You mean when you had just the writer... it was set to slave... i don't think you can set any drive to slave if you don't have anyone else set to master!! I have experienced this one!
It must be set to secondary master!
Then if you want to set he DVDROM to sec. slave. then set the jumper for the slave... the jumper settings are printed on the drive itself! So, don't worry!
Also, if you want to set it to slave... you can just simply remove the jumper and connect it to the PC!! Mine is working like that only!
But IFF, you want ur DVDROM to be master and ur RW to be slave... you HAVE to set the ROM to Master and then do anything EXCPET master to the RW!!!
I don't think I m at all worng ... coz... evrything is what have tried myself!!!!