Hello   If you set the SATA mode to RAID it will enable the S130 RAID controller that is embedded in the system board. If the SATA mode is set to either ATA or AHCI then the SATA controller will act a pass-through controller. You will have no RAID options with ATA or AHCI.   If you change the mode between ATA, AHCI, or RAID then any data already written to the drives will not be accessible. If you installed the OS while the SATA mode was set to AHCI you will receive a "no boot device found" message if you change the mode to RAID. The data will not be in the proper format for the S130 to see it. Changing between the modes does not delete the data, but if you make any writes to the drives after changing the mode it will corrupt/overwrite the data. Thanks
Sorry if this is a newbie question, but I've not dealt with Dell servers a lot.  That said, I have a new T330 with 4 SATA drives installed in the first 4 bays.  In the System BIOS settings, the Embedded SATA setting currently says AHCI.  Can I mirror two of those drives (as in RAID-1) or do I need to change that to RAID?  If I select RAID, I get an warning that sounds as if the drives will be wiped/formatted/initialized in some way.  Since I already have Windows Server installed on the first drive and have data on the 3rd and 4th drives, I don't think I want to do that.  Can any experts on the T330 and its SATA settings/options provide some insight?  BTW, I've searched the Dell site quite a bit and haven't been able to find much that explains AHCI versus RAID for that setting, what changing it actually does, etc. Thanks!
T330 ACHI vs. RAID