Samsung YH-J70
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.
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