public function isRecordNameAChunk($recordName)
    {
        $posAppendix = $this->getEndPosOfChunkAppendix($recordName);

        if (false === $posAppendix) {
            return false;
        }

        // will contain "0_99" of "chunk_0_99"
        $blobId = substr($recordName, $posAppendix);

        return $this->isChunkRange($blobId);
    }