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DBAN wipes (erases, deletes) almost all the info in your HDD.
When you say you have a recovery disc, if you mean that you have a Sony CD for factory reset / recovery, then that is what you are supposed to use. Boot with it inserted and select the CD drive to use as boot drive.
If your system needs a recovery "partition" (which is part of the HDD), I can only *guess* that you have also wiped that "recovery" partition too. This guess might be wrong though.
Probably consulting the Sony Vaio website, you'll find a knowledgebase, FAQs, and so on.
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