Start up disk space

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I keep getting a message lately that says my Start Up disk is almost full and that I need to delete some of my files. What does this mean exactly and how do I perform this task. I noticed this has started as I have been using iMovie lately if that helps at all. Thanks.
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On the Desktop, click on your Hard Drives icon, do a Get Info and it will tell you the amount used & amount of free space.
You need to keep at least 20%+ of it free for best operation.
You need to move some stuff off to another HDD or CDs/DVDs.
How much free space is on the HD, where has all the space gone?
WhatSize...
http://www.macupdate.com/info.php/id/13006/
Disk Inventory X...
http://www.derlien.com/
GrandPerspective...
http://grandperspectiv.sourceforge.net/
The issue will be more complicated i you're using Filevault.
Please ask if you need more help or have questions.