you for the help. I will do as you suggest once I am home.