Here https://en.bitcoin.it/wiki/Securing_your_wallet#Windows it says ''Use the third-party disk image encryption program of your choice to create and mount an encrypted disk image of at least 5GB in size. This procedure stores the entire block chain database with the wallet.dat file so the required size of the encrypted disk image required may grow in the future.''

1. It is my understanding that the space required for wallet.dat file would be substantially smaller than 5GB, am I correct? What size would you recommend for wallet.dat only?

2. What space would you recommend for the whole of Bitcoin-Qt? Although I have been using the application for a few hours the data size is now 8GB (probably due to historical block chain data) - this would mean the info on the wiki is outdated?

Thanks