Secondary Storage Device，与备份或归档来自主存储的存储服务器相连的辅助存储设备。如硬盘，光碟或其他速度缓慢但拥有很高容量的设备。
数据采集系统是用于获得数据处理和存储，二级存储设备作为随后分析。
Data acquisition systems are used to acquire process operating data and store it on, secondary storage devices for later analysis.
出于这个原因，正如我们前面提到的，它是一个好主意，保存在您的工作进展到二级存储设备。
For this reason, as we mentioned earlier, it is a good idea to save your work in progress to a secondary storage device.
HANA应用了常驻内存、数据源无关的计算引擎，要处理的数据存放在RAM中，而不是从二级存储设备中获取，这样提供了性能的提升。
HANA employs an in-memory, data source agnostic computing engine, where data to be processed is held in RAM instead of reading from secondary storage devices thus providing a performance boost.
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