my file explorer (caja on Ubuntu Mate 18.04) is suddenly showing 2 mounted devices filesystem and efi. My hard drive is not mounting now. What might be the problem?

Screenshot. Please look in the left pane for external mounted devices


There only possibility I can think of is that a recent update caused the appearance of drives/partitions on your pc. On my pc filesystem is merely a shortcut to your root folder.efi means Extensible Firmware Interface system partition or ESP is a partition on a data storage device (usually a hard disk drive or solid-state drive) that is used by computers adhering to the Unified Extensible Firmware Interface (UEFI).

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