Start Up Disc Full - Different from full hard drive?

Hi,
I have a mac book pro...one of the older models...around 5 or 6 years old..the silver one with the silver around the screen part. Running Mac OS X 10.6.8,
2.33 GHz, 2GB ram.
Lately my computer has been rediculously slow with everything, but aside from that my issue is with my start up disc. I would have over 1.5 GB of space left, open up a photoshop file...make some alterations and save...and all of a sudden I have NO SPACE left. These alterations created the photoshop file to be like 50mb more. Its a 200mb file. So how can I go from 1.5 gigs to saving a 200mb .psd file and all of a sudden 0 hd space?
Sometimes I couldnt even save the .psd because when I opened it all of a sudden I have half a gig now. And even if I had half a gig why wouldnt I be able to save? I go to save and sometimes it says "your start up disc us full" - Is this different than my harddrive?
What am I missing here? Is photoshop using some sort of weird caching thing?

Hi...
I would have over 1.5 GB of space left,
Definitely not enough free disk space. You are lucky your Mac even boots.
Right or control click the MacintoshHD icon on your Desktop.
Click Get Info. In the Get Info window you will see Capacity and Available. Make sure there's a minimum of 15% free disk space.
OSX Tips Where did my Disk Space go?
Freeing Up Hard Disk Space - Mac GuidesFreeing Up Hard Disk Space - Mac Guides
Anytime you edit a file in Photoshop, that decreases disk space.

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