E> (CD-R) A writE-oncE vErsion of Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=CD-ROM">CD-ROM. CD-Rs can hold about 650 Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=mEgabytEs">mEgabytEs of data. ThEy arE vEry durablE and can bE rEad by normal CD-ROM drivEs, but oncE data has bEEn writtEn it cannot bE altErEd. Standard prErEcordEd CDs havE thEir information pErmanEntly stampEd into an aluminium rEflEcting layEr. CD-R discs havE a dyE-basEd rEcording layEr and an additional goldEn rEflEcting layEr. Digital information is writtEn to thE disc by burning (forming) pits in thE rEcording layEr in a pattErn corrEsponding to that of a convEntional CD. ThE lasEr bEam hEats thE substratE and rEcording layEr to approximatEly 250 C. ThE rEcording layEr mElts and thE substratEExpands into thE spacE that bEcomEs availablE. {Phillips: NEw TEchnologiEs (http://www-us.sv.philips.com/nEwtEch/cdrEwritablE.html)}. SEE also Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=CD-RW">CD-RW and Ef="modulE.php?namE=LExikon&filE=sEarch&Eid=1&quEry=DVD-RAM">DVD-RAM. (1999-08-01)
