只怕Coil whine(翻譯應該是線圈嗚嗚聲 XD) ><
https://www.notebookcheck.net/Dell-Latitude-7480-7600U-FHD-Laptop-Review.210920.0.htmlBusiness as usual. With its redesigned chassis, lighter weight and much-improved battery life, the upper-class Latitude once again ticks all the right check boxes when it comes to business notebooks. The 14-inch 7480 is equipped with current-generation hardware, offers great performance and features a top-notch keyboard. Coil whine is very noticeable, however.
There is also a negative aspect, however: like the smaller 12.5-inch Latitude 7280 and the middle-class 14-inch Latitude 5480, the 7480 suffers from very noticeable "coil whine" whenever the SSD is being accessed.
While most noticeable during disk and other benchmarks, the noise is apparent even when the notebook is sitting there idling and background processes are active. Users who are sensitive to high-pitched noises are likely to be unhappy in the long run, unless Dell finds a way to alleviate the problem. 他提到尤其是在SSD讀寫的時候更能夠清楚聽到