Get a sneak peek into the 11th EDMARK International Convention 2024! Experience the excitement and highlights of this grand event, happening on 23 October 2024 at the Grand Theater National, Dakar, Senegal. 🙌 Don’t miss out on this unforgettable celebration of success and camaraderie. Secure your tickets now through your marketing in-charge at the nearest EDMARK branch. Be part of this life-changing experience! See you there! #EDMARKIC2024 #IfNotUsWho #EDMARK4Life | Edmarkers (Official)

🇬🇧 CD-ROMs, DVDs and Blu-rays are coded in binary, 0 and 1, thanks to alternating of pits and bumps on a metalized or plastic surface. First, I separated the two plastic layers to access the metal part. Otherwise, it is impossible to focus under the microscope. Then I show the comparison between the size of a hair (diameter approx. 80µm = 0.08 mm) and the etching data on the DVD. The smallest pits are 0.4µm, i.e. 200x smaller than a hair. The data from the DVD is read on the surface of the dis