New CentOS 6.2 install detects /dev/mapper/ddf1*** device - how to remove ?

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https://www.centos.org – Hi guysI'm trying to install CentOS 6.2 64bit on a 4x 60GB ssd disk setup in software raid 10 or 0 but when i load CentOS 6.2 64bit dvd1 to install, when it comes to disk partition... [by p4guru] (Distributions)