It seems to me that both computers Dell Insprion 620/Vostro 260 does not have any kind of settings for AHCI mode in BIOS. I have looked all over for it and there does not seem to be anything related to AHCI. Furthermore there is no way I can update the BIOS without INTEL Management Drivers. The device manager is also showing that ATA drivers not using AHCI drivers. Also it does not show INTEL RST drivers installed. I tried the Bios version A04 but this made no difference.
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