Starting UNILOGIC V 1.41.212, UNISTREAM OS 1.41.139 - see Release Notes:

https://downloads.unitronicsplc.com/Sites/plc/Unilogic/UniLogic_1.41.212_September_2025.pdf

Additional to FAT32 SD and DOK media format introduced EXT4 media format.

You can format external SD from UniLogic->Unistream Management->Format SD->Format SD (EXT4).

You can format:

EXT4 format allow to use SD card with highest than 32GB capacity.

EXT4 format offers improved resilience against power failures, reducing the risk of data
corruption compared to FAT32.

You can format external SD and DOK (not recommended) from Unistream PLC UniApps->System->Control->Format.

You can transfer files from EXT4 formatted SD card to DOK as you did before - by use UniApps option, or from UniLogic SD browser.

As well, you can use FTP protocol to transfer files from external SD card to FTP Server.

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Temporary SD Format to EXT4 from UniApps for SD > 32GB does not work.

This eventually reboot On-Board PLC or stuck Modular PLC.

Format >32 GB SD with SD to USB-A adapter than insert it into SD slot.

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