New
#1
What does Disk Management show for the drive?
My guess is that you have a partition, with a lot of unallocated space after it.
One way to have gotten that could have been cloning a smaller drive to a larger one.
If there is no allocated partiton after the 400+GB one, you can use Disk Management to add the space into the formatted partition.
Run: DiskParInfo.bat - Click here to go to the BSOD batch repository to download and run this batch file.
Open disk management > by default some columns are compressed > widen each Status and Volume > make sure the contents within the parenthesis are in full view and that none of the characters are cutoff > view disk 0 > widen this row as needed so that all of the characters are in full view > post an image into the thread
Disk Management - How to Post a Screenshot of
Download and install Minitool Partition Wizard > click launch > post an image of the results into this thread
https://download.cnet.com/MiniTool-P...-10962200.html
MiniTool Portable Partition Magic Brings Easier Disk Management
When available please update the progress with the steps in post #3.