CompuServe Messages

HQ5 has both mods to the VTASC and a floor to the amount of compression, which is why it requires 5MB/sec sustained across entire platter. In HQ5 there are more situations where D2 video could be preserved, but still many situations where compression, and therefore some image softening, has to occur. More frequently than in the lower modes the softening can stay at or below what the perceptual psych guys call the JND — Just Noticeable Difference. None of us here think there is anything we've done so far that we can't better if we keep pushing, and we will keep pushing. And as even faster drives come along even more is possible. We're happy with HQ5, and so far all the reports I'm hearing from end users are that HQ5 is making them happy, but that's no reason to rest.