While CEATEC has been over for nearly a week, news of new technologies is still trickling in. According to Tech-On!, Hitach-Maxell demonstrated a new read-only medium based on the holographic recording technology. This slightly larger than a postage stamp, this HROM medium will eventually hold 4GB of data and offer a data transfer rate of 16 Mbit.

Hitachi Maxell Ltd. demonstrated playback of music data read from HROM, a read-only medium based on the holographic recording technology at its booth at CEATEC Japan 2007.

Hitachi Maxell is focused on the development of holographic medium in collaboration with InPhase Technologies Inc., a US venture company. The HROM medium was also developed based on InPhase's proprietary holographic technology.
This HROM technology is still far from being perfected. Hitachi Maxell still needs to find a way to handle vibrations and extend the operating temperature range before it can be put in production. If you'd like to read more, the entire article can be found here.