My Latest Test . -> SATA TO PATA INTERCHANGE I had only 80 G.B. SATA Hard Disk withSATA DVD WRITER; this COMPAQ machine did not supported any more SATA but could have PATA HDD ; My SATA DVD WRITER went off function more than a year ago cost of PATA HDD + SATA DVD WRITER > SATA HDD + PATA DVD WRITER So i removed SATA DVD WRITER & inerted PATA DVD writer and included 500 G.B. SATA HDD - now i have 500G.B. SATA + old 80 G.B. SATA HDD