100MB is EFI, next 900MB I agree with you is likely OEM but is there also some 20GB recovery? That 450MB is from upgrade to 10 but why wasn't automatically deleted that 900MB partition when are here...

All in red circles are recovery partitiones.

And here is my https://www.tenforums.com/attachments/windows-10-news/48189d1447539935-first-major-update-windows-10-available-today-bez-nazvu.jpg

Yes I upgrade from 8.1 to 10 (10240) none 450MB partition created. Now I upgraded to 10586 and it's in Disk management, strange...

Ah OK, I also have 900MB that is maybe from Windows 8.1 and now 450MB from Win10?

I asked because when I did clean install in July of build 10240 this partition wasn't automatically created.

Is here someone who did clean install of this new build 10586 and during installation deleted all partitions but after finish of clean installation have in Disk management partition with 450MB?

And another question in build 10240 booted first logo, than black screen and login and now in 10586.3 is logo, than monitor decreases brightness, again logo and then login :D You have that too? :D

48189Look guys 100MB is EFI I think and others are recovery?? Too much? :D

And it's needed for something? Because I can't delete it :/

Hello all!

I have this same issue, someone knows what is it?