There is a significant difference between CD, DVD, BluRay and USB in terms of cost per gigabit, ... etc!
USB is just an interfacethe CD, DVD, BluRay are data carriers , media, data storage devices.
The main difference for a user, who also interests him the most, is the amount of data and the price per GIGABIT of data.
As of Thursday, June 7, 2018
CD 600-900 MB DVD 4.7 dual-layer 8.5 GB BluRay 25 GB and dual-layer 50 GB
CD 700MB ~ 0.35 $ / 1GB DVD 4.7GB ~ 0.05 $ / 1GB Blu-Ray 25 GB ~ 0.02 $ / 1GB * Plus acquisition costs!
Hard disk (HDD) ~ 0.03 $ / 1GB Hard drive (SSD) ~ 0.27 $ / 1GBIf wrong ... ---contact---
What is a CD?
A compact diskette is a digital optical data carrier that is scanned with the aid of a laser in order to interpret the data stored on it.
... technical data CD
What is a DVD?
Essentially, a DVD is also a digital or optical data storage medium that looks similar to a CD, but has a higher storage capacity. Around 10 times the data in relation to the CD.
... Technical data DVD
What is a Blu-Ray?
Basically the same again, only with more data than a DVD. Is also a digital data storage medium; it looks similar to DVD, but has a higher storage capacity. Around 10 or 5 times as much data as compared to DVD.
... Technical data Blu-Ray
What is dual layer?
This means that the DVD or Blu-Ray has two layers, so it can hold twice the amount of data. Simply put, two bags fit twice as much. Literally speaking, a laser reads both layers from the inner lane to the outer lane. With DVD-Video, the lower layers are read from the inside out, the upper layer backwards from the outside towards the inner lane.
FAQ 59: Updated on: 29 November 2020 10:50