Last 2013, one month after my apple warranty expired, the internal SSD in my macbook air completely died with no files recoverable whatsoever (a few weeks after that apple released a fix for the SSD dying, too late for me though). At the time, the cost of the internal SSD was too much for me to have replaced. So ever since, I have been running my entire OS on an external hard drive. My mac literally won't function unless the external hard drive is connected to it because all the software including the OS is inside the external hard drive, severely hampering the "portability" of my mac. Now, Three years after buying this mac I feel like I don't want to replace it anymore rather, I want to replace the internal SSD inside myself and use it again like what I bought it for, portability. However, I don't know where I can get a good quality internal SSD for my mac since it is after all three years old now. I was wondering if you guys can make a suggestion?