The new and spacious 120GB Xbox 360 hard drive is locked and loaded in Japan, but before you go out and buy it, here are some reminders that you may find valuable.
The new 120GB Xbox 360hard drive is apparently loaded with some restrictions. The biggest of which is the fact that you cannot combine data from two of the old 20GB HDDs in the new one. That means if you've been storing game data and related stuff in one HDD and used another one to store movies, you'll have to choose which set of files to place in the new drive. Attempting to house both sets will result in only the latter ones being saved.
The other issue is that files from the smaller drives can be transferred to the bigger one, but there's no turning back. The 120GB Xbox 360 new drive won't allow transfer from the 120GB HDD to the 20GB HDD.
This may irk some users who followed Microsoft's suggestion that gamers can buy two HDDs to house their data separately. Whether adjustments will be made when the accessory hits American shores is yet to be seen.