Check out CDR Info on How to make your 1213s single layer DVD writer into a 1633s dual layer writer that works at 16x +R writing speed and 2.4X DL writing.

Note that first you should backup your firmware with LTNFlash (included at the RAR file) and afterwards flash with the SONY firmware, your drive will be named as DRU-710A but of course you can go back with the backup firmware

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Jason.