THE Government is to rethink its definition of a ''computer recovery disaster'', following concerns from Mr Jenney that no cross-departmental plan existed to deal with a major breakdown. The definition was first introduced in 1985. In the light of increasing complicated computer technology, the Director of Information Technology Services Lau Kam-hung told legislators yesterday that the department would use two criteria to redefine the term. One was to consider what would have to go wrong before a breakdown could be termed a disaster. The second was how long the computer fault would last before remedial measures should be activated. Mr Lau said there would be different definitions of disasters for different computer systems. The current definition of a computer disaster as a ''15-day system breakdown'' was ambiguous. At present, the permanent disaster recovery centre in Tsuen Wan could recover 75 per cent of the overall computer capacity in the event of a breakdown. Frequent drills and rehearsals were underway. Mr Lau rejected independent legislator Emily Lau Wai-hing's call to offer a computer disaster recovery service to the private sector, saying that would create a problem when disasters happened simultaneously in private and public systems. To minimise the effects of a major breakdown, disaster recovery plans had been developed by departments. Mr Jenney said in his report that the planning of disaster recovery plans was left to individual departments. The Government lacked a cross-departmental plan, even though computer applications were regarded as critical. He recommended that such a plan should be ready as soon as possible.