Portable external hard drive

A portable external hard drive comprising:

• a body having a casing and a circuit board received in the casing and having a connecting end formed on one end of the circuit board and extending out of the casing to be adapted to connect to a computer and an engaging end formed on the other end of the circuit board;
• a memory module having a casing and a circuit board, wherein the casing includes an upper casing and a lower casing, the upper casing has protrusions defined in an inner face of opposite side faces of the upper casing to correspond to recesses defined in the lower casing so that the upper casing is able to engage with the lower casing by means of the protrusions being snap fitted in the corresponding recesses, wherein the upper casing further has a first upper cutout in one distal end of the upper casing and the lower casing has a first lower cutout in one distal end of the lower casing to correspond to the first upper cutout so that the upper and lower casings of the memory module define an opening to receive the socket end of the circuit board of the body;
• and
• a cap having an indentation defined to be connected to the casing of the body so as to detachably connect to the casing of the body to enclose the connecting end of the circuit board of the body, wherein the cap has an upper part and a lower part securely mounted with the upper part, the upper part further has a connecting part for securely engaging with a clip.