The T420 runs on DOS Home Edition. The laptop features a 13.86 inch,HD Anti-glare Display and is powered by a 2.4 GHz with Turbo Boost Upto 3 GHz processor. To enhance multi-tasking and fast speed, the company has offered a 4 GB DDR3 RAM.
Talking about the storage, the laptop uses a 500 GB,7200 (RPM) storage.The laptop has a 6 cell battery that will give enough battery life to the users.
Please Register your Warranty: http://support.lenovo.com/us/en/contactus/basewarrantyregistration, Warranty to be Registered within 30 Days from the Date of Purchase