The key to cracking that nut is apparently the new thermal assisted optical element Fujitsu's developed, allowing for an ultra-tiny sub-hundred nanometer optical spot size, which in turn should enable recording on the one terabit (not byte, let's not get crazy here) per square inch level.
The hardest nut to crack is the entrenched position both sides have taken on four key issues the future of Jerusalem, the status of Palestinian refugees and their descendants, the division of territory between the two sides and security.