Difference in Hard Drives in the new ones

[brucefl]

I have been looking over upgrading my whole computer. It gets more complicated when they change names or types of things. A HD used to be an HD, looking at an Omen that has memory of WD Black 512 GB PCIe® NVMe™ M.2 SSD (more or Less) Is there a big difference between this and sata?  Also why does not any of the HP's come with DVD writers anymore, except one inexpensive one. I am assuming though I can take my two out and put them in the 2nd, 3rd or 4th empty slot? Thanks Bruce

[Hydemus]

HDD is an old technology...

SSD PCIe NVME is the newer technology....

Of course they are different... But, their function is still the same,, as a storage device... Their different comes in different shape, different port, and different speed...

DVD or CD is rarely use anymore... So,, the expensive ones often doesnt have this feature... I think because the expensive ones laptop need to be as slim as possible... And we are moving to USB-C era,, so USB port is more usable than DVD/CD....