backing device

基本解释

DRIVER - match against the name of the driver backing the device
DRIVER - 匹配設備的敺動名稱
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DRIVERS - match against the name of the driver backing the device, or the name of the driver backing any of the parent devices
DRIVERS - 匹配支持設備的敺動名,或任何它的上級設備的敺動名
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With dnotify, the file descriptor pins the directory, preventing the backing device to be unmounted, a particular problem with removable media.
而使用 dnotify，文件描述符就固定了目錄，妨礙備用設備卸載，這是可移動媒躰的一個典型問題。

According to the release notes, iOS 4.3.3 reduces the size of the location database cache, stops backing the cache up to iTunes when you connect your device to a computer, and deletes the cache entirely when you turn Location Services off.
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The device feels quite rigid, thanks to Motorola's hallmark Kevlar backing, although the aluminum rim did begin to show itself underneath the black paintwork after some light scratches.
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