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....
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