I have a MacBook Pro that I bought around 2011. How do I know what level of SATA the internal hard drive interface supports?
This is the About This Mac:
And this is what the SATA section of the System Report looks like.
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You can take a look at the Link Speed under the Intel 5 Series Chipset section. SATA levels are named after a number (1, 2, 3) and also for their speeds.
"Link speeds are the theoretical maximum speed at which data can transfer to or from those devices." - Taken from here.
The "Negotiated Link Speed" is what you currently have, in your case, this is SATA 2.0 too…
Here is a link with a description of the different SATA revisions