找到Mac的USB接口。 将外置硬盘数据线的一端插入USB接口。 将数据线的另一端插入外置硬盘。 打开“聚焦”。 打开“磁盘工具”。 选择你的外置硬盘。 点击抹掉。 点击“格式”下拉框。 选择文件系统。 点击抹掉。 出现提示时，点击抹掉。

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
You'll usually find the USB port on the sides of the housing (MacBook) or on the back of the monitor (iMac). If the cable uses a USB 3.0 connection, it should only fit one way. USB-C connections can be inserted in any way that fits the port. The other end of the cable will usually be a proprietary connection that only fits one port on the external hard drive. Click the Spotlight icon, which resembles a magnifying glass, in the top-right corner of the screen. Type in disk utility, then double-cli