Article ID: 000056299 Content Type: Error Messages Last Reviewed: 10/22/2021

How to Resolve Intel® Optane™ Memory Pinning Error: 'Unable to load DLL ‘iaStorAfsServiceApi.dll'' Encountered


Intel® Rapid Storage Technology (Intel® RST) driver version between 17.5.x and 17.8.x

Windows® 10, 64-bit*


Explains how to resolve the Intel® Optane™ Memory Pinning Error: Unable to load DLL ‘iaStorAfsServiceApi.dll'


After a Windows® 10 update, the following error message appears randomly during use of the system. On some systems this may also be presented as error code 0x8007007E.

Error message


Starting with the Intel RST driver, the way the Intel® Optane™ memory pinning components are installed was modified. If at some point the driver was upgraded from an older driver (for example 16.8.x) to a version between 17.5.x and 17.8.x, the OS update may try to reapply the removed installation files from the earlier versions. Due to a compatibility issue, an error message may appear. A system with factory installed (fresh OS installation) of Intel RST drivers between 17.5.x and 17.8.x are not affected by this issue.


To resolve the issue and prevent it from occurring after a future OS update, download and install the Intel® Rapid Storage Technology (Intel® RST) driver version or greater.

If unable to update to the latest or greater driver, see steps below for an alternative solution:

First, refresh the current driver package installed by repairing the Intel® Optane™ memory pinning extensions:

  1. Open Programs and Features (Press Windows key Window key + r), type appwiz.cpl and click OK.
  2. Locate and highlight Intel Optane Pinning Explorer Extensions.
  3. Click Repair.

    Click repair


Second, remove the old pinning package so that the error does not reappear after the next OS update:

  1. Open Device Manager (Press Windows key Window key + x).

    Device Manager

  2. Expand the Software components field.
  3. Right-click the Intel® Pinning Shell Extensions field and select Uninstall Device.

    Uninstall Device

  4. Check the box that states Delete the driver software for this device and click Uninstall.


Additional information

Contact Intel Customer Support for additional assistance.

If the product was bought through the OEM, contact the system manufacturer for further assistance.