32gb or 128gb?

GPS/GNSS Development Boards
1

I was reading through the RTK receiver documentation and found this

“ . Any FAT16 or FAT32 formatted microSD card up to 128GB will work. We regularly use the SparkX brand 1GB cards but note that these log files can get very large (>500MB) so plan accordingly.”

On the link below

https://docs.sparkfun.com/SparkFun_RTK_ … a_logging/

Although every other place I’ve read that 32gb is the max, can this be confirmed?

2

FATFS should be fine up to 400GB, where the issues arise is that Microsoft wanted everything 64GB and above to use EXFAT, but you can format FAT32

3

Hi,

The RTK Firmware uses Bill Greiman’s SdFat library for Arduino. SdFat dictates what card sizes and formats are supported. We’re currently using v2.1.1 and the SdFile file type.

I ran a test on SdFat a couple of weeks ago and the following configurations worked well for me:

128GB SanDisk exFAT

64GB SanDisk FAT32 (formatted with rufus)

32GB SanDisk FAT32

2GB Unbranded FAT32

1GB Brand_X FAT16 (formatted with SD Association Formatter)

Best wishes,

Paul