I went from a HDD Raid to a single SSD. It took me forever after copying the data to the SSD because through trial and error I discovered it wouldn't boot into windows on the SSD unless I left the BIOS as RAID (rather than the preferred AHCI for SSD). Much later I learned RAID supports AHCI. However, the bootup portion where windows is starting - after the bios and memory check etc. - took 1.5 minutes. It always used to take that long so I didn't complain - I just assumed it was my 7 year old motherboard. That was about a year ago, everything has been working fine, the PC still is much faster - but only once it was booted up. Then I read some articles about how to make a few registry changes to allow you to boot as AHCI. Do a search on google for updating the "StartOverride" registry settings to enable AHCI. I made two changes to the registry StartOverride key values in 2 places, then rebooted and during the bootup updated the BIOS to have the SATA storage all on AHCI. Saved the BIOS change and rebooted again and OMG! I had to shut down and turn the PC back on a few times to prove to myself I wasn't dreaming. From a cold dead start (hardware completely turned OFF) - pushing the power button to logging into windows, is now a TOTAL OF 28 SECONDS! of that 28 seconds, 22 seconds is my bios and memory checks - so now when the windows logo first appears - to when I am at the logon screen - is 6 SECONDS! Prior to this, also I kept trying to get install the Windows 10 Creators Update which is now available - and that would always fail. I tried this again when running as AHCI - and the update was successful (although it did take about a half an hour with many reboots (FAST REBOOTS NOW MAY I ADD!) - the update makes major changes to the OS). Now I have to say this is the fastest, most stable I have ever seen ANY PC running Windows. (And I work in IT.) So going from RAID in the BIOS with only one SSD - and a 2 minute boot time from a cold start to windows login - to AHCI in BIOS and a 28 second boot time from a cold start to windows login - ON A 7 YEAR OLD PC - magnificent!