I run MacOS Sierra 10.12.4 and struggling with my external 3.5 Data HDD not mounting after a short circuit in the Hard disk casing. I have purchased a new casing and have seen that the volume / partition still exists, but it is not mounting to the Mac. I had used Disk Drill data recovery and I can see that the partition exists and the data can be recovered.
The problem is:
I am unable to mount the HDD using disk utility as the mount is greyed out. I can see two volumes / partitions but the mount option inside each of them doesn't work.
I am not even able to erase the partitions or the disk. It gives the error shown on the screen - "Mediakit reports not enough space on device for requested operation."