My imac does not recognize an external hard drive

I have bought an USB external drive but my Imac does not recognize it,
the external hard drive does not appear in the desktop neither disk utilities.
characteristics of the disk
toshiba, 1TB, USB 3.0
thanks

The problem is NOT the fact that it is a USB 3.0 drive, as USB 3.0 is backwards compatible with USB 2.0. The problem is specific to Toshiba Canvio portable drives. They only work if you use a micro-USB2 cable instead of the included USB 3.0 cable. This problem does NOT affect other USB 3.0 portable drives (Seagate, Western Digital, etc.), and they work fine with USB 3.0 cables.
Once again, you need a micro-USB2 cable for the Toshiba to mount.

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