I have a Dell Precision T7500.
In BIOS I have turned off the SAS controller, which means that I can't use two HD's and the DVD drive, which I am fine with.
I have an Adata SU800 SSD in it, which I assume is connected to a SATA connector.
Can I somehow disconnect the SAS controller physically? I'm asking as it takes 30 seconds of black screen time before the Dell screen appears when I hit the power switch. I think it might be faster if I unplug the SAS, but can' work out which part it is and am scared of breaking something.
The following screenshot shows what happens when I enable the SAS controller. It takes about 30 seconds to initialize, during which it detects 2 SAS hard drives and 1 DVD drive.
The following screenshot shows where I turned it off in the BIOS settings: