These are usually encoded in x264 or x265 codecs to maintain high quality (usually 720p resolution) at a lower bitrate.

Indicates the vertical pixel count. 1080p is Full High Definition, while 720p is Standard HD. The Dilemma of Extreme Compression (The 800MB File)

The collection includes all eight movies released by between 2001 and 2011: Harry Potter and the Sorcerer's Stone (2001) Harry Potter and the Chamber of Secrets (2002) Harry Potter and the Prisoner of Azkaban (2004) Harry Potter and the Goblet of Fire (2005) Harry Potter and the Order of the Phoenix (2007) Harry Potter and the Half-Blood Prince (2009) Harry Potter and the Deathly Hallows – Part 1 (2010) Harry Potter and the Deathly Hallows – Part 2 (2011) Advantages of 800MB BDRip Collections

High-definition video takes up massive amounts of space. To make these films more accessible for digital storage, they are often compressed. The Trade-off: 800MB vs. Full Blu-ray Quality