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However, whereas PCs typically have a rechargeable battery or removable coin cell that is used to retain configuration settings and maintain the time-of-day while powered down, Sun hardware instead uses a TIMEKEEPER device which integrates SRAM, RTC and a battery. Hence when the battery fails, the entire device must be replaced.。关于这个话题，新收录的资料提供了深入分析
Example: replace current line with "hello"，推荐阅读新收录的资料获取更多信息
Jo LonsdaleNorth East and Cumbria
Each block in the chain has an exact timestamp and can't be changed.