Hard disk device

A hard disk device, comprising:

• a main portion, comprising:
• a front end,
• a rear end opposite to the front end,
• a top surface,
• a bottom surface opposite to the top surface,
• a first side surface defining a first connecting hole located nearby the front end, and
• a second side surface opposite to the first side surface and defining a second connecting hole located nearby the front end;
• and
• two pads, each of the pads comprising a shank portion and a head portion, the head portion comprising a connecting portion connected to the shank portion and an external portion surrounding the connecting portion, the shank portion being fixedly inserted into a corresponding one of the first and second connecting holes, and portion of the external portion protruding from the bottom surface of the main portion;
• wherein the connecting portion comprises an engagement protrusion protruding from an outer edge thereof, and the external portion defines a central opening and an engagement groove in an inner side surface surrounding the central opening, the engagement protrusion is engaged into the engagement groove.