Comparison of optical data carriers
With optical media image data carriers are not necessarily meant, but those with optical or magneto-optical read-write technology. These data carriers can be tapes, floppy disks or disks, and the data can be stored on them in a wide variety of analog and digital formats. There are data carriers that can only be written to once by large systems, those that can also be written to with small devices but only once ( WORMs ), and finally also erasable and rewritable with small devices. The latter are generally fairly short-lived media (at least when compared to books).
Many of the newer (21st century) optical data carriers look the same as one another, namely like a classic CD known from the music field , but differ significantly in their technical properties. The following table gives an insight into the technology of the most popular optical data carriers, the CD , DVD , HD DVD and Blu-ray Disc .
Comparison table
| CD | DVD | HD DVD | Blu-ray disc | ||
|---|---|---|---|---|---|
| Storage capacity ( SL / DL / TL / QL ): | 540-900 MB | 4.7 / 8.5 GB | 15/30/51 GB | 25/50 & 66/100 & 128/200 GB | |
| Market launch: | 1982 (still available) |
1996 (still available) |
2005 (already discontinued) |
2006 (still available) |
|
| Data rate (1 ×): | 1.228 MBit / s (data), 1.411 MBit / s (PCM audio) |
11.08 Mbit / s | 36.55 Mbit / s | 36 Mbit / s | |
| Reading method : | CAV / CLV | CLV | |||
| Laser - Wavelength : | 780 nm ( near infrared ) | 650 nm ( red ) | 405 nm ( violet ) | 405 nm (violet) | |
| Numerical aperture (NA): | 0.45 | 0.60 | 0.65 | 0.85 | |
| Focus diameter: | 650 nm | 542 nm | 312 nm | 238 nm | |
| Track spacing: | 1.60 µm | 0.74 µm | 0.40 µm | 0.32 µm | |
| Laser point: | 2.11 µm 
|
1.32 µm 
|
0.76 µm 
|
0.58 µm
|
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Video codec : |
MPEG-1 |
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| MPEG-2 |
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| H.264 / MPEG-4 AVC |
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| VC-1 |
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Audio codec : |
Linear PCM |
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| Dolby TrueHD |
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| DTS-HD Master Audio |
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| Dolby Digital |
(see AC-3 CD )
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| DTS |
(see DTS-CD )
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| Dolby Digital Plus |
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| Maximum video resolution : | 480 × 576 ( PAL ) 480 × 480 ( NTSC )
|
720 × 576 (PAL) 720 × 480 (NTSC) |
1920 × 1080 ( Full HD ) | ||
| Refresh rate : | 25 Hz (PAL) 29.97 Hz (NTSC) |
24/25 / 30p, 50 / 60i | 24/30/50 / 60p, 50 / 60i | ||
| DRM : | no | AACS | AACS / BD + | ||
| Data block size : | 2048 bytes | ||||
Individual evidence
- ↑ On the optical storage technologies from the perspective of the eighties: Koschitz Norbert: Von der Computerwissenschaft zum Wissenschaftscomputer. Information processing with archive and documentation systems. in: fascination. 5/1988, pp. 60-69 with non-public domain image material, eg 2 Gb optical disk from Philips 8 inch
- ↑ Compact Disk Standards & Specifications (PDF file; 20 kB)
- ↑ DVD Format / Logo Licensing Corporation ( Memento of the original from December 19, 2008 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ Blu-Ray FAQ
- ↑ White_Paper_General_4th_Jun_2015 - White_Paper_General_4th_20150817_clean.pdf. August 2015, accessed November 29, 2016 .
