After running defrag on my Windows partition on my mac pro, I realized I didnt have a defrag for the Yosemite drive. I know many people claim defrag isnt needed for a mac, but I disagree with that, so went looking for mac defrag. I found iDefrag. It seems nice, I tried the demo. I was also curious about a PPC version, and emailed them to ask about it. I'll share the reply here: -------------------- No, you wouldnt need to buy seven copies. One would suffice, though we do ask that you dont run more copies simultaneously than you have licenses. As for versions, we cant guarantee that anything past version 2.0.5 will run on 10.5.8. Newer versions (including 2.2.8) might work, but also might very well not. Its unlikely to be a case of disk corruption problems its more likely that some features will simply fail to work (e.g. the reboot-and-defragment mode might not work, or the Create Boot Disk window might fail for some obscure reason). Version 5 certainly isnt going to work on PowerPC machines it doesnt have any PowerPC code in it any more. As for getting back-versions, at the moment theyre available once youve bought iDefrag via the release notes link on the My Account page. Im intending to maintain access to older versions for those who need it, but that might not be possible on day one of our new website when it finally arrives (in which case I could probably send copies by e-mail given the tiny number of people who want older versions). Kind regards, Alastair. -------------------- Anyway, just wanted to share that for anybody that was curious.