Bill Greiman

The Teensy 4.1 standard SD library supports exFat. Post a question on the [Teensy Forum](https://forum.pjrc.com/) for help.

Have you tried other cards? I have seen a few cards that require a power cycle to accept a second software reset command. If there are other devices on the...

The SPI bus on the Due that had problems was "dedicated" but killed the SD upon program reload and sometimes reboot. Put a logic analyzer on the SPI bus and...

It is not practical to detect a corrupt filesystem with the limited memory of a microprocessor like SAMD. SdFat can detect some problems but corrupt FAT chains or corrupt directory...

I have no idea what you want to do.

You will never achieve 100kHz with an AVR. You might with a Teensy 4.1 but only if you have experience with Teensy DMA.

Classes that begin with Sd like SdFs are for SD cards. The SD standard is only defined for a single partition with a specific layout. I use the underlying classes...

FatVolume, ExFatVolume and FsVolume do not read or parse the MBR if the partition number is zero. It then assumes the device has a volume starting at sector zero. If...

I have done a first cut and the slight rearrangement of code actually saves a few bytes for UNO users who try to use SdFs. I hear from UNO users...

The error: > Error code 0x1D > Error data 0xFF Is a read timeout error. So the first read of the SD fails. This has nothing to do with the...