Upgrading to Mavericks with problematic Aperture Lib

The library (~100GB) is on the internal HDD, but the masters (~1TB) are on an external HDD. (I'm not sure this answers your question.)

Note: In earlier years, I used a third party utility to extract some events from the iPhoto lib, but recently I have only used the built-in functionality.

As to recurring errors, my opinion is that there are errors that cannot be detected, or else they cannot be repaired, by the repair utility.

One example is that there seem to be "covert" items. At least some of these apparently are photos that I deleted long ago, but that were not completely expelled. A clue to this are some old keywords that appear in the Keywords list, and may or may not show non-zero counts. These items cannot be found by filtering, so they cannot be tracked down. I have found some of these items by creating a new project and moving all selected images from the old to the new project, then deleting the old project. The total item count will change and there may be things in Trash, which cannot be viewed but can be deleted. I have sometimes found errors, by accident, by changing the filter settings in a new way (this is very rare, and make no obvious sense).

Another example is that trash often shows up after I export groups of projects as new libraries, then I delete the old projects from the main lib. And, I'm finding many of these "ghosts" in the new lib; these have no links to reference files, though they are not managed. So far, repairing the new libs seems to be effective (fingers are crossed).

Another example is that there are many images that I haven't touched in several years, and may have Upgrade buttons on some adjustments. On some of these photos subsequent adjustment fails (expecially curves). Reimporting the photo is the only cure for these. In many cases applying the same adjustments to the reimported photos have a different effect.

Journaled HFS+

Sorry, I don't know how to tell. File names are both u/l case though.

Just checked and I can have two files with the same name with one including a cap. So, yes.

I just tried it a few more times, and it turns out I cannot create a folder with a lowercase name alongside another...the same for both the internal and external HDD. Now I don't know why it looked like I could earlier. Both are formatted at the factory (MBP internal HDD and La Cie external HDD). Sorry for the confusion on this!

Disk Utility says: Mac OS Extended (journaled). System Profiler showed HFS+ Journaled (as stated above).