Disklavier

Yes, doesn't look too good.  If it were a floppy, it would be easy for 
the customer to send the media out for data recovery.  But a memory disk 
is basically a flash chip on one of the circuit boards.  Unless the chip 
is socketed, the whole board would need to be removed to attempt recovery.

In any case, the chances of recovery are also much slimmer, because at 
the hardware level, flash memory is organized into fairly large blocks 
(each potentially containing multiple songs, if the songs are small).  
If any of the content of a block changes, the entire block must be 
erased and then rewritten from a temporary copy held in memory.   
Interrupting this process means the flash memory could be left with some 
erased or partially-written blocks, corrupting the filesystem and 
resulting in the loss of multiple songs.

Diskettes, in contrast, are organized into sectors and clusters that are 
typically much smaller than flash blocks, so the amount of data at risk 
during a write is smaller too.

If the memory disk in the DKC55RCD is in fact some kind of removable 
device or socketed part, I might be able to help.

Mark Fontana



On 02/07/2014 12:01 PM, Spencer Chase wrote:
>
> ohhhh! that could be a real mess if it is onboard. i doubt that Yamaha 
> has any tools for recovering. getting the specs for the memory chip, 
> reading it page by page and reconstructing the files would be a major 
> project.
>
> On 2/7/2014 9:31 AM, Bill Brandom wrote:
>> Hi Spencer,
>>
>> The DKC55RCD has 16 MB of flash memory.
>>
>> Bill
>>
>> On Feb 7, 2014, at 9:01 AM, Spencer Chase <lists@... 
>> <mailto:lists@...>> wrote:
>>
>> hard to imagine an OS that could be so badly written as to scramble 
>> the disc directory but this could have happened? personally, i would 
>> remove the drive and try to read it in computer. data recovery is 
>> usually possible even if the directory is missing or scrambled. 
>> having it recovered professionally is expensive but there are 
>> programs that you can buy to do it yourself.
>>
>> On 2/7/2014 8:26 AM, Bill Brandom wrote:
>>> Hi Herb,
>>>
>>> Can he access the memory disks? If so, all music is gone from each 
>>> of the 16 memory disks?
>>>
>>> Bill
>>>
>>> On Feb 7, 2014, at 4:00 AM, <herblindahlpianotuning@... 
>>> <mailto:herblindahlpianotuning@...>> wrote:
>>>
>>> Greetings to the group from Connecticut. My name is Herb Lindahl and 
>>> I have been in the Piano Tuning and Restoration business for 30 
>>> years. I have a client here in CT with a Disklavier with the 
>>> DKC55rcd Control unit. He has owned it about ten years. He has made 
>>> many recordings of himself playing over the years. Recently, his 
>>> young daughter was recording herself playing, and while the song was 
>>> saving to a memory disk, she, by accident shut the unit off. Now my 
>>> client cannot access any of the music he had stored on the unit. Is 
>>> there a way to restore his music, or could it all be lost ?
>>>
>>>
>>> Thank you in advance,
>>>
>>> Herb Lindahl
>>> 860-644-9407
>>