Sony RDR-HX910

[qanda]This question is published in the hardware section for the Sony RDR-HX910. Click here to view full specs.[/qanda]Hi I have the other Sony RDR-HX900 witch only records on single layer disk. I would like to replace the HHD with Dual Layer recording ability that the Sony RDR-HX910 have… Does any body have the knowledge of replacing the HHD from one to the other (dual layer)…thanks for the help…