I bought an XPS 15 9550 laptop in October 2015, with a 500GB SSD C: drive. I need to upgrade that 500GB SSD to a 1TB SSD, but I'm concerned about compatibility with the BIOS, etc. Can you tell me if Dell sells a compatible 1TB SSD drive or if I can find one at Amazon? If you know of a source of detailed instructions for the physical upgrade and for moving the OS and contents of the C: drive to the new SSD, that would be greatly appreciated. With SSD prices appearing to be falling, this sort of thing should be occurring more frequently. Thanks in advance for your help.
The system uses an M.2 PCIe SSD - any will work. In order to clone your system, you're either going to need an external hard drive (to hold an image of the drive) or some kind of USB to M.2 adapter so you can connect both drives to the system at the same time. Be sure you turn OFF secure boot in setup (F2 at powerup) before making an image or cloning the drive.