A chunk is the largest unit of physical disk dedicated to database server data storage.

区块是用于数据库服务器数据存储的最大物理磁盘单元。

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This is a solution where several physical hard disks (two or more) are governed by a unit called RAID controller, which turns them into a single, cohesive data storage block.

这是几个物理硬盘(两个或更多)有一个称为RAID的单元的管理的解决方法，它把他们变成了单一的、结合一体的数据存储块。

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To efficiently manage XML data, like traditional SQL data types, DB2 USES the XML data model internally, as the logical data model and as the fundamental unit of physical storage.

为了高效地管理XML数据，像传统的SQL数据类型一样，DB 2在内部使用XML数据模型作为逻辑数据模型，同时也作为物理存储的基本单元。

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