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Return of Blue Screen Pointing to iaStorB; how to troubleshoot?

Last Modified: 2018-09-24
I closed another question prematurely. The link for that question is https://www.experts-exchange.com/questions/29118197/Occasional-Blue-Screen-Pointing-to-iaStorB-how-to-troubleshoot.html 

The problem is recurring crashes of Windows 10 Pro 64-bit with an indication that the problem is from iaStorB.sys. System ran fine for a few days until this evening when the same type crash occurred. As in the past I was able to reboot normally.

As you will see in the earlier question the system has two internal SK Hynix 1TB SSD drives. They are NOT configured in RAID.

In the previous thread I was guided to change in BIOS setup the HDD operation from RAID to SATA. I also uninstalled the Intel Rapid Storage Technology enterprise software.

I gather since the new crash still points to iastorb.sys that it is still active in the system. Here is the text of the critical event from the Windows log:

The computer has rebooted from a bugcheck.  The bugcheck was: 0x000000d1 (0x0000000000000008, 0x0000000000000002, 0x0000000000000000, 0xfffff80a48a47218). A dump was saved in: C:\WINDOWS\MEMORY.DMP. Report Id: b4b9a29b-196e-4683-95a3-f0b309187536.

A mini-dump file is also attached.

I ran sfc /scannow - no problems found. Just a couple days ago I ran the full self test on the SSDs and they completed with no errors.

Any further insights on what to try?

Thanks, Pete
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Simple Geek from the '70s
Distinguished Expert 2019
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Peter ByeRetired


I'd like to check a couple things before uninstalling that driver, to be sure I don't make the computer unbootable.

In Device Manager under Storage Controllers, before showing hidden devices, I see:

Intel C600+/C220+ series chipset sSATA AHCI Controller

- From driver details I now see this is iaStorB.sys
- status is that it is working normally

Also present are:
- Microsoft Storage Space Controller
- Standard NVM Express Controller
- Standard NVM Express Controller (2, for the 2 nvme M.2 SSDs)
- USB Attached SCSI (UAS) Mass Storage Device


After clicking to show hidden devices, I also see:

Intel C600+/C220+ series chipset SATA RAID Controller

- From driver details I now see this is iaStorA.sys
- The status is disconnected from computer

So, even though iaStorB.sys is the AHCI controller and the BIOS is set for AHCI operation, is it accurate that I still do not need that iaStorB.sys driver since the two SSD drives are controlled by the NVM Express Controller?

Can I also safely uninstall the RAID controller (iaStorA.sys) since I do not use any RAID configuration?

Thanks, Pete
David Johnson, CDSimple Geek from the '70s
Distinguished Expert 2019

they aren't being used since you don't have any drives connected to the SATA ports on the motherboard.
The one that is dimmed is definitely not being used it is an orphan (it can be removed safely)
If windows need a device driver it will load the driver from the driverstore
Peter ByeRetired


Thanks very much, David. Your further explanation was very helpful. I've uninstalled both Intel drivers (RAID and AHCI). Hopefully no more BSODs, at least none due to iaStorB.

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