In modern Windows PCs, the C drive has the main designation ofLocal Diskalongside the C lettering.
Why Is It Called the C Drive?
What Is the Difference Between C and D Drives?

The Local Disk (C:) highlighted in the Windows file explorer. The Windows icon on the icon of the drive indicates it’s the boot drive.
The C drive is the main partition for your Windows computer.
The D drive will be a secondary hard drive, SSD, or partition of a drive.
How Do I Find the C Drive On My Computer?
you might find the C drive from within the Windows file explorer by navigating toThis PC.
On older versions of Windows, you want to look forMy Computerinstead.
What Can I Safely Delete From My C Drive?
you could also usedisk cleanup applicationsto automate the process for you.
You may be able to move your files just by changing their locations in Properties.
Right-poke the folder to move (Documents, Music, Photos, etc.
), and then selectProperties.
In theLocationfield, change the entry toD:\ [name of folder], and then clickApplyandOK.
Make the D drive the target, and your machine should move the folder over.