I'm running OS X 10.58 on a late-2008 MacBook Pro. My HDD has 35 GB available out of a total capacity of 297 GB, but the iDefrag 2.0.5 free demo says the free space is 93% fragmented, and I'm wondering if Mac will do the upgrade to 10.6 okay with his workspace in such a mess.

I'd like to defrag the disk anyway, handling large (video) files as I do, and seeing the spinning "busy" cursor (the "beach ball") too often even in Safari (5.0.6, maintained according to the Macattorney procedures, mostly) but according to the Coriolis website, iDefrag now requires 10.6.

If I merely proceed with the upgrade from 10.58 to 10.6 with this fragmented free space, am I headed for catastrophe?