public com.google.protobuf.ByteString getDiskTypeBytes() {
      java.lang.Object ref = diskType_;
      if (ref instanceof String) {
        com.google.protobuf.ByteString b =
            com.google.protobuf.ByteString.copyFromUtf8((java.lang.String) ref);
        diskType_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
<pre>
Type of the disk (default is "pd-standard").
Valid values: "pd-ssd" (Persistent Disk Solid State Drive)
"pd-standard" (Persistent Disk Hard Disk Drive)
"pd-balanced" (Balanced Persistent Disk)
"pd-extreme" (Extreme Persistent Disk)
</pre>

<code>string disk_type = 1;</code>

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