无损读出 meaning in Chinese

non destructive reading
nondestructive readout

While many parts of this technology have made good progress ( such as increasing data storage density , reducing access time , improving performances of photorefractive memories , and the like ) , the volatility of the stored data in photorefractive materials has become serious obstacle to the practical realization of photorefractive holographic memories
近年来，在提高数据存储密度、存取速度以及存储器性能等方面，已经取得了重大的研究进展。光折变晶体中的非易失性存储(长期保存和无损读出)问题，已成为高密度全息存储技术能否实用化的关键问题之一。