Know everything about your storage: free space, total space, mount options, device name, partitions
It supports several file systems, like ext4, exFAT or FAT/FAT32 (VFAT).
Confirm that your card is not damaged, and it is not fake (not labeled higher than it is in fact).
Detect eMMC, UFS 2.0 and 2.1 or higher for internal cards, detect class type (class 10, UHS-I, V90) for external cards.
Try with several combinations, set one or more files and use different file sizes
Test any type of SD cards, including Micro SD, SDHC and SDXC cards.