The interface of the connection of the HDD is the connection with the computer, therefore when you buy an HDD you should verify that your computer has the relevant connection slot compatible with the HDD interface.

The convenient USB connection provides a possibility of connecting an external HDD to almost any modern computer and to handle the data stored therein both at work and at home.

Standard USB 2.0 connection:

During the next years the USB 2.0 will be replaced by the new USB 3.0 interface:

The weight of the external HDD without accessories and the power supply unit. This measure is approximate and can slightly differ from the actual weight of the disc.

External HDDs can be divided into stationary discs that are used at a certain location and portable discs. The first ones usually are heavier and with the current adapter as the power supply source. Portable discs are smaller and lighter (this is achieved by using the 2,5'' internal HDD and a very light enclosure) and the USB supply type.

HDD rotations is a parameter impacting the speed, electricity consumption and the noise of the operation of the device.

If you want to achieve the maximum writing/ reading speed you should buy an HDD with the disc speed of 7200rpm. If the mobility, silent operation and electricity saving are important you should choose an HDD with 5400rpm or less.