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I actually have Lenovo thinkpad x230t convertible laptop, what specification (of ssd) should i be looking for to install a new ssd into my laptop?

adwaitgaikwad your X230T uses an Intel® SSD 520 Series Form Factor is 2.5" 7mm and the Interface is a SATA 3.0 6Gb/S. Those are the definite specs you need to replace your SSD.