External hard disks are designed for data storage, whereas portable hard disks are designed for data carriage. An external unit can be thought of as part of the computer, as a peripheral device such as a printer or scanner. Portable hard disks, on the other hand, more closely resemble thumb drives in terms of utility and function. A portable hard disk can load up on data from one computer and transfer the files to a computer in another location. An external hard disk, rather than transport data, simply add more GBs to a computer's data storage.
External and portable hard disk drives are computer storage devices that, unlike the primary hard disk drive, are outside the casing.
Portable and external hard disk drives are connected to computers via USB.
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