它们是一些可与物理设备(比如hba)链接的特定驱动器。
These are the specific drivers that interface to the physical devices such as HBAs.
DMS 中所使用的容器则必须是预分配的文件或物理设备，如硬盘驱动器。
The containers used in DMS must be a pre-allocated file or physical device, such as a hard disk drive.
对于OLTP应用程序，将日志文件放置在单独的物理设备上是极其重要的，因为这样它们的频繁活动就不会给在同一硬盘驱动器上的其他工作带来不良影响。
For OLTP applications, it is very important to place the log files on a separate physical device where their high activity will not negatively impact other work on the same hard disk drive.
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