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Question: Why does have Aperture so huge libraries,even the master files are stored on e external drive
Part of it may be that Aperture creates it's own full-size previews. You can adjust the size of these in the Preferences menu.
Personally, I've been using Aperture since v1.5. I've dealt with all the black out issues in v2, and have had issues with my system not detecting my library back in 2011.
About six months ago, I began thinking that getting into the Adobe LR environment, building my catalogues, and setting up preference files, might be a much safer bet longterm. Adobe, it seemed, was committed to professional photographers, with their perpetual updates of both LR and PS. Apple, on the other hand, has had a history of dropping professional software on a whim (I'm still a little burned about Shake). I bought, and spent a ton of time trying to work in the LR environment, but workflow just seemed nonsensical. LR was slower, rigid, and, worst of all, lacked the vault backup that I had grown reliant on. Shooting quite a bit of film, and scanning my files, also meant that I needed to do some scratch and dust removal... let's just say LR's spot removal tool is a joke at best. The thing that really sealed the deal for me was the way LR was rendering RAW files from my D700. The files, using the ACR conversion were washed out (some seemed blown out), lacked contrast and depth. Yes, I spent some time working out how to use the camera calibration options, and understand that RAWs aren't going to look great from the get go, and thus needed some work, but my RAWs in Aperture just didn't seem to need all those extra steps.During this time, I also gave CaptureOne, Phocus, and DxO a twirl. While these were all great RAW converters, they simply weren't good cataloguing pieces of software. I ended up buying DxO for their great lens correction modules, and the way some of their "light" adjustments rendered landscape pictures (beautiful use of microcontrast).
I went back to using Aperture, and can honestly say that I'm sticking with it. In light of the Adobe CC fiasco, I think I've made the right call.
In terms of organizing your files, here is a screen shot of what my personal library looks like. A folder for each year, nested folders for the months, each event is a new project. Hope this helps someone.