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how can i erase the recovery part of 7GB from my vaio?thank you
Hi giannis_mgr
If you remove the recovery partition be aware that if you have a CD/DVD drive problem or your recovery disc get lost or damaged, then you won't be able to use the recovery partition to restore your Vaio..
If you are sure you want to remove the recovery partition, make sure you create and TEST a couple recovery disc sets before you remove the recovery partition.. 
Here is Sony's official guide , there are also third party programs such as Paragon Partition Manager ..