From the article
Quote:
An nVidia Tegra 2 1GHz chip and 512MB RAM inside take care of the heavy lifting, enabling genuine multi-tasking of Android apps. ...The 4GB onboard storage is expandable by SD card, ...
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The 512MB is RAM not ROM and has nothing to do with storage. For a Linux OS 512MB isn't a tremendous amount, but it is more than sufficient to run applications. The iPad has only 256 MB of RAM according to this
Wikipedia article.
ROM stands for Read Only Memory and is usually no more than a few megabytes. It usually contains the boot code that starts the system up and then the OS is read from the storage.
Etienne66