and the SATA DVD Writer is also set as a Master
No.
SATA devices do not use Master, Slave or Cable Select. Those are only for IDE devices. This is because you can connect two devices to each IDE cable and the IDE interface controller must be able to determine which is which. SATA only supports one device per cable so the SATA controller does not need to sort that out. In the vast majority of cases, you never have to mess with jumpers on SATA drives - especially those made in recent years.
With IDE devices, you have a two main options with strict rules:
Option 1 - Cable Select (CS). Both drives (or one if only one drive is used) will be set (by jumper) to CS. The IDE HD controller will determine which is Master (MA)...