I have had my current PVR (Motorola DCX 3510-M) for a number of years, with the same expander (Western Digital) connected. A few of weeks ago, my expander started having all it's programs deleted periodically. At first I thought it was being formatted everytime the PVR was reset but that doesn't seem to be the case, as I just reset my PVR and the test program was still there when the PVR came back online. All the programs have been deleted off my expander about 5 times already. There are no screens that come up, notifying me of anything that has happened. So far, it has never happened while the PVR is in use.
When hard drives fail, they generally stop working or have damaged sectors, not delete their contents and then carry on as if nothing was ever wrong. Is anyone else having the same problem or have an answer as to why this is happening?