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External HDD appears in terminal but can't be m...

I have a MacBook Air (2013), running Sierra (10.12.6). External hard drive got ejected improperly by accident and since then finder will not recognize the hard drive. Hard drive does have power when plugged in.

In terminal, diskutil list shows the drive listed as part of /dev/disk2 (external, physical):

0: GUID_partition_scheme disk2

1: EFI EFI disk 2s1

2: Apple_HFS LaptopBkp & Movies disk2s2

Disk 2s2 is the name I recognize as my old friend, the backup drive. Some attempted commands and the messages they yield:

diskutil mount /dev/disk2s2  --> "Volume on disk2s2 timed out waiting to mount"

diskutil unmount /dev/disk2s2 --> "Disk2s2 was already unmounted"

So, I'm hoping to be able to remount or even reformat this drive to get it working again. Any help appreciated.

最后更新：2017-10-12 11:30:29

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