And USB 3.1, released in 2013, has up to 1250 MB/s data transfer speed. For the USB 3.0, its nominal transfer rate is 625MB/s. USB 2.0 theoretically supplies 60 MB/s bandwidth, but overhead typically reduces this to an effective 25 MB/s to 30 MB/s. The data transmission speed of the external hard drive varies from the interface. Data read and write speedsĮxternal hard drives mainly have three interfaces: USB, FireWire (IEEE1394), and eSATA. Those are 1.8-inch external hard drives in 10GB, 20GB, 40GB, 60GB, or 80GB. Unlike most USB flash drives are only a few dozens of GB, external hard drives in the market are commonly in 320GB, 500GB, 600GB, 640GB, 900GB, 1000GB (1TB), 1.5TB, 2TB, 2.5TB, 3TB, 3.5TB, 4TB, even up to 12TB capacity.īut there also have some relatively small storage external hard disks. Usually, the storage space of an external hard drive is considerable. The other is backing up data of your computer in case of data loss due to internal hard disk corruption or hardware damage.īesides, as the external hard drive is portable, it also enables data exchange between computers locally. One is expanding the capacity of your computer when the internal storage space is not sufficient. There are two main purposes for you to use external hard drives. ![]() As one of the external storage devices like the common USB flash drive, the external hard drive is also portable and mobile. Unlike the internal hard drive that's inside a computer, an external hard drive is connected to the computer from outside via USB, FireWire, or wirelessly. ![]() So, to satisfy your needs for storing extra data, the external hard drive came out. Originally, the internal hard drive of your computer is the only storage space to save your data, but with the rapid development of the information era, it's far not enough. Let's take comprehensive learning of the external hard drive. The best external hard drive for Macīasic information about an external hard drive Guide to selecting an external hard drive ![]() Basic information about an external hard drive
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