Though we allocate an estimated/expected size of disk for both System Drive or Data drive, we do get into situations where we need to expand the disks. In this article let us look at how to expand disk on Windows Machine.
To expand/reduce a disk VM should be in Stopped(deallocated) state.
When we provision a Windows machine on Azure the default size allocated to System Drive (C drive) is 127 GB. Azure not allow a reduction of system volume size below 127 GB. Below is the error you see when you try to reduce the System volume size below 127 GB.