Win8.1 compressed volume can only be compressed half how to do

Analysis of the cause: The software or patch may be installed, causing the system to create a restore point, which causes the compressed volume function to compress only the space available in the second half.
Workaround:
1. When this fault occurs, first turn off the system protection function and delete the restore point.
The specific method is as follows:
1) Enter the system properties and find the system protection. Figure:

2) select the configuration, turn off system protection, and select a restore point, as before Delete Delete:


2. finish disable and delete restore points after System Protection If the C drive still cannot be compressed, it is recommended that you back up the data and restore the system with one click.