Is the recovery volume set as Continuous or On Request mode?
It might also be related to the amount of free space.
Another option would be accessing the Intel® RAID option ROM by pressing Ctrl + I during system POST and reset the disks to non-RAID. The data will stay as long as this is a RAID 1 or a fully synchronized recovery volume; remember there is a Continuous and On Request mode. The data on RAID 0 will be lost after resetting to non-RAID so a back up is always needed.
In any case we recommend creating a backup as fail-safe measure.
In order to open the Intel® RAID Option ROM all the below conditions must be fulfilled:
- The SATA controller is set to RAID mode in BIOS.
- Two or more drives connected to the Intel® SATA controller.
- Press Ctrl + I at the right moment during POST, before the operating system starts loading. You may press the keys repeatedly multiple times as soon as you turn the system on.
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As above, SATA controller was set to RAID mode in BIOS and two drives were connected to the SATA controller, however Ctrl + I during POST did not open Intel RAID Option ROM.
This was resolved by following actions in BIOS:
- disabling Secure Boot Mode
- enabling Legacy Option ROMS
Once this was done, Ctrl + I opened Intel RAID Option ROM, and the disks were successfully reset to non-RAID.