xcopy c:\ d:\ /h/i/c/k/e/r/y

Use the above command. It will definitely work.

In this command data will be copied from c:\ to D:\, even folders and system files as well. Here’s what the flags do:

• /h copies hidden and system files also
• /i if destination does not exist and copying more than one file, assume that destination must be a directory
• /c continue copying even if error occurs
• /k copies attributes
• /e copies directories and subdirectories, including empty ones
• /r overwrites read-only files
• /y suppress prompting to confirm whether you want to overwrite a file

You can see a list of flags by running xcopy /?.