Assuming these fundamental uncertainties can be resolved, the report cites other computer and software difficulties. Yet whereas the shuttle's computers are designed to reain in operation for 1,000 hours without breaking down, the computers on board the satellites used in an SDI system would have to be built to break down only once every 100,000 hours. Parnas was appointed a member of the panel that wrote the report. However, he resigned a few weeks after its formation, saying its work was pointless because SDI's software requirements were impossible to fulfill. An SDI system almost certainly would be.
Effective shielding is difficult.
Such a system would involve less complex and more testable software, and could be adapted more easily to change. With all respect, I am having trouble accepting that there is not some misunderstanding or overdramatization in this account. If this is true, the risks in question were certainly unnecessary. Report problems with the web pages to the maintainer .