"Mirrors" folder in my Library - What is this for?

Hello. In my Library there is a folder called "Mirrors" (~/Library/Mirrors). It contains a .dmg file that is almost 16GB is size. Not an issue on my PowerBook, but on my older G3 iMac it is almost half the hard drive space. Does any one know what this file is and if it can be trimmed down?
Thanks in advance!

Could be corrution.
How much free space is on the HD, where has all the space gone?
OmniDiskSweeper is likely the easiest/best, and is now free...
http://www.omnigroup.com/applications/omnidisksweeper/download/

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"Mirrors" folder in my Library - What is this for?

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