It depends on the map.
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This all depends on your maps. A copy of Minecraft that has no started maps is around 228KB. But after you start playing this will go up.
Dead Lox user name on Minecraft is Deadlock. Deadlock adventure maps can be downloaded from the free down load Minecraft website. The site also has links to other adventure maps for Minecraft.
The PS3 can only get downloads for games from thePlayStationStore. There is no custom maps available at the store so no there is no custom Zombie Maps. It's a PC thing to mod games with unauthorized software not approved by the copyrighted game developer
I cannot speak about all the maps, because I have not downloaded them all but you can't tell if it does if your only criteria is "a minecraft map." however, actual, normal minecraft maps do not contain any viruses. If you want, you can scan it for viruses with some software
Adventure maps are usually used in minecraft maps it allows you to not break certain blocks but you can use a certain item to break that block.