from what i have read, kreon drives can sometimes return a bad angle for rips
to quote the man himself in the following thread
http://www.xboxhacker.net/index.php?topic=11927.0"Let's put this bad angle thing to rest! There's no such thing as a bad Kreon rip of any kind, but it is true, that the problem is/was more likely to occur, with images created using a 'Kreon drive'.
The reason for this, is that only angles of 0-359 degrees can occur in real life situations, and an unfortunate combination of adding jitter without doing an overflow check in the early versions of the iXtreme firmwares, could cause angles of 360 degrees or more to be returned. There are four angles stored in the SS, but only one of them has the potential to cause the problem. This one specific angle always takes a value close to 359, which could cause the older iXtreme firmwares to fail due to the missing overflow check in the jitter calculations. The only real reason for Kreon rips to fail more often than others, is that the angle in question is very likely to take the value of 359 degrees, when using a Kreon drive, while values in the range of 355-357 degrees are seen for most games ripped using a 0800 drive. Adding jitter (+1 or -1 typically) to 355-357 can not cause the resulting angle to overflow, while adding jitter to 359 can cause the angle to overflow and return an angle of 360 degrees or more.
All Kreon firmwares relies on fixed angle values, since they never really change much. This is true for all known games to date, but that is likely to change in the future, in which case the 'Kreon drives' will face quite a challenge. There's no doubt that the 0800 firmware will produce the best possible rips, as the angles mentioned above will be based on calculations instead of fixed values. This is, however, only a problem if the protection scheme is changed, so for now there's no need to panic - you can still use your Kreon drives for your everyday ripping Smiley
/Kreon"
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