public static Builder newBuilder() {
    return DEFAULT_INSTANCE.toBuilder();
  }
<pre>
Size in GB of the disk (default is 100GB).
</pre>

<code>int64 disk_size_gb = 2;</code>

@return The diskSizeGb.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/PersistentDiskSpec.java