Microsoft has confirmed that the upcoming May 2019 update will not work on some Windows 10 based computers. The new update will not work on computers with an external USB device or SD memory card attached.

 

The latest Windows 10 support document reveals that computers operating on the April 2018 or October 2018 updates will get an error message. It will read, “This PC can’t be upgraded to Windows 10.”

 

This is so because the computer hardware is currently not certified ready for the new update. Microsoft further explained that the update will proceed automatically upon resolution of the problem.

 

Microsoft is then suggesting the removal of external media, USB devices and SD cards before starting the installation process.

 

This is because the new update suffers from a problem where drivers can be inappropriately reassigned different letters of the USB devices or SD cards connected to the PC. Windows already gives every driver attached to a computer its own unique letter.

 

 

It is possible that after implementing the May 2019 Update, it can cause side effects resulting from a change in the drive letters.

 

In the support document, Microsoft explains,

“Before the upgrade, the device would have been mounted in the system as drive G based on the existing drive configuration. However, after the upgrade, the device is reassigned a different drive letter. For example, the drive is reassigned as drive H.”

 

This reassignment with the update can also affect internal hard drives too. This can cause potential damage when searching for files from the PC because of the reassigned letter in its name. Before trying to install the May 2019 Update, remove all external devices and cards and restart the PC,

 

The problem is however unlikely to occur when there are no plugged-in external devices. Microsoft is looking to solve the problem before it rolls out the full update to the public.