The difference between HD HD version and BD HD version is: different definition, different sources and different data reading and writing methods.

First of all, the clarity is different.

1, HD HD version: HD HD version has lower definition than BD HD version, which is 720P( 1280X720).

2.BD HD version: The definition of BD HD version is higher than that of HD HD version, and it is the original blue disc1080p (1920x1080).

Second, the sources are different.

1, HD HD version: HD HD version is recorded from HDTV signal.

2. BD HD version: BD HD version refers to direct recording through Blu-ray film source.

Third, read and write data in different ways.

1, HD HD version: HD HD version uses blue laser with wavelength of 405nm to read and write data.

2.BD HD version: BD HD version uses near-infrared invisible laser with wavelength of 780nm to read and write data.

Baidu Encyclopedia-HD

Baidu encyclopedia -BD

Baidu Encyclopedia-HD