The disclosure herein describes installing operating system (OS) software on a computing device with multiple drives. An interruption process associated with a redundant drive array is initiated by a processor. The redundant drive array includes a primary drive mirrored with a backup drive. An installation process associated with the operating system to be installed on the computing device is initiated by the processor. Upon detecting creation of a file system during the installation process, the interruption process disables the backup drive from the redundant drive array. Upon completion of the installation of the operating system on the primary drive by the installation process, the backup drive is re-enabled in the redundant drive array. After being re-enabled, the backup drive is synchronized with the primary drive. The installation process is made faster and more efficient by preventing repeated synchronization between the redundant drives during the process.