I am asked this question so many times that, I thought I would write this short article dedicated to settling this curiosity.
The C and D drives are generally two large partitions on the one hard drive. The D drive can be found on most laptops and desktops, put there by the manufacturer as a recovery drive. Each manufacturer has developed their own recovery software, because they don’t provide recovery disks when you buy a new computer anymore. So the recovery drive is there to protect your computer from losing everything, that way you can reset your computer back to factory settings if needed.
This is helpful if there are issues with your system files, or a major corruption on your computer that renders it so bad it is best to just start again. I have found there is seldom rhyme or reason as to how much space is allocated to the C drive and the D drive. I have seen C drives with just enough space to fit the system files and a D drive with more space than the Milky way.
If you find that there is no real issue with your space allocation on each, then I would suggest to leave well alone. But if you find that you are running out of space, or the computer starts bringing up a warning that you have low disk space, then I would suggest first try giving your computer a cleanout to free up some space.
To do this, firstly, go back through your digital closet and clean it out. Then perform a disk clean up. If you are running Windows 10, search for Disk Clean up from the taskbar and select it from the list results. Under Files to delete, select the file types to get rid of. Select OK. If you need to free up more space, you can also delete system files. In Disk clean up, select Clean up system files. Select the file types to get rid of. Select OK. Or you can download a free cleaner like Ccleaner and clean up some temporary program files from there.
If this still doesn’t do the trick, then you can change the partition sizes of your C and D drives through your Disk Management tool. This can be found within the control panel under administrative tools, but be warned! One wrong click and you may delete everything so steer clear if you are a novice. If it gets to that stage, I would suggest getting your technician to come over and move your partitions around and free up some space if needed.
I hope this helps clarify a curiosity, if you would like any more information or help regarding your computer you can always call me.