WHM&cPanel Disk Used shows Incorrect Values

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http://forums.cpanel.net – Hello. I have a problem on my VPS with Disk Used space counting in WHM and cPanel. For example user has disk quota 1000MB, but WHM counts 4967MB, which is not correct. In cPanel i see that this 4GB is in Other Files. First question is - How I can see this "other files" without finding them bymyself with find -u username, which utility cPanel uses to find this files and which utility it uses to count disk used by this "other files"? Its already three questions :). Next. I have found that this is common problem. I google it and found some solutions how to fix quot (HowTos)