Why does my Mac computer take longer to boot after I upgraded it with JetDrive SSD? Category : Setup / Operation After upgrading your Mac with JetDrive SSD, please reset the "Start up Disk" by the following steps:1. Find "System Preferences"2. Click "Start up Disk"3. Unlock and set the disk you would like to use as start up disk 4. Reboot Is the answer helpful? Related Differences between JetDrive 825 and JetDrive 820. Is a static-free environment required when I swap the JDM (SSD)? Should I purchase a Jetdrive with larger capacity than the original Mac SSD/HDD if I want to clone the system with Disk Utility? Technical Support If the answer can't help you, you can contact the Tech Support Department Get Started