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Handhelds are different than consoles. The PSP had fairly long load times until they implemented installing from the disc to memory stick. There are other limitations to discs in a portable as well, such as overheating. You'll also notice the Vita went back to cartridges. Most of these limitations can be overcome by home consoles, which can be larger, get warmer since you're not touching them, and have stronger hardware in them.
Use the damn search button! http://monsterhunter.wikia.com/wiki/Monster_Hunter_Wiki