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The word "brick", when used in reference to consumer electronics, describes an electronic device such as a smartphone, game console, router, or tablet computer that, due to a serious misconfiguration, corrupted firmware, or a hardware problem, can no longer function, hence, is as technologically useful as a brick. The term derives from the vaguely cuboid shape of many electronic devices (and their detachable power supplies) and the suggestion that the device can function only as a lifeless, square object or paperweight. This term is commonly used as a verb. For example, "I bricked my MP3 player when I tried to modify its firmware." It can also be used as a noun, for example, "If it's corrupted and you apply using fastboot, your device is a brick." In the common usage of the term, "bricking" suggests that the damage is so serious as to have rendered the device permanently unusable.〔(CATB.ORG Jargon File )〕 ==Cause and prevention== Bricking a device is usually an unwanted consequence of an attempt to update the device. Many devices have an update procedure that must not be interrupted before completion; if interrupted by a power failure, user intervention, or any other reason, the existing firmware may be partially overwritten and unusable. The risk of corruption can be minimized by taking all possible precautions against interruption. Installing firmware with errors or for a different revision of the hardware, or installing firmware incompetently patched such as DVD firmware that only plays DVDs sold in a particular region, can cause bricking. Devices can also be bricked by malware (malicious software) and sometimes by running software not intentionally harmful but with errors that cause damage. Some devices include two copies of firmware, one active and the other stored in fixed ROM or writable non-volatile memory and not normally accessible to processes that could corrupt it, as well as a way to copy the stored firmware over the active version, even if corrupt, so that if the active firmware is damaged, it can be replaced by the copy and the device will not be bricked. Other devices have minimal "bootloader" firmware, enabled usually by operating a switch or jumper, which does not enable the device to work normally but can reload the main firmware. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Brick (electronics)」の詳細全文を読む スポンサード リンク
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