Question Since a windows 11 24h2 security update my lsi raid controller cannot be found

Jul 25, 2025
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Yesterday i installed a windows 11 24h2 security update. After restart my entire ls raid controller and all the attached nas drives are nowhere to be found. My computer cant simply not find the raid controller at startup. Normally i am supposed to see the loading of my lsi raid controllers bios and see detecting all the attached drives before windows starts booting. .

I have been troubleshooting for hours. I tried:

1 Uninstalling the windows 11 update No effect.
2 System restore to 2 days before no effect
3 Checked bios settings tried and untried several settings. But no effect
4 Full norton ghost restore back to windows 10 from a few months ago No effect
5 Placing lsi raid controller into another pcie express 16 slot No effect
6 Bios settings reset no effect
7 Unplugging computer and removing cmos battery for 10 minutes no effect
8 Again placing lsi raid controller back and forward between 2 pcie express 16x slots No effect

I have come to the conclusion that either something is permanently broken on my mainboard or my lsi megaraid 9260-8i controller is dead. If the raid controller is dead i am so screwed because i newer backup the data on the controller. So buying a new one and connect my curent raid 5 setup again is as far as i know not possible.

If there is someone out there who has any ideas so i can safe my data please help me.

My hardware:

Intel core i9 9900k cpu
Asrock Z390 pro4 mainboard
Lsi megaraid 9260-8i to 8 sata drives
8x Western digital red plus 14TB WD140EFGX
1x Crucial MX500 512 GB ssd
2x Corsair 32GB ddr4 2666mhz memory
 
Lsi megaraid 9260-8i to 8 sata drives
If it's an 8i, the firmware is running in IT-mode (Initiator Target) and you should be able to use pretty much any other similar card, provided it ends in -8i.
https://forums.servethehome.com/ind...and-hba-complete-listing-plus-oem-models.599/

I occasionally reflash -8e cards with IR-mode (RAID) firmware over to IT-mode, for use with TrueNAS Core. I did this to a pair of Dell H200 IR cards, but it was complicated and took some head scratching.

TrueNAS needs full access to each drive in the array using a controller card with IT firmware. I suspect your Windows 11 array is the same.

IR (RAID) firmware turns the card into "hardware" RAID and hides many drive functions from software RAID systems like TrueNAS. If you can't see the card in the BIOS, you won't be able to check if it's -8i or -8e.

I have a large collection of LSI SAS HBA controllers, all flashed to IT and with TrueNAS, it's possible to lift an entire drive array out of one PC and drop it into another. Copy a small configuration file over to the TrueNAS boot SSD in the new machine and the array works fine.

I transferred an 8-disk SAS array from an HP Xeon with ECC RAM over to an old AMD desktop CPU with non-ECC RAM. Works fine.

After restart my entire ls raid controller and all the attached nas drives are nowhere to be found.
I generally set my BIOS to UEFI with Legacy (CSM) support. I have a feeling the LSI BIOS on a 10-year old card might not be visible if Legacy (CSM) boot is switched off.

Check your BIOS and if Legacy/CSM is disabled try switching it on. Set the system to boot UEFI first for Windows 11, but with CSM enabled to reveal the LSI BIOS. You might have to disable the BIOS option which displays a logo at startup. The logo often hides the message from the LSI BIOS when it starts up, so there's no confidence check it's been detected at POST.

If you have another computer, pop the LSI card in and enable Legacy/CSM. If the card is good, you should see a brief message from the LSI BIOS as the card initilises.

As I said earlier, you'll probably be OK with pretty much any LSI IT-mode card ending in -8i, provided you had software RAID. If you had hardware RAID you may need a -8e card.

I buy ex-server pulls, preferring them to the brand new Chinese clones which predominate on eBay, Amazon and AliExpress. No good reason, but I like the genuine article.

I'm quite happy with PCIe Gen.2 cards, but you might prefer newer PCIe Gen.3. Check the Serve The Home list for Generation.
 
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