If it is an older model like H10, it used a a micro hard drive which may have failed mechanically. Those old hard drive devices were susceptible to shock failure due to drops. In some cases you may be able to replace the failed hard drive with a compact flash card - I believe they used the same connectors and pin outs. If it is not a hard drive model, can you get it recognized by windows drive manager to try to reformat it. There's a linux based program G-Part Ed. It's an ISO file, burn to cd or put on USB and boot pc to the cd or usb to launch linux and the software then see if it will recognize and format it as an external drive. Gibson research used to make spin rite that was able to fix some hard drive problems, might work on flash memory too.
