Thanks for informing.
Actually, the vast majority of desktop PCs and laptops I see at tech stores are equipped with 1 or 2 optical disc drives, 5-10 years ago sometimes even 3 built in.
Some desktop PCs I saw had two slim drives instead of one desktop drive.
Laptop drives are,due to restricted speed, more noise at equal speed, and less insertion comfort, technically inferior (except (for) error correction, where they (BU20N and SE208DB) even occasionally beat the desktop drives (e.g. WM SH-S182,BE14NU40) I have at home) but also save power. Only 60% of power consumption at same rotation speed.
I wonder, why the 12.7mm is not any faster than ×24/×8/×6 (CD/DVD/BD). What is the advantage of 12.7mm then? .