It may not have explained myself, I'm using online translator. I will explain step by step.
1) Format quickly.
2) I click MENU to load MDBIOS.
3) Format Standard.
4) Enter the file and send SCD_RAM.bin flash.
5) Disconnect USB and insert the cartridge into the CDX.
6) Run SCD_RAM.bin like a ROM.
7) The Sega CD works and I press A, B or C to enter the MENU.

The RAM format, ready, it worked. The CDX has 128, RAM has 4500.
9) Perfect, now I can SAVES transfers the CDX to RAM. Up to this point, it works perfectly.
10) If I turn off the CDX and run the Sega CD MENU again, I copied all the CDX to RAM is corrupt! SAVES names are strange and their sizes have changed.
11) In short, I lost all the CDX SAVES ...