1. After installing Hyper-V on Windows 10, running programs in the virtual machine frequently caused severe hard disk I/O errors. I suspected this was due to insufficient space on the C drive. Out of a total 100 GB, only 10 GB was available. See Figure 1.
2. I opened Hyper-V Manager, navigated to Action – Hyper-V Settings, and found that some settings default to the C drive. See Figure 2.
3. I decided to delete all virtual machines and then change the drive letter to the F drive. See Figure 3.
4. Based on step 2, I located the corresponding directories and deleted the relevant files: C:\Users\Public\Documents\Hyper-V and C:\ProgramData\Microsoft\Windows\Hyper-V (the deletion of this directory failed). The C drive now had 20 GB of available space. See Figure 4.
5. However, after performing the above operations, opening Hyper-V Quick Create reported that the Virtual Machine Management Service (VMMS) is not running on this computer. I suspect this is related to the deletion of C:\ProgramData\Microsoft\Windows\Hyper-V. Therefore, deleting this directory is not recommended.