1. References

SD Blu-ray disc is a Blu-ray disc on which the video is typically standard-definition television quality but the audio tracks can be HD quality, e.g. Dolby TrueHD.

This is usually because the original content (e.g. a concert, show, or a low-budget film) was shot on standard-definition video or in other low-definition format. Thus the original content cannot be presented in high definition.

It has been said{{By whom|date=September 2016}} that standard definition content on Blu-ray and standard definition content on DVD do not look the same. This is because compression is far better on Blu-ray, as will naturally be the encoding, and it is also possible to provide lossless audio.^[1]

In most instances, SD on Blu-ray titles reuse previous DVD mastering and are done for the convenience of having content that would otherwise span many DVDs on substantially fewer Blu-ray discs.^[2](e.g. The "SD on BD" release of Samurai Pizza Cats has all 52 episodes on a single disc rather than the 8 discs of previous DVD releases.)^[3]

This is a feat for Discotek Media after feedback on the concept from anime collectors. Starting from May 2018, more and more SD Blu-rays collections have been made, and something Section23 Films started to take advantage on since December 2018.

An example of an SD Blu-ray disc is Live at the Rainbow '74 by Queen. The visual content, filmed for TV in 1974, does not meet normal Blu-ray standards, yet it has been released in that format, allowing for the sound to be reproduced in the best possible way.

References

• History of Thomson, Georgia
• History of Thomson, Minnesota
• History of Thoricus
• History of Thor, Iowa
• History of Thornburg, Iowa
• History of Thornton, Colorado
• History of Thorold
• History of Thorsby, Alabama
• History of Thoubal district
• History of Thousand Oaks, California
• History of Three Forks, Gallatin County, Montana
• History of Three Points, Arizona
• History of Three Rivers, Texas
• History of Thrissur district
• History of Thrissur Metropolitan Area
• History of Thun
• History of Thunder Bay
• History of Thurgau
• History of Thuringia
• History of Thurman, Iowa
• History of Thusis
• History of Thái Bình
• History of Thái Nguyên
• History of Thônex
• History of Tiachiv