The movie played by the high-definition player is BD. There is no HB, so it should be HD.
Both are high-definition formats. BD is patented by Sony, and HD is owned by Toshiba. However, after competition, HD has Died, now only bd is left, bd means Blu-ray disc, which is a disc with larger storage capacity. Although the hd format has disappeared, it can now also be used to refer to the high-definition format. So strictly speaking there is no comparison with higher definition.
Formats with a physical resolution of 720p or above are called high definition, and the English expression is High Definition, or HD for short.
Blu-ray Disc (BD) is one of the next generation optical disc formats after DVD, used to store high-quality audio and video and high-capacity data storage. Blu-ray disc is named because it uses a blue laser beam with a wavelength of 405 nanometers (nm) to read and write (DVD uses a red light reader with a wavelength of 650 nanometers, and CD uses a wavelength of 780 nanometers). The capacity of a single-layer Blu-ray disc is 25 or 27GB, which is enough to record a high-resolution video of up to 4 hours.