I can't format my D drive.

Solution
Using an Admin account (or an account with Admin rights) - Go to Control Panel ---> Administrative Tools ---> Computer Management - Disk Management.

You will now see all the drives connected to the computer. Select the drive that you want to format. Format it NTFS. Make sure that you select the correct drive. Formatting will delete all data.
Using an Admin account (or an account with Admin rights) - Go to Control Panel ---> Administrative Tools ---> Computer Management - Disk Management.

You will now see all the drives connected to the computer. Select the drive that you want to format. Format it NTFS. Make sure that you select the correct drive. Formatting will delete all data.
 
Solution


If I try to change the letters it just says "Parameter is incorrect"
 


It is greyed out.
 

How many physical hard disks do you have in this computer? Is the "D" drive a separate hard disk?
 

Nope. It is a partition.