@java.lang.Override
        public Builder mergeFrom(com.google.protobuf.Message other) {
          if (other
              instanceof
              com.google.cloud.workstations.v1beta.WorkstationConfig.EphemeralDirectory
                  .GcePersistentDisk) {
            return mergeFrom(
                (com.google.cloud.workstations.v1beta.WorkstationConfig.EphemeralDirectory
                        .GcePersistentDisk)
                    other);
          } else {
            super.mergeFrom(other);
            return this;
          }
        }
<pre>
An EphemeralDirectory is backed by a Compute Engine persistent disk.
</pre>

Protobuf type {@code
google.cloud.workstations.v1beta.WorkstationConfig.EphemeralDirectory.GcePersistentDisk}
java-workstations/proto-google-cloud-workstations-v1beta/src/main/java/com/google/cloud/workstations/v1beta/WorkstationConfig.java