Dual layer dl 355 512 dual layer recording also known

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Dual-Layer (DL) 3:55-5:12 Dual layer recording, also known as double layer recording, allows DVD-RW discs to store more data,up to 8.5 gigabytes per disc compared to the 4.7 gigabytes of single layer discs. A dual layer disc differs from a single layer disc because it has a second physical layer within the disc itself. The drive with dual layer capability accesses the second layer by shining the laser through the first semi-transparent layer. DVD recordable discs using dual layer technology are backward compatible with some existing DVD players, DVD-ROM drives, and many DVD recorders. The recording speeds reached by dual layer media are still well below those of single layer media. Dual layers DVDs are recorded using opposite track path or OTP. DVD-ROM discs mastered for computer use are produced with track zero starting at the inside diameter like with a single layer DVD. Track one then starts at the outside diameter. This speeds up the transition as the layer changes because although the layer does have to refocus on layer one, it doesn't have to skip across the disc to find it. However, DVD dual layers have slower write speeds when compared to ordinary DVDs. When playing a dual layer disc, a slight delay may be seen in the playback when player changes layers. Summary 5:13-5:26 Well, that's it for this lesson. In this lesson, we reviewed DVD discs. We talked about how a DVD works. We talked about the different formats used for DVD discs. We looked at DVD video, DVD-ROM and DVD-RW, and dual layer technology. Blu-ray 0:00-0:42
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In this lesson, we're going to learn about Blu-ray discs. Blu-ray was originally developed for high definition video and expanded content on movie discs. However, it can also be used for data storageon a PC system. Blu-ray is intended to eventually replace DVDs. A Blu-ray disc is 120 millimeters in diameter and 1.2 millimeters thick–the same size as DVDs and CDs. A single-layer Blu-ray disc can hold up to 25 gigabytes of information. A dual-layer Blu-ray disc can hold up to 50 gigabytes of information. Triple- layer discs that hold 100 gigabytes and quadruple layers that hold 128 gigabytes are also available. Blu-ray Formats 0:43-2:19 The read-only format is called a "BD ROM." The recordable format is "BDR." BDRs can be written to only once. A "BD-RE" is the re-writable format of Blu-ray. BD-REs can be erased and re-recorded multiple times. Ultra HD Blu-ray format uses 4K Blu-ray discs that support a 3840 by 2160 resolution, video with framerates up to 60 frames-per-second, and object-based immersive sound. This means better video and better audio. Also, Ultra HD Blu-ray players are backwards compatible and can play all formats of Blu-ray discs. The Ultra HD disc with the digital bridge feature will allow you to copy Ultra HD Blu-ray content to an external hard disk drive and to portable devices like smartphones and tablets.
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  • Spring '14
  • Serial ATA

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