I was looking to expand the storage capacity of my 128 GB Macbook Air. I am running windows 10 over parallels on my MAC. Due to virtual machine in parallels only 6-7 GB storage was left on main drive and I needed additional storage to shift the virtual machine. After a lot of search on various sites I found this product. When I shifted virtual machine on this card, windows was extremely slow. However, when I reinstalled windows by erasing the older installation, it worked really fast. Now, I m really satisfied.