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ThinkPad T420 Hard Drive Replacement - iFixit Repair Guide
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Lenovo ThinkPad T420 14.0" Black USED Laptop - Intel Core i5 2540M 2nd Gen 2.6 GHz 8GB SODIMM DDR3 SATA 2.5" 256GB SSD DVD-RW Windows 10 Pro 64-Bit - Walmart.com