Mini telling me to delete files on startup disk

A screen started popping up last night telling me to close all my applications to create more space and that I needed to delete files off of my startup disk because it is too full. I'm not sure what files to delete, and/or, if I should even pay attention to this notice.... Help!
Also, I was only running Safari when the notice came up. It happened twice last night and once this morning.

If your computer is locking up and if you have been running out of room on your hard drive, you should make sure your hard drive has not suffered some corruption by running Utilities > DiskUtility and verifying the hard drive.
BTW you should try to keep 10% of your hard drive free space, for better performance. And if you can't do that, at least keep 2 Gigbytes or more free. (OSX gets very unhappy when it runs out of room -- and bad things start to happen.)

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    Open Finder and look on the sidebar for the House Icon:
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    Hello Smile_333
    The article below will assist with finding things and help increase the hard drive space for your computer. The best way is to have an external hard drive to copy things to if you do not want to delete and loose things.
    OS X Mountain Lion: Increase disk space
    http://support.apple.com/kb/PH10677
    Thanks for using Apple Support Communities.
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    /Volumes/Cruzer/Terminal Saved Output: line 4: 1:: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 5: 2:: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 6: 3:: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 7: /dev/disk1: Permission denied
    /Volumes/Cruzer/Terminal Saved Output: line 9: 0:: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 10: 1:: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 11: 2:: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 12: /dev/disk2: Permission denied
    /Volumes/Cruzer/Terminal Saved Output: line 14: 0:: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 15: Logical: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 16: 5843C88A-1AEE-455B-AA12-1B9017FBE610: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 17: Unencrypted: command not found
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    /Volumes/Cruzer/Terminal Saved Output: line 20: 0:: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 21: /dev/disk4: No such file or directory
    /Volumes/Cruzer/Terminal Saved Output: line 23: 0:: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 24: /dev/disk5: No such file or directory
    /Volumes/Cruzer/Terminal Saved Output: line 26: 0:: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 27: /dev/disk6: No such file or directory
    /Volumes/Cruzer/Terminal Saved Output: line 29: 0:: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 30: /dev/disk7: No such file or directory
    /Volumes/Cruzer/Terminal Saved Output: line 32: 0:: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 33: /dev/disk8: No such file or directory
    /Volumes/Cruzer/Terminal Saved Output: line 35: 0:: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 36: /dev/disk9: No such file or directory
    /Volumes/Cruzer/Terminal Saved Output: line 38: 0:: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 39: /dev/disk10: No such file or directory
    /Volumes/Cruzer/Terminal Saved Output: line 41: 0:: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 42: /dev/disk11: No such file or directory
    /Volumes/Cruzer/Terminal Saved Output: line 44: 0:: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 45: /dev/disk12: No such file or directory
    /Volumes/Cruzer/Terminal Saved Output: line 47: 0:: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 48: /dev/disk13: No such file or directory
    /Volumes/Cruzer/Terminal Saved Output: line 50: 0:: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 51: /dev/disk14: No such file or directory
    /Volumes/Cruzer/Terminal Saved Output: line 53: 0:: command not found
    /Volumes/Cruzer/Terminal Saved Output: line 54: /dev/disk15: No such file or directory
    /Volumes/Cruzer/Terminal Saved Output: line 56: 0:: command not found
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    logout
    [Process completed]

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