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。
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。
Rather than consigning an old computer to the e-waste scrap heap, give it a new, inexpensive hard disk—or just boot from a CD or a USB flash drive (UFD)—and re-purpose the computer as a thin client.
不必将旧的计算机扔到到电子污染废品站，而是为它提供全新的、便宜的硬盘 — 或从 CD 或 USB flash 驱动（UFD）启动 — 并将计算机重新配置为瘦客户机。
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