There is no reason your data won't be safe on an NTFS partition, and indeed copying it back to the FAT partition will allow DOS to access it.
I format my USB drives FAT32, just so I can take them with me and plug then into any system that can talk USB and access the data.
I format my USB drives FAT32, just so I can take them with me and plug then into any system that can talk USB and access the data.