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I assume you have tried running the "new simple volume wizard" by right clicking on the Unallocated, not initialised window in disk management.
Initially run a SMART test to check the disk hasn't developed a hardware fault, download and run crystaldiskinfo from here to test the disk
Crystaldiskinfo
If the disk hardware is OK I would use diskpart to try to initialise and clean the disk:
open an Administrative command prompt or powershell prompt
type the following
diskpart
list disk
This will list all the hard drives in the system with a number
type "select disk x", where x is the disk number that you want to clean.
Make absolutely certain you have selected the correct disk. If you have selected a drive which contains data or the operating system that you want to keep and you proceed beyond this point, that data/OS will be erased.
At the diskpart prompt, type "clean" and hit Enter. You will not be given a chance to opt out. Once you hit Enter, the disk will be erased.
You can now type exit and you should be able to initialise the drive in disk management, by right clicking and start the new simple volume wizard |
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