Well, the card comes with a mini-disk, which I immediately threw in the trash before realizing that the firmware was going to be so hard to find on the internet. After reading some of the comments here, I was able to find the correct firmware called "MAGNI Family Driver 1.2.0.1041" by searching for "Marvell 88SE91xx/88SE92xx SATA Driver". The card installed without any problems and after installing the correct firmware it worked. To the right. Previously, the BIOS would show random disks on each reboot (only 2 disks were available at a time). Also, I bought the SATA cables separately (they seem pretty cheap) and the card works as expected. I gave 3 stars because the drivers were not automatically installed by windows and there is no website where you can easily find the firmware.
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