When I use your example RamDiskToSdFat, and change "n" (the number to writes to ram) we can increase the file size. You used n = 1000
n = 1000, FileSize = 17k
2000. 35k
5000, 90k
6500, 118k
7000, 125k
7500, 125k
8000, 125k
The file size stops at 125k. That's just one ram chip of data.
I believe my hardware is working OK. When I use the MultipleChipTest example, I get:
with 1 chip 32,000 numbers
with 2 chip 64640 numbers
when I tell it 3 chips (and have just 2) the data stops at 64512.
Gerry