克隆虚拟映像的挑战之一是，需要处理操作系统、网络和应用程序特定的自定义内容。
One of the challenges with cloning virtual images is handling operating system, network, and application specific customization.
处理器能力被划分为时间片，应用程序映像经常被换入和换出真实内存，设备访问由需求驱动，还受到访问权限的限制。
Processor capacity is doled out in slices, application images are constantly shuffled in and out of real memory, and device access is driven by demand and policed by access rights.
如果任意模块与安全异常处理功能不兼容，则最终的映像将不会包含安全异常处理程序表。
If any modules were not compatible with safe exception handling feature, the resulting image will not contain a table of safe exception handlers.
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