其實依照"有點軟"的說明，我覺得是原因就如下面這一段...


Note when the event messages are posted and try to determine if it coincides with certain
processing schedules (such as backups) or heavy disk processing. This will help to determine
what device may be causing the errors.

The reason that drives tend to have these types of problems under heavy stress is often slow
microprocessors. In a multitasking environment, the processor may not be fast enough to
process all the I/O commands that come in nearly simultaneously.


當然我會這麼認為也是因為平時使用不會有這問題，甚至備份整顆硬碟資料時只要分次，不要讓資料太多(我試過複製一顆1.5TB(ST31500341AS)的硬碟的資料到一顆3TB(ST3000DM001-1CH166)的硬碟上，將檔案分3次複製)，也是很正常的完成，C7也不會增加...

不過其實我也還懷疑另一個原因是上禮拜新買的3TB硬碟(ST3000VX000-1CU166)多工能力不如3月底買的這顆3TB(ST3000DM001-1CH166)，不過既然買了也沒辦法，而且ST3000VX000-1CU166這顆保固多了一年...