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Mainly because of Trojans/scripts that can be executed that would utilize your ROOT/GOD access to do harm on your computer. As far as OSX, the threat is very minimal but Windows machines need to be a little more careful.

is the jump from 1gb to 2gb significant?
if i was gonna do any upgrading, it would be hard drive 80gb to 120gb

(note- on an 80gb macbook, after os x and maybe neooffice, how much free space am i likely to have?)

cheers

That boost in memory can and will enhance your experience when using Graphic programs, web dev programs, and/or gaming. Also it will make some other things a little more snappy like OS X. However, if you download a lot of music, photos and use VM (virtual Machines) HDD space becomes a requirement.

So you have to weigh your needs and wants. Do I need more space because I download tons of photos and music? Or, do I use Photoshop and/or Dreamweaver and game a little, more RAM would be required.
 
That boost in memory can and will enhance your experience when using Graphic programs, web dev programs, and/or gaming. Also it will make some other things a little more snappy like OS X. However, if you download a lot of music, photos and use VM (virtual Machines) HDD space becomes a requirement.

So you have to weigh your needs and wants. Do I need more space because I download tons of photos and music? Or, do I use Photoshop and/or Dreamweaver and game a little, more RAM would be required.

i hava a music collection just over 60gb in size, currently stored on a usb hdd (80gb). depending on how much space the os takes, i maybe be able to fit it on the main hard drive, but i'm guessing there probably is not enough room.
 
On an 80 gig HDD, you'll probably have roughly 30-40 gigs of space to play with once you've installed your basic programs.

I'm using a MBP, so this advice may not be applicable, but when I chose what to upgrade, I went for the HDD, because the ram was so much easier for me to replace myself. On a MB, however, both shouldn't be bad.
 
On an 80 gig HDD, you'll probably have roughly 30-40 gigs of space to play with once you've installed your basic programs.

I'm using a MBP, so this advice may not be applicable, but when I chose what to upgrade, I went for the HDD, because the ram was so much easier for me to replace myself. On a MB, however, both shouldn't be bad.

You're pretty much on the dot. I installed a few widgets/apps last night. Transferred a few songs/pictures and have about 50GB free. I was able to free up about 1.6GB giving me about 58GB from the beginning but I'm planning on getting the 160GB Hitachi soon.
 
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