Everything except /Users data, which I’m guessing lives under the Data volume? Run “ls -AF /” in a Terminal window to see a directory listing beyond what Finder displays by default. Unix data resides there under /bin, /sbin, /private, /usr, /var, plus the mach kernel and a few symlinks. Surely Bill’s installed Xcode so /Developer will be there (also visible in Finder).

I doubt Bill would move /Applications, and Software Update is picky about finding Apple’s own apps there. I prefer keeping all apps under /Applications, clearly separated from personal data under home directories. And when you’re the only user of the system there’s not much value to using ~/Applications. I’ve also never had any reason to reorganize third party apps under /Applications into a categorical hierarchy; seems silly since I’m not navigating around in there to launch apps. That kind of organizational structure is more fitting for larger scale client/server deployments.

Sorry if that explanation misunderstands what you’re asking. I’d deserve that for attempting to answer for Bill.

The internal drive on my iMac G5 has three volumes: Macintosh HD (boot volume) [50G/68% full], Users [30GB/62%], Media [154G/92%]. First two and a subset of the third get regular backups (using SuperDuper!). Space on Media fluctuates the most; it’s at a high now but +50GB will be freed soon. iTunes content lives there, which helps keep Users at a more manageable size. iPhoto content will eventually end up there, too.

I recently used iPartition to shrink the Media volume and grow the other two by about 10GB since “diskutil resizeVolume” only supports GPT devices. Also resized the two volumes on my wife’s eMac. I didn’t have enough external drive space to do a complete backup of the internal drives, but could risk losing certain data on them that wasn’t backed up (e.g. EyeTV recordings). Seems likely Apple will add dynamic volume resizing support to Disk Utility in 10.5 but if you want a GUI for it before then check out iPartition. Not sure if the version with GPT support is out of beta yet since I only needed APM support.

I’m curious how you split things up between your partitions… You mention originally had 2 partitioms, where do you put /Applications? Or do you install apps in ~/Applications?

Is there anything beyond /System and /Library on your boot partition(s)?

Enquiring minds and all that…