Hello ,
Thanks for the reply Alec.
So on 1 Sd card you can have 99 folders (directories) and in each folder 20 technics songs(sequencer songs).
Before I sold my kn6500 I made a backup off the hdsx6.
Now I have the backup on my computer : part1,2 and 3.
On the first part I have 300 songs (technics format) part 2 : 500 and part : 500.
All these songs have a number...I think this will be a hell off a job to reorganize all these files on the SD card , because all my songs were located on a specific directory on the hdsx6.

Greetings,
Alain