External (USB) hard drive or portable hard drives comprise an enclosure made up of a typical hard disk having a USB interface adapter. Hence, these kinds of products are susceptible to all the common problems associated with hard drives and others that the external enclosure and interface may contribute. Portable external hard drives are usually dropped or toppled over; this almost always triggers a physical fault of some sort and leads to the hard drive making a ticking sound if it is next powered-on. Retrieving the information from portable hard drives with defects similar to this is possible when the specific fault has been identified and the storage device has been accurately repaired.

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