You can find more specs detail for this model from Apple's support site. TarDisk is around 95MB/s write, 90MB/s read. Note the TarDisk model is specifically designed for this MBP model to fit the SD slot perfectly. You can find more details about this TarDisk model on Amazon.
I'm providing real recent photo of this laptop, and it's the honest photos so you don't need to worry about anything hiding from you. The item "Highest Config MacBook Pro 15 (mid-2012) i7 2.7G/16G/512G SSD + 246G TarDisk" is in sale since Tuesday, April 24, 2018. This item is in the category "Computers/Tablets & Networking\Laptops & Netbooks\Apple Laptops".The seller is "feng-bowen" and is located in New York, New York. This item can be shipped to United States.