Slrt;No Accessible Disk found

Hi
I try to build a Dos loader for target with bellow features:
Multi Core enable- TCP/IP Connection
My Target Computer is PC Desktop with new Bios (Date 2017) and Matlab version is 2015b.
PC HDD is 128Gb SSD (Adata) and formated with FAT32. when PC boots, it shows ''Error: No accessible disk found : file system disable '' and I cannot ping to target.I test other ways for example I build a Dos loader with 1 Core and then this problem solved!!! and I can easily ping to target and when connected to target it shows HDD Partitions.
Please Help me!