[arduino 1.6.10] sd ram issue

I Have a 32Go SDRAM I tried to format with one partition FAT16 2Go, 1Go FAT32 2 Go,32Go…

Each time I call SD.begin(), init() fails even if I give correct CS parameter (here port 4)…

Disk /dev/sdd: 31.3 GiB, 33554432000 bytes, 65536000 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x00000000

Device Boot Start End Sectors Size Id Type
/dev/sdd1 2048 4196351 4194304 2G 6 FAT16

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#define sd_cs  4
#define lcd_cs 10
#define dc     9
#define rst    8

TFT TFTscreen = TFT(lcd_cs, dc, rst);

Sd2Card card;


Serial.println("Try reading SD card...");
if(!SD.begin(sd_cs))
{
 Serial.println("...failed :{");
}

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