what is the difference between a store bought movie disc and one you make at home? what is the difference the way these read or last? the certainly look diffrent on the back is it possible to do the same method at home as the commercially produced cd/dvds are made?
hi store bought are pressed...home made are burnt by a laser store bought read better/last longer (tolerate more abuse) only if you have several 10s of 1000s of £/$ to spare
The binary code on optical media is written as either light bouncing back to a sensor or light being dispersed and missed by the sensor. Store-bought movie discs create the difference by having microscopic pit molded into the plastic so that the laser light changes when it falls over the edge of a pit. Recordable DVDs mimic that behaviour by having dark marks either "burned" into a photo-sensitive dye (DVD-R/+R) or made my melting a semi-metal alloy (DVD-/+RW/-RAM.) Dyes and rewritable alloys are less stable than polycarbonate plastic, so molded DVDs are far more likely to last longer under the same conditions.
