GET64D
sd->sd_size = (off_t)GET64D(pdmeta, vdc1->Block_Count) * 512;
GET64D(meta, vdc->Block_Count));
GET64D(meta, vdc->VD_Size));
GET64D(meta, vdc->Cache_Flags));
end1 = beg1 + GET64D(meta, vdc->Block_Count);