External Hard Disk not showing in My computer or TExternal hard disk not showing in this PC? External hard disk not showing in My Computer? This video shows 4 possible reasons as well as solutions to help you address this issue.
Case 1. The hard drive is not initialized
If Disk Management shows the disk as "unknown/not initialized" and pops up a window asking you to initialize it, this new drive really needs initialization before you can use it. Then, you will have to create new partitions on it to make the hard drive appear on computer.
Case 2. The hard drive has no drive letter
External hard drive not showing up also occurs when the partition on the external hard drive has no drive letter.
Case 3. Hard drive becomes uallocated
In this case, you can try using MiniTool Partition Wizard to recover the unallocated space as well as its data.
Case 4. Hard drive has Unsupported or RAW file system
If the external hard drive has unsupported files system or hard disk become RAW, the partition bar won't show up in Windows File Explorer. You can only see the drive icon and drive letter there.
In this case, you need to do the following 2 things.
one, recover lost data from hard drive.
two, format the hard drive.