USB Optical Drive 用USB启动 USB Hard Disk Drive 用外部连接近来的硬盘启动，就是我们常说的移动硬盘。 Internal Hard Disk Driver 用电脑自身的硬盘启动 .
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You may normally boot from a hard drive, but you may sometimes need to boot from a floppy disk, a USB memory key, a CD or DVD, or a network.
您可能通常从硬盘驱动器引导，但有时可能需要从软盘、usb内存密匙、CD或DVD，或者网络引导。
If you're in doubt, you can use a GPT-aware partitioning tool to set up GPT partitions on a spare hard disk or a small removable disk, such as a USB flash drive.
如果您不确定，您可以使用一个支持GPT的分区工具在一个闲置硬盘或者一个小型可移动硬盘(比如usb闪存驱动器)上建立GPT分区。
The MacBook comes equipped with a 250 GB hard disk drive, 8x "SuperDrive, " Gigabit Ethernet, two USB ports and mini DisplayPort to connect an external monitor.
MacBook笔记本配有250G硬盘驱动器，8倍光驱，超高速以太网，2个USB接口，以及与外接显示器相连的迷你显示端口。
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