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About product and suppliers:
        Alibaba.com offers 4,163 portable hard disk products. About 37% of these are hard drives, 23% are hdd enclosure. 

A wide variety of portable hard disk options are available to you, such as 2.5", 1.8", and 3.5". You can also choose from internal, external. As well as from ≤ 60gb, 500gb - 750gb, and ≥ 2tb. And whether portable hard disk is sata, usb, or sataii. 

There are 4,144 portable hard disk suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and Taiwan, which supply 98%, 1%, and 1% of portable hard disk respectively. 

Portable hard disk products are most popular in North America, Western Europe, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 745 with ISO9001, 254 with Other, and 91 with ISO14001 certification.