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I was using WinXP with Parallels 7 with no problem whatsoever... So due to some apps and dev things requiring me to upgrade to Win 8, I decided to...
got a similar problem, I just tried to increase mine (didn't check/uncheck anything though).. and now my HDD is "corrupted" and can't boot.......
I just upgraded to Parallels 8, and I went to resize my VM HDD and bam! Suddenly it fails to boot and it says the HDD is corrupted... I was...