What is the thumb64segment.data file, and why so big?

Ok, I finally got my MacBook Pro (first mac) got all my photos approx.7-8k worth into iPhoto. Can someone tell me what are the:
thumb64segment.data
thumb32segment.data
thumbJPGsegment.data
files and why are they in hundreds of MB, and one is ~1.5GB?
Thanks

Thanks toad. You might be right about the color profile, I imported all my photos into iPhoto yesterday and I had left the add colorsync profile checkbox clicked--I'm still trying to figure out exactly what it does and if I should have done that in the first place.
As a side note, and while I have your attention (since you are so good at answering iphoto questions).
I have a Sony V1 camera, which I assume uses the RGB or the sRGB color profile. When I get home tonight, I would like to software calibrate my monitor to 2.2 gama and 6500k white point. What else do I need to do to make sure that my photos are the same accross the board with respect to colorsync/color profile.
I rarely print photos (never at home), usually through imagestation.com (maybe through apple's service from now on, but I doubt it). I understand that assuming these services dont discard the color profile embeded into the image file I send them, I should aim to send them the file with the same color profile as is used by their printers? correct?
Is there anything else I'm missing here?
Is there any other benefit to embeding a color profile into an image? Like, if I email the img to someone, will the image look the same on their screen? (I assume not, because they will a) not have the screen calibrated the same way, and b) well, I'm sure there's another reason.
PPS. I did the search on this group earlier today and read a bunch of threads on this, but I"m still not clear.
Thanks in advance,
Alex

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    Ok, I finally got my MacBook Pro (first mac) got all my photos approx.7-8k worth into iPhoto. Can someone tell me what are the:
    thumb64segment.data
    thumb32segment.data
    thumbJPGsegment.data
    files and why are they in hundreds of MB, and one is ~1.5GB?
    Thanks

    Thanks toad. You might be right about the color profile, I imported all my photos into iPhoto yesterday and I had left the add colorsync profile checkbox clicked--I'm still trying to figure out exactly what it does and if I should have done that in the first place.
    As a side note, and while I have your attention (since you are so good at answering iphoto questions).
    I have a Sony V1 camera, which I assume uses the RGB or the sRGB color profile. When I get home tonight, I would like to software calibrate my monitor to 2.2 gama and 6500k white point. What else do I need to do to make sure that my photos are the same accross the board with respect to colorsync/color profile.
    I rarely print photos (never at home), usually through imagestation.com (maybe through apple's service from now on, but I doubt it). I understand that assuming these services dont discard the color profile embeded into the image file I send them, I should aim to send them the file with the same color profile as is used by their printers? correct?
    Is there anything else I'm missing here?
    Is there any other benefit to embeding a color profile into an image? Like, if I email the img to someone, will the image look the same on their screen? (I assume not, because they will a) not have the screen calibrated the same way, and b) well, I'm sure there's another reason.
    PPS. I did the search on this group earlier today and read a bunch of threads on this, but I"m still not clear.
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