Hi and Welcome. My Name is ***** ***** I look forward to assisting you today with your question.
I'm sorry but you have to get the cables to retrieve files from it. Most hard disks uses Mini USB cable (old hard drives) and Micro USB cables (new models). Both of these cables can be bought for less than $3
See this picture --> http://blog.premiumusb.com/wp-content/uploads/2012/06/mini_vs_micro.jpg
If it has bigger USB port, then you need to get the Mini USB cable --> http://www.amazon.com/C2G-Cables-Go-27329-Mini-B/dp/B00006B6PH/ref=sr_1_9?s=pc&ie=UTF8&qid=1452914519&sr=1-9&keywords=mini+usb+cable&refinements=p_n_feature_keywords_five_browse-bin%3A7800924011
If it has smaller port like cell phone charging port, then get Micro USB cable --> http://www.amazon.com/TeckNet-Premium-Android-Motorola-Blackberry/dp/B00WMCIRE0/ref=sr_1_21?s=pc&ie=UTF8&qid=1452914557&sr=1-21&keywords=micro+usb+cable
If you tell me the exact model of that hard drive, I will find the right cable. But one of the two cable is the one you need. Let me know.
If you have any questions or would like any additional information, please don't hesitate to ask