What is the difference between the 3 folders Data, Original & Modified.

When viewing my photos in iphoto if I go to pictures > iphoto library I see for folders. Data, ipod photo cache, Originals & Modified. I want to know why there is a folder labeled Data and what is its use . Why is it there?

Tj005
A Note about the iPhoto Library Folder:
In this folder there are various files, which are the Library itself and some ancillary files. Then you have three folders
1. Originals are the photos as they were downloaded from your camera or scanner.
2. Modified contains edited pics, shots that you have cropped, rotated or changed in any way.
This allows the Photos -> Revert to Original command - very useful if you don't like the changes you've made.
3. Data holds the thumbnails the the app needs to show you the photos in the iPhoto Window.
All of the files and folders are necessary for iPhoto to work.
It is strongly advised that you do not move, change or in anyway alter things in the iPhoto Library Folder as this can cause the application to fail and even lead to data loss
Regards
TD

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First, back up by dragging (copying) the library folder AS AN ENTITY to the backup location. Do NOT attempt to back up portions.
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Third, you might want to break your library into several DVD-sized libraries (this might take some educated guesses). I did it by duplicating my library several times and then carefully deleting appropriate photos from each one. Back them all up the normal way and also burn each one onto DVD and carry a pack of DVDs with you when you travel. With multiple libraries, you need to change the name of each library folder to something that makes sense to you (that's the ONE safe change that you can make to the library). iPhoto will always remember the most recent library that it accessed. Whenever you wish to change to a different library, hold down the Option/Alt key while starting iPhoto and follow directions.

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What is the difference between the 3 folders Data, Original & Modified.

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