Abstract
Compact Discs (CDs) and Digital Versatile Discs (DVDs) are electro-optical devices, as opposed to nearly all other computer peripherals which are electromagnetic. There are no magnetic fields in the reading or recording of these discs, therefore, they are immune to magnetic fields of any strength, unlike hard drives. Due to its immunity to magnetic fields, CD and DVD media is unaffected by Electromagnetic Pulse (EMP) effects, X-rays, and other sources of electromagnetic radiation. The primary consideration with recordable CD media is energy transfer. It takes a significant amount of energy to affect the media that the writing laser transfers to the disc. DVD media consists of two half-thickness polycarbonate discs. DVD media has the information manufactured into the reflector and no dye layer is present. Rewritable DVD media uses bi-stable alloy layers similar to those for CD rewritable media. There are a number of distinct areas on the surface of a CD or DVD including spindle hole, clamping ring stacking ring, mirror band, beginning of data area, and end of data area, which is located slightly inside the outer edge of the disc. The information on discs is represented by pits and lands in manufactured discs.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
