这样，管理员即可更系统地确定应该保留和删除的对象。
This allows administrators to more methodically determine which object should be retained and which should be deleted.
但是，如果选择只删除卷，那么该卷将被破坏，但其子对象(如果存在的话)将完好无损地保留下来。
However, if I choose to simply remove the volume, then the volume will be destroyed but sub-objects (if any) will remain intact.
因为这些逻辑删除对象不会无限期保留，所以可能会发生usn回滚。
USN rollback can occur because these tombstoned objects don't hang around indefinitely.
引用计数(referencecounting)是对一个给定的对象当前有多少指向它的引用保留有一个计数，然后当最后一个引用被释放时自动删除该对象。
Reference counting involves keeping a count of how many references to a given object are extant, then deleting the object automatically after the last one is released.
引用计数(referencecounting)是对一个给定的对象当前有多少指向它的引用保留有一个计数，然后当最后一个引用被释放时自动删除该对象。
Reference counting involves keeping a count of how many references to a given object are extant, then deleting the object automatically after the last one is released.
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