@java.lang.Override
  public java.lang.String getBootDiskType() {
    java.lang.Object ref = bootDiskType_;
    if (ref instanceof java.lang.String) {
      return (java.lang.String) ref;
    } else {
      com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
      java.lang.String s = bs.toStringUtf8();
      bootDiskType_ = s;
      return s;
    }
  }
<pre>
Type of the boot disk (default is "pd-ssd").
Valid values: "pd-ssd" (Persistent Disk Solid State Drive) or
"pd-standard" (Persistent Disk Hard Disk Drive).
</pre>

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

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