Why can't i write data to blu-ray disc media – Sony VAIO VPCF12 Series User Manual

VPCF12LGX, VPCF121GX, VPCF12HFX, VPCF12YFX, VPCF12FFX, VPCF12MGX, VPCF12PGX, VPCF1290X, VPCF123FX, VPCF12GFX, VPCF12CFX, VPCF12DFX, VPCF12JFX, VPCF12LFX, VPCF12KFX, VPCF12VGX, VPCF125FX, VPCF12THX, VPCF121FX, VPCF122FX, VPCF127FX, VPCF12SGX, VPCF12RGX, VPCF12ZFX, VPCF12XHX, VPCF12QGX, VPCF12BFX, VPCF126FM, VPCF12NGX, VPCF12AFM, VPCF12UGX