jhaddix

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chenxiaolong

Switching between AHCI and RAID on the Dell XPS 15 (9560)

This guide likely applies to other models and, potentially, even laptops from other OEMs that have NVME drives. However, I've only tested this on my Dell XPS 15 (9560) with the OEM Windows installation from the Signature Edition model.

Switching from RAID to AHCI

Switching from RAID to AHCI is significantly simpler than switching from AHCI to RAID. All that's needed is a successful boot to Safe Mode.

1. To set the default boot mode to Safe Mode, use msconfig.exe or open an admin cmd/PowerShell window and run:

thoferon

CREATE TYPE _weighted_avg_fraction
  AS (num double precision, denom double precision);

CREATE OR REPLACE FUNCTION _weighted_avg_step (acc _weighted_avg_fraction,
    val anyelement, pond anyelement) RETURNS _weighted_avg_fraction AS $$
BEGIN
  RETURN (acc.num + val * pond, acc.denom + pond);
END;
$$ LANGUAGE plpgsql;