How to put more samples on SD card - RMX 1000

Hello,
I put a 1GB SD card in the RMX and reading samples functioning properly.
However I can not put more than 16 samples.
I specify that the root of my SD card there are 2 files:
RMX-1000 (containing 16 12.7 MB size samples)
and
RMX-1000.RSD
I want to know how to add more samples. 12,7Mo for a 1GB card that's rich!
I tried but every time my remixbox RMX-1000 replace files, letting me with a maximum of 16 samples.
Can we have multiple directories RMX-1000 on the map? Or there would be another trick?
Sorry for my english, i'm french.

Thanks for your help.