Why not? Its not hard to imagine they didnt plan that part of their development differently than they normally do, or didnt know how.
Decent way to handle it, tho its a lot of installs. More than most other games with their 1 time installUnlike similar games though, MGS4 won’t just have you sitting around whilt the data slooooooowly installs itself onto your hard-drive.Instead, you’ll be treated to conversations between characters as the data is written to your PS3, making the whole experience seamless.
http://www.ps3vault.com/mgs4-install...-revealed-2870