A portable storage device, such as a USB portable disk drive, comprises a main
body and a flexible casing. The main body has a connecting portion and a lamp portion.
The flexible casing is attached to the main body and encircles the connecting portion.
When the flexible casing is compressed and situated at a first position, the connecting
portion is exposed outside the flexible casing, and the portable storage device
is at a status of being used. When the flexible casing is not compressed and is
situated at a second position, the connecting portion is hidden in the flexible
casing, and the portable storage device is at a status of being housed. The lamp
portion can be a light emitting diode (LED) for showing the operating status of
the portable storage device, and a light-directing portion can be located at the
outside of the lamp portion.
