Kev cog lus me me yog qhov nruab nrab khaws cia qhov nruab nrab. Kev tsim thev naus laus zis thiab cov qauv ntawm lub cev ntawm lub teeb xim laser ua qhov sib txawv ntawm hom discs. Txhua daim CD muaj nws lub hom phiaj thiab cov yam ntxwv khaws cia cov ntaub ntawv.
CD-ROM
CD-ROM, lossis Compact Disc Nyeem ntawv nkaus xwb Lub Cim Nco, yog ib qho ntawm thawj hom ntawv tshwm sim ntawm lub khw muag khoom laser. Thaum pib, xws li cov discs tsuas yog npaj rau sau cia cov suab paj nruag, tab sis tom qab ntawv tau tsim kho rau kev khaws cia lwm hom ntaub ntawv. Thaum pib, cov tshaj tawm no yog 12 cm inch thiab tuaj yeem tuav txog 650 MB ntawm cov ntaub ntawv, uas sib npaug li 74 feeb ntawm cov suab kaw cia. Tom qab ntawd, cov ntim ntawm cov lus tshaj tawm tau nce mus rau 700 MB, uas tso cai ntev txog 80 feeb ntawm cov suab kaw. Tsis tas li, cov ntaub ntawv nqa khoom nrog lub peev xwm nce mus txog 800 MB tau tsim, tab sis lawv tsis tau ua kom dav, vim tias lawv tsis tuaj yeem txheeb xyuas tau tseeb ntawm qee lub zog.
Rau lub hauv paus ntawm CD-ROMs, sau tau cov ntawv CD-R (cov ntawv tawm dawb rau ib zaug kaw) thiab CD-RW (rewritable discs) tau ua. Tsis tas li, CD DA lossis Audio CD tus qauv tshwm sim, uas tau tsuas yog cia rau khaws cov nkauj. Cov ntaub ntawv tshaj xov xwm nrog cov muaj peev xwm siv cov ntawv sib tham hu ua CD-I nrog ntau yam ntawm CD + G, VCD (Video CD) thiab Karaoke CD.
DVD-ROM
DVD-RAM tau dhau los ua theem tshiab hauv kev txhim kho cov ntaub ntawv khaws cia thev naus laus zis ntawm cov xov xwm laser. DVD pub rau cov neeg siv khaws cov ntaub ntawv ntau ntxiv, nrog rau sau cov ntaub ntawv ntau zaus. Kev tsim thev naus laus zis tshiab tau nthuav dav cov peev txheej sau cia DVD ntau dua li cov ntaub ntawv tuaj yeem khaws cia (ntawm 2.6 GB rau ib txheej discs mus rau 9.4 GB rau dual txheej discs). Daim DVD DVD pib tso tawm, uas tso cai rau kom haum cov kab xev nrog cov ntau ntawm cov suab tso suab (rau 5.1 tshuab). Daim DVD tau tawm mus dav thiab tau siv ntau dua rau kev sau cia, khaws cov vis dis aus thiab txhua yam khoos phis tawj.
Blu-duab tshav
Blu-duab tshav Disc tau dhau los ua 3 tiam ntawm CDs. Cov hom ntawv tso cai rau koj khaws cov ntaub ntawv mus txog 33 GB ntawm ib txheej xov xwm thiab nce mus txog 66 GB rau ntawm ob txheej. Qhov ntim tso cai no tau ua tiav vim qhov nce ntawm lub suab khiav, uas tso cai rau koj khaws cov vis dis aus zoo thiab suab tso rau ntawm Blu-Ray disc. Kuj Blu-duab tshav yog siv los sau txhua yam xov xwm digital thiab txhawb nqa kev tsim cov ntawv sib txuas lus.
Niaj hnub no, muaj cov thev naus laus zis xws li BD-Live (sib tham sib cuam tshuam disc), BD DL (dual txheej optical disc), BDXL (3 lossis ntau cov khaubncaws sab nraud povtseg hauv ib qho xov xwm). Blu-duab tshav BD-R (sau tau disc), BD-RE (rov qab siv xov xwm) thiab BD-RE DL (kuj rov ua dua tshiab) yog tam sim no muaj nyob rau ntawm kev ua lag luam. Lub sijhawm no, thev naus laus zis tau tsim los tsim BD-ROM uas siv cov encryption tshwj xeeb los tiv thaiv cov ntaub ntawv kaw tseg los ntawm kev luam theej.
