How to check which partition is active using cmd? Is possible to use the diskaprt command in check which partition is active?

I suppose Diskpart would tell you, but here is a simpler, graphical way. Right-click Computer, clicking Manage > Storage > Disk Management. The drive that is labelled as System is where the boot files are stored. It is where the initial booting starts from and, if you're multi-booting, it produces a list of operating systems on the screen. The operating system you boot to will be labelled as Boot, Crash Dump and Page File and is given the drive letter C, which is not necessarily the System drive, i.e. youre not necessarily booting to the System drive where the boot files are located. Also, the Page File could have been disabled or moved to a different drive to, say, alleviate disk space problems. The first installed disk is numbered as disk 0 (zero) and the next one is 1 (one), etc. however, partitions are numbered from 1 (one) onwards. If you have a pre-installed version of Windows, you may have partitions without drive letters and a manufacturers recovery partition. These can be disregarded in terms of booting. A single Windows installation will contain six attributes: Primary, System, Active, Boot, Page File and Crash Dump, although the Page File could have been disabled or moved as I said above.