If you have "some Intel SSDs" in your system, you might have already figured out that upgrading to Windows 10 April 2018 may not be a a good call as you have gotten stuck in a boot loop or that your system crashes repeatedly. On the upside Microsoft is very aware of this and now blocking these systems from the software update. Little detail is given, but if I had to guess, the name Optane is being held back for our own safety. Thanks cageymaru. When attempting to upgrade to Window 10 April 2018 Update select devices with certain Intel SSDs may enter a UEFI screen reboot or crash repeatedly. Microsoft is currently blocking some Intel SSDs from installing the April 2018 Update due to a known incompatibility that may cause performance and stability issues. There is no workaround for this issue. If you have encountered this issue, you can roll back to Windows 10, version 1709 and wait for the resolution before attempting to install the April 2018 Update again. Microsoft is currently working on a solution that will be provided in a near future Windows Update, after which these devices will be able to install the April 2018 Update. Update: Intel is now suggesting that this only applies to Intel 600P and Pro-6000 SSD models.