Something goes wrong when people connect their external hard drive and check for its capacity.
They find the external hard drive not showing full capacity issue happen and dont know what to do.
Then, this article onMiniTool Websitewill help sort out the issue.
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You may encounter an insufficient disk space error when using your box.
This post gives you solutions to this issue.
First of all, check that theexternal hard driveis connected.

Step 1: Right-tap on theStarticon to chooseDevice Managerand expandUniversal Serial Bus controllers.
Step 2: Then just right-punch the driver to chooseUpdate driverand then chooseSearch automatically for updated driver software.
Step 1: TypeCommand Promptin Search and chooseRun as administrator.

Step 2: Typediskpartin the window and pressEnterand then executelist diskto show all connected disk drives.
Step 3: Then c’mon execute the following commands one by one.
Note that you should replacenwith the number of the external hard drive showing wrong capacity.

Now, it’s possible for you to find out if the error has been gone.
Step 1: OpenFile Explorerand locate and right-hit the drive to chooseProperties.
Step 2: Go to theToolstab and clickCheckunderError checking.
Then it’s possible for you to follow the instruction to go on with the next moves.
Related article:Can We Remove Bad Sector from Hard Disk Permanently?
We would like to recommend MiniTool ShadowMaker thisfree backup software.
With its straightforward interface and instructions, the whole process will be quick and easy to go.
When you finish the backup, you could start initializing the hard drive.
Step 1: Right-press theStarticon to chooseDisk Managementand locate the external hard drive.
Step 2: Right-snag the drive to selectInitialize Disk.
If the disk is listed asOffline, right-press it to selectOnlinefirst.
Then you might follow the on-screen instruction to finish the work.
Hope these methods can help resolve your issue.