> corrupted simultaneously This sounds like a software bug. Something like - {copy a to b, checksum a--b} Instead of - {copy a to t, checksum a--t, copy t to

> corrupted simultaneously This sounds like a software bug. Something like - {copy a to b, checksum a--b} Instead of - {copy a to t, checksum a--t, copy t to b, checksum a--b} I bet the fix is along these lines, with the caveat of real time systems/etc.