OK, well if as I suspect your drive has gone read-only, you will need to sort that out before there is anything we can do to rescue the HiDef recordings (at which point the old HDR-FOX will probably work normally again).
Gen up on the
custom firmware (see the links in my signature panel) and then install the latest (2.14 at present). You do not need to run the web stage of the installation at this point (it probably would not work), but you will need to establish a Telnet command console session to the server you just installed on the HDR. Details about Telnet are in the
Trail Guide (footnote to Stage 3B) and/or Wiki
HERE.
You will get a system menu with some disk repair options - see this topic
HERE (click). Maintenance Mode is what you want, detailed in the Wiki
HERE (click).
Once you are booted in Maintenance Mode, connect by Telnet again and choose option 1 (fix-disk). Let us know what happens.