Erasing cache question

i am using a great program, 'WhatSize' and deleting things from my HD i do not need. surprisingly, i have found quite a lot to erase which is unnecessary. i found a folder called 'caches'. and within this folder are many other folders like Quicktime, Safari, Desktop, etc. is it ok to erase the contents within these folders? if so, what are these contents anyway? thanks.

Hi
Here is a general look at freeing up disk space by Dr Smoke.
http://www.thexlab.com/faqs/freeingspace.html
Computers cache information to make the system run quicker. This occurs from within the CPU to application files on the Hard Disk. Generally caching works well but there are times when you may need to delete cached information to free up disk space.
In the folder you are looking at, ~/Library/Cache some folders can be deleted without penalty. To free up space you can safely delete:
all sub folders beneath com.apple.SoftwareUpdate.
also the Quicktime cache can be deleted (not the foldername Quicktime, just what is in that folder.)
Do not delete the cached information under Desktop.
Other cached information can be deleted from within the application, for example Safari has the option to Empty Cache under its main menu, and Firefox can empty the cache whenever it is closed. That is found under Firefox Preferences.
Also, look at the console.log to see if it a small size (several KB only). This is located in
HD/Library/Logs/Console/yourUserName/console.log.
regards roam

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