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 Why does the message "VDH002" appear when I hold down the D key for detection during startup? How are SLC (Single-Level Cell), MLC (Multi-Level Cell) and TLC (Triple-Level Cell) Flash different from one another? Why can't I wake my JetDrive 850 up from Hibernation Mode? Technical Support If the answer can't help you, you can contact the Tech Support Department Get Started