I have a Mid 2007 20-inch iMac Core 2 Duo with a PATA optical disk drive (MAT****ADVD-R UJ-85J) and and a SATA 3Gb/s hard disk drive. Seeming the SATA revision only hits 3Gb/s I think it is a waste to put in any SSD drive, or am I wrong? As an alternative I was thinking of sticking either a WD RE or Black HDD with 4TB. Either drive would be able to deliver at least 150MB/s. For the PATA optical bay perhaps a HDD caddy that connects 2.5-inch SATA HDD to PATA connections. But then again, why bother? Your thoughts are most welcome.