Crucial is sending out larger SSDs than ordered (accidentally?)! Ordered a 128GB and got a 256GB. Chat with Amazon confirmed it is widespread! : r/pcmasterrace
Crucial M550 128GB SATA M.2 Type 2280 Internal Solid State Drive CT128M550SSD4 : Electronics - Amazon.com
Crucial M550 SSD Review (1TB) - Increased Speed, Capacity and Value | The SSD Review
Amazon.com: (OLD MODEL) Crucial M550 256GB SATA 2.5" 7mm (with 9.5mm adapter) Internal Solid State Drive - CT256M550SSD1 : Electronics
Crucial M550 Review: 128GB, 256GB, 512GB and 1TB Models Tested