I think that the theory is if you have bad sectors on your drive, that it will take many read retries to get good data from the drive to fire a recording. Since video read/swrites take priority over SW and database reads, it could take up to a minute or two for the SW to do all of the accesses to the drive needed to actually start the recording. I am not saying I have knowledge of this from logs or knowledge of the tivo SW. I am to a degree repeating what I have read here. The other theory about late-starting recordings is that the clock on from one satellite/transponder (I think the time is maintained on the ground, not on the bird) can be off from the others. If your tivo is on a channel that has it's clock late, by the time the recording starts, the progam on another transponder already started. Obviously, this has nothing to do with the hard drive. But the effects of these two problems would be addative. The time-sync issue shows up for all users (of the transponder with the issue) and so it is very prevalent when it shows up.