public Builder clearDiskType() {
          diskType_ = getDefaultInstance().getDiskType();
          bitField0_ = (bitField0_ & ~0x00000004);
          onChanged();
          return this;
        }
<pre>
Optional. The [type of the persistent
disk](https://cloud.google.com/compute/docs/disks#disk-types) for the
home directory. Defaults to `"pd-standard"`.
</pre>

<code>string disk_type = 3 [(.google.api.field_behavior) = OPTIONAL];</code>

@return This builder for chaining.
java-workstations/proto-google-cloud-workstations-v1/src/main/java/com/google/cloud/workstations/v1/WorkstationConfig.java