Sqrl on 29 July 2008
Revisions were made to the data for the reasons TheSource described.
In short VGC estimates sold to consumer and Sony tracks sold to retailers (See the animation in my signature for a better explanation). When Sony releases quarterly information it is examined to see if adjustments need to be made. The PS3 sold roughly 2.5m consoles during the quarter and and the correction was for about ~100k. So it was a small correction.
Essentially VGC estimated the quarterly sales to within ~4%, that is a sound estimation by any standard. But that doesn't mean we ignore the hard numbers Sony provides. It still makes perfect sense to adjust numbers to be as close as possible when better data becomes available.
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