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I had the same problem - the hard drive had failed, which is a common fault. I bought a new one on eBay - a Toshiba MK3006GAL 30GB - which worked fine.
BUT... the drive came completely unformatted and I had to format it on a laptop first as I could not get it to format in the YH-J70. If the drive is FAT32 format, however, you should be OK to just put it in the YH-J70 and format it with Samsung Media Studio.
When I first got my yh j70 I had the same problem. Have you made sure its in 'charge' mode? When you go to 'settings' there is an option tha allows you to switch from 'charge' mode to USB connect mode. You have to switch it depending on what you are trying to do. Hope this helps.