Disklavier

I see that Bill is waiting for Herb to respond. I too am wondering to if ANY of the memory disks can be accessed? What happens if an attempt is made to just specify a different memory disk? If so, it could still be possible to copy a single or all songs per memory disk to a floppy. Worth a try? For managing memory disks, go to: http://snurl.com/DKVAdvOwnersManual

I see from the hardware manual Bill sent me that the memory 'disks; consist of 16 units ea. of 4 MB or 64 MB, most likely identified as Flash Memory v1.00 and labeled PP-BSL. Also, there are two 16 MB DRAMS labeled, MSM5118160D-60J and VG2618160CJ-6-EL10. It is quite possible that the RAMs took a hit and data never got written to Flash Memory. If so, the data may still be on
 Flash Memory --- just can't be accessed because you still need RAM to make things work. Without opening the unit up, I have no idea if the RAMs are socketed. Does the DKV check RAM on bootup?

Mark Fontane, here, 'volunteered' to help if the Flash Memory is socketed. I assume, Mark, you have an EPROM reader. The challenge here is what is the format of the data? Could it be as simple as a 1:1 correspondence of the MIDI data on a floppy?

I don't know what the best option is until more information is obtained as Bill has asked.

Hoping for the best,

Fred
NJ




On Saturday, February 8, 2014 5:52 PM, Adrian Thomas <mangez@...> wrote:
 
  
I agree with this.
If file allocation table is damaged, it's very hard to recover anything. If the error occurred while re-organising and re-writing blocks of files (individual files can be scattered all over the memory/disk), it would still be a problem. A specialist firm might be able to recover files (at a price), but to all intents and purposes, I would say that the data is lost.

Adrian Thomas

On Feb 7 2014, Mark Fontana wrote: 

>
>
>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 
>>> > 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, 
>>>> > 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
>>>
>