Fix slow booting after changing drives in OS X
After making changes to the drive configuration in OS X you may run into an issue where the system will not boot as fast as it previously did. In these cases the system may sit at the gray boot screen for a while before the OS loads, but when it finally does, the system will otherwise run just fine.
This problem can happen after several types of drive configuration changes, which include replacing a faulty drive, upgrading the drive to a larger or faster one, or migrating to a new storage approach such as a custom Fusion Drive setup in OS X Lion or later.… Read more