A couple pages talk of getting 1/2 that if you run on a PCI 3 machine. The SN850 is a PCIe 4 and is advertised as seq read / write as 7,000 / 5,100. Updated that and still got the same basic number as AHCI. I installed the WD dashboard and it said the firmware was out of date. Was hoping to see big gains, but oh well. I ran Crystal DiskMark with default settings (other than changed tests from 5 to 1), before and got I followed the steps above changing BIOS from RAID to AHCI.

Reboot once more and Windows will automatically start with AHCI drivers enabled. Type this command and press ENTER: bcdedit /set safeboot (ALT: bcdedit /deletevalue safeboot) Right-click the result and select Run as administrator Here are the steps:Click the Start Button and type cmd There is in fact a way to switch operation from either IDE / RAID to AHCI within Windows 10 without having to reinstall. SSD drives typically perform better using AHCI drivers. Some systems will have the Windows operating system installed using RAID drivers including the Intel Rapid Storage Technology. So this is a way to set to AHCI so that most OS can see the HDD or SSDs (especially for changing SSD or cloning. 2300peterw you don't think iRST is needed for single drive setups (most all that I use / I always thought I should have it).īy default, most major manufacturer always set the SSD or HDD to RAID even if there is only 1 SSD or HDD. I tried reading these, but my eyes glaze over. Would you expect if I changed it from RAID / IRST to the other choice, when I clone the original drive to the 1TB drive, that the 1TB won't be bootable? The original drive was configured based on the bios being raid / IRST? I didn't want to rock the boat too much.

Which matches what 2300peterw and adrian_ych mention.īut out of the box / from the factory, Dell (who I hope knows better than me?) had the raid / irst box checked? Or they have bios defaulted to raid / iRST for all machines for consistency? Some machines ship with 2 SSDs / Raid, some don't?

I forget the one that wasn't checked, but the one that was checked talked about RAID and how Intel RST needs this box checked. I did see a couple radio buttons in bios related to storage. I did happen to poke around the BIOS when I started this - or at least when the USB app didn't see the internal drive.

Dell 5420 driver