I am considering getting a MBP 13 and replacing the Superdrive with an OWC SSD drive. This would allow me to have two drives, but I'm wondering about the battery impact.
Assuming I keep the HDD in the original place is there a way to spin down the HDD to save battery power?
Drives in the original HDD slot won't be able to sleep, even if you boot off another drive.
I just put an Optibay in my 15", put the original hard drive into the Optibay, and then put an OCZ Vertex 2 into the original hard drive slot. Battery life seems as if it wasn't as good as before, but I think it's only trimmed 30-60 min, which isn't that bad since these new Pro's have a 8ish hour battery to begin with.