Originally Posted by grahamlthompson:
“It's a dvdr not a pvr and therefore it's entirely possible the OS is on the HDD”
Sorry, Graham, that's totally incorrect - it's a PVR, NOT a DVDR. It's actually a Digifusion Freeview unit badged by Sony.
If it's been correctly updated (via RS232) then the OS is in the internal memory of the unit, if it's only been updated via an OTA update then it's stored on the HDD, and loaded each time the unit is booted.
However, these units no longer have any EPG information broadcast, so it's probably not worth messing about changing the HDD anyway?.
If the OP really wants to, if he PM's me I'll advise him how to go on.