Preview Folder - Big Size of Pictures

I've just started to add photos to my Library on iphoto, but I decided to keep the originals in an external disk, as I don't want my mac book pro completly full of photos.
So I selected under preferences -->Advanced -->no copy elements to Iphoto library
So that way I'm keeping out of Mac disk the GB of photos I have.
My Question is Why Iphoto is keeping a folder called Previews (near Masters and Originals), with exactly the same photos I have in the external disk and with the same size?
Can anyone tell me how To disable this? Is it really necessary for Iphoto do a Preview with that size ?
Thanks
Francisco

Thanks for helping me Terence,
The reason I'm using a referenced library or external disk, it's because I already have 150 GB of info and over 55.000 photos, so I can't have all that info inside Mac. But I will try your advise you provide on the other forum
"Make sure the drive is formatted Mac OS Extended (Journaled)
1. Quit iPhoto
2. Copy the iPhoto Library from your Pictures Folder to the External Disk."
Can I use Time capsule (2Tb) to do this? Is it ok?
"As to the Previews:
What exactly are you importing? Raws? Jpegs? Do the Jpegs have Exif tags written to them?"
I'm importing Jpeg and Raws, yes Jpeg have Exif Tags
Thanks
Francisco

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Can someone clear this up a bit?
My LR 2.1 preview folder is at 12gb, and I want to get that under control. After reading all of the threads here about previews it seems one of the best choices is just delete the folder and then let LR 2.1 rebuild it. But before I do that I want to set my preview options correctly. The info below (found in another thread) is good, but confusing at the same time.
1) "You have 4 choices: 1024, 1440, 1680 and 2048. If all you want is standard-sized then choose a size equal to or slightly less than your screen size" Is this based on the long edge of your screen size? long edge meaning 1280.
2) "Now take the example of a larger camera, say a 8MP camera such as the Canon 1DMKII with an image size of 3504 by 2336 pixels. With the standard-sized set at 1680 pixels the full-size will again be purged (i.e. 3504/2=1752 pixels, which is greater than 1680 pixels)". This formula looks to be saying the long edge, correct?
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B) 1:1 previews uses images pixel sizes?
C) you only have one setting to control previews for standard and 1:1? (that being the "You have 4 choices: 1024, 1440, 1680 and 2048")
This is interesting because in my case my screen size in 1280, but most all my Nikon D3 images are 42xx. So if I want to keep my previews folder clean and growth controlled, I should basically set my previews option to the lowest 1024? And one more interesting tid bit, how does a cropped image play into the 4 choices? Say I crop a 42xx image to oh say 2024, then my 1:1 for that image will never be purged? I'm probably missing something here, and it wouldnt be the first time.
Why is the Lightroom preview folder so big, even after purging the 1:1 previews?
Ian Lyons - 05:18am Aug 18, 2008 Pacific
1:1 or full-size previews take up a large amount of HD space, often many 10's of GB's. This is why building them on demand is an alternative to building them up front, and why you have options for auto or manually purging them. That said, it may not always be possible to delete 1:1 previews - more later.
Standard-sized previews are based on the pixel size option you chose in Catalog Settings. You have 4 choices: 1024, 1440, 1680 and 2048. If all you want is standard-sized then choose a size equal to or slightly less than your screen size. Lr also builds smaller versions at the same time. These are used for the thumbnail, 1:2, 1:3 and 1:4 zoom levels. Adobe call this the "preview pyramid".
1:1 previews will not be deleted unless your chosen standard-sized preview is less than half the size of the full-sized preview. For example, you have images with pixel dimensions of 3072 by 2048 pixels (6MP camera such as Canon 10D) and have selected 1680 pixels for standard-sized previews. Since a 1680 pixel preview is more than half the size of the original the full-sized preview will be kept, even after using the purge 1:1 preview command. Had you chosen 1440 pixel for standard-sized previews then the full-sized would have been purged (i.e. 3072/2=1536, which is greater than 1440). Now take the example of a larger camera, say a 8MP camera such as the Canon 1DMKII with an image size of 3504 by 2336 pixels. With the standard-sized set at 1680 pixels the full-size will again be purged (i.e. 3504/2=1752 pixels, which is greater than 1680 pixels).
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The chance of an answer is inversely proportional to the length of the posting. ;)
You do not indicate what your preview setting was while you accumulated a 12Gb preview folder. Nor do you indicate how many images are in your catalog.
Given your screen size of 1280 (laptp?) I would set the preview size to 1440 since this is still far less than half of your D3 images.
Cropping - I'll safely guess - has no effect on your preview size choices.
I confess that preview sizing and purging is confusing. I avoid the confusion by shouting "more disk, mama".

IPhoto Preview Folder Twice the Size of Masters Folder

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Why is the Lightroom preview folder so big, even after purging the 1:1 previews?

1:1 or full-size previews take up a large amount of HD space, often many 10's of GB's. This is why building them on demand is an alternative to building them up front, and why you have options for auto or manually purging them. That said, it may not always be possible to delete 1:1 previews - more later.
Standard-sized previews are based on the pixel size option you chose in Catalog Settings. You have 4 choices: 1024, 1440, 1680 and 2048. If all you want is standard-sized then choose a size equal to or greater than your screen size. Lr also builds smaller versions at the same time. These are used for the thumbnail, 1:2, 1:3 and 1:4 zoom levels. Adobe call this the "preview pyramid".
1:1 previews will not be deleted unless your chosen standard-sized preview is less than half the size of the full-sized preview. For example, you have images with pixel dimensions of 3072 by 2048 pixels (6MP camera such as Canon 10D) and have selected 1680 pixels for standard-sized previews. Since a 1680 pixel preview is more than half the size of the original the full-sized preview will be kept, even after using the purge 1:1 preview command. Had you chosen 1440 pixel for standard-sized previews then the full-sized would have been purged (i.e. 3072/2=1536, which is greater than 1440). Now take the example of a larger camera, say a 8MP camera such as the Canon 1DMKII with an image size of 3504 by 2336 pixels. With the standard-sized set at 1680 pixels the full-size will again be purged (i.e. 3504/2=1752 pixels, which is greater than 1680 pixels).
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The chance of an answer is inversely proportional to the length of the posting. ;)
You do not indicate what your preview setting was while you accumulated a 12Gb preview folder. Nor do you indicate how many images are in your catalog.
Given your screen size of 1280 (laptp?) I would set the preview size to 1440 since this is still far less than half of your D3 images.
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