Thank you @Ibernstone for the insight.

I tinkered a bit with the configuration of the EMMC, and I made some progress.

I initialize the EMMC with the "format_if_mount_failed" set as true. The first time the ESP boots, the EMMC is formatted with the default block size of 512 bytes.

By formatting ...

Hello,

I`m interfacing an ESP32S3 with an EMMC (Kingston EMMC16G-MW28-01E10), and I`m getting pretty low write speeds. I`m using the arduino framework and SD_MMC/FS libraries. The relevant snippets of the code are summarized below (the whole thing is a bit long).

I`m getting a maximum write speed ...