private function readChunk(){
		$splits = $this->blockSize;
		
		$this->blockStart -= $splits;
		if($this->blockStart < 0){
			$splits += $this->blockStart;
			$this->blockStart = 0;
		}
		
		// Return false if nothing more to read
		if($splits === 0){
			return FALSE;
		}
		
		fseek($this->fileHandle, $this->blockStart, SEEK_SET);
		$buff = fread($this->fileHandle, $splits);

		return $buff;
	}