What made sense years ago, really doesn’t make sense today. I don’t recommend switching out the optical drive for a second drive. The first issue is the optical bay does not offer crash guard protection so placing a HDD into the optical bay puts the data on the HDD at risk. While one might think placing a SSD in the optical bay making it the boot drive, the systems firmware in this series expects an optical drive and shuts down the power so you can encounter corruption of the drive. So it’s best not doing it.
The last point is the cost of two 512 SSD’s is more than getting a single 1TB drive and to add to it the SATA ports are serially connected to the PCH logic so you don’t get the dual I/O some people wish for that used the full bandwidth of each connected drive.
For reference this is one of the few drives that offers support for the older SATA systems Samsung 860 EVO 2.5” SSD. Note the Interface line SATA 6 Gbps Interface, compatible with SATA 3 Gbps & 1.5 Gbps interfaces. Make sure your SSD spec sheet clearly states SATA II (3.0 Gb/s) support like Samsung does here.
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First make sure the SSD you ordered will even work in your system before you open the package! Your system only offers SATA II (3.0 Gb/s) SATA ports!
Your systems specs: 15" MacBook Pro Core 2 Duo (Unibody)
Hi Dan I got it from iFixit in their upgrade system so if they've sent it to me then I hope it'll be fine otherwise it'll be going back. According to the samsung site you are correct it does run Sata 6 but is also compatible with Sata 1.5. This is all new to me so forgive me if some of it goes over my head as I would have thought that if I've given them the info why would they send out an incompatible drive to myself?