Japanese Nintendo Direct touches on storage capacity for the Wii U
Go learn Japanese and watch the actual Nintendo Direct Wii U video...
Okay fine the Wii U Basic has a total of 3 GBs and Wii U Premium has 25 GBs of usable space. The Wii U supports up to 2 Terabytes from a single external hard drive connected via USB, and the number of hard drives allowed for use will go up to 2 in the near future.
Also, the SD card may only be used to store WiiWare, Virtual Console, and Wii game save data.
Editor's Note: I've embed the video for those who've taken the time to learn Japanese.
I just watched the NEW Wii U Nintendo Direct (11.14.2012), which explained more hardware specifications, so I'll just talk briefly about this.Due to the data conversions (Don't know the actual terms but I know how it works.), the REAL flash drive space of the consoles have been revealed.
Now, including the data already included in the Wii U at factory settings, which includes User Data, Settings, Default Software, etc. taking up a total of approximately 4.2 GB...
The Wii U does support external hard drives, but "only" up to 2 Terabytes. Now, you could use an external hard drive bigger than 2 Terabytes, but the system will only recognize up to 2 Terabytes for use with the console. At launch, the system, will only support one external hard drive at a time, but on a later system update, the system will be capable of handling two external hard drives, and allow you to transfer data from hard drive to hard drive through the Wii U itself.
It is also important to note that the external hard drives with their own power supply are recommended, and those which get the power from the console itself may have the chance for some malfunctions, and when the hard drive is of that type, it it recommended that you have a "Y-cable type" hard drive which have two cables to connect directly to the system.
One last thing, the SD card will be used solely for the storage of WiiWare, Virtual Console, and Wii game save data, and not for full-game downloads. Also, these types of games are not compatible to play with the Wii U game pad (this is a given.), but they are planning a Wii U Virtual Console Shop in the near future which will allow people to play with the Wii U game pad. (More info yet to be revealed on this topic.)
What do you guys think of this limited storage space of the Wii U itself? People were already complaining how little space there was to begin with, and now these facts are revealed! Well, at least we can have up to 2 Terabytes of storage from a single external hard drive.