Inspiron 15 5000 P75F - How to change or upgrade the hard disk

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APPROACH WITH CARE AND CAUTION. Don't break your computer! And don't blame me if you do. If in doubt, go to a professional.
If you have a version of this laptop with a DVD drive you must be aware that an additional screw (or more than one?) on the underside cover needs removing and you can then slide out the DVD drive!

How to open up and replace or upgrade the hard disk on a Dell Inspiron 15 5000 Series (P75F / P75F001 / 2GM9M A01) laptop.

The procedure takes at least 15 minutes, probably longer if you are new to opening up computers. This video shows you how to remove the lower case to access the hard disk, RAM, Wifi Card (Wireless card), BIOS battery and SSD (M.2 NGFF).