@Analoguesat
A couple more thoughts from my own experience:
- I tried to upgrade a DRX890 with a much larger disk,, but, after about 4-6 months of not terribly heavy use, I started to get a lot of stuttering when playing back recorded programmes but the box did not lock up completely - and the same thing happened when I (foolishly!) bought another one from ebay that had been "upgraded"
- OTOH, the DRX895 that I found in a LIDL carpark bin several years ago DID lock up when I tried to record anything, or tried to playback anything on the disk - and that one was "fixed" by a Factory Reset and appeared to work fine afterwards.
Therefore, I now tend to think that your box may not have a failed disk, but really needs that Reset, a
nd then don't let the disk get
ANYWHERE near "full" - my "rule of thumb" with the current DRX895 is to never let the free space drop
below 40%, and to try to keep it at around 50%, and, so far, that's worked since I bought it in 2012/2013.