portable hard drive

That's why I backup my emails on a regular basis to an external device, in my case a portable hard drive.

这就是为什麽我备份我的电子邮件就定期向外部设备，在我的情况下，便携式硬盘驱动器。

Second, with three USB ports it can always be plugged into devices, such as a portable hard drive, to store things locally.

其次，三个USB端口总是可以插入像便携式硬盘驱动器这样的设备，以便就地存储各种数据资料。

There's a portable hard drive in the safe behind the counter.

柜台后面的保险箱里有一个移动硬盘

And a portable USB hard drive ( or large USB stick) can also help, especially if either of the machines lacks a network port.

有一个USB接口的移动硬盘（或者大容量U盘）也不错，尤其是在电脑没有局域网接口的情况下。