Disks switching between Basic Hard Disk 0 and 1 My system consist of two hard drives, in Slot 0 I have the system partition and two other partitions, in slot 1 I have my large backup drive with only one partition. From time to time and today after installing windows update and restating the computer, the slot assignment changed with the backup drive disk moving to slot 0 and system drive disk to slot 1, this masses up my backup scrips because they are setup to backup slot 0 partition 0 and so on. In-order to put the disks back into the correct slots I have to update the MBR in the system disk slot and restart the computer. Is there a way to lock system drive disk into slot 0 and if not, is there a way to writ the backup script to backup by drive letter instate of partition location. My Paragon Backup program is Backup & Recovery 10 Home and my system is Windows 7 64bit, the SATA controller in set to AHCI.