There is not a hard concept involved here. Ritek, CMC, Ricoh, Falcon and others are crap. Even if they work for you now, at a 50% failure rate, the fact that they will delam or loose data in the future is damn near assured. If you're getting a 50/50 success to failure rate, double the cost of the crappy Riteks and then compare the cost to Verb DL's in terms of media, time and frustration...simple math and common sense...