Thanks everybody for your replies and just an update of my solution to the problem.
Firstly let me say melco are great sounding items and in no way am I saying anything different so please no one take offence...but.
Hdd's are user serviceable items....they will fail and frequently do. My melco is about 6 years old so a failure was to be expected.
At the time I bought it I was told to back everything up regularly using a portable 4tb drive from the machine. Which I did.
I'm not a computer geek and this seemed the ideal simple solution.
What nobody told me was this backup is in melco "speak" and is not easily compatable to use on any other machine. The files can only all be directly downloaded in one go onto a melco.
Further to that I was not informed that the melco os is loaded onto the hdd's so loose a drive and you loose everything including streaming of quobus.
And finally the quoted costs of melco repair.....simply eye watering. If you want the drives from Japan annointed with holy water from mount fuji . In my case £1500.
And here's one of the kickers ...they can repair it with locally sourced drives for just over £1000......what!!!
A quick peak in my machine revealed two seagate video drives available for around £70 a pop or a pair of we red nas drives available for £90.
I also asked as they would have my machine on the bench anyway what woild be the cost of the ex upgrade....still £500 , no discount.
My solution....roon nucleus with 2tb ssd drive into my dac via usb. File transfer by a fantastic dealer who is working through all the closed compartments on my back up drive , install onto new ssd in roon and reformat back up drive that can be eadily read and duplicated.
Incidentally the two melco and roon dealers I approached who shall remain nameless and requested the same where not interested....their computers too busy.
Tony from basically sound near norwich you deserve a special mention for unlocking this mess melco has got me into.
Melco n1a will be sold on
eBay spares or repair.
Read the thread again . Some SSD,s sound better and some sound worse according to some , so it's like the other rabbit holes . Just to be clear and apologies for taking this away from the original post . I switched from a Seagate portable HD in my Pi4 used as an LMS only to a Crucial SSD HD and I thought that sounded better . Now I find that maybe some SSD drives sound better than others .
Read the thread again . Some SSD,s sound better and some sound worse according to some , so it's like the other rabbit holes . Just to be clear and apologies for taking this away from the original post . I switched from a Seagate portable HD in my Pi4 used as an LMS only to a Crucial SSD HD and I thought that sounded better . Now I find that maybe some SSD drives sound better than others .