HandHeld ALGIZ RT7 Manual page 37

Unmount SD card - to unmount the SD card before removing it, to avoid data loss.
Erase SD card - to remove all the data stored in the SD card.
FIGURE 5.27. SDCARD STORAGE SETTINGS
It displays total space allowed to use, currently available space in USB storage.
Unmount USB storage - to unmount the USB device before removing it, to avoid data loss.
Erase USB storage - to remove all the data stored in the USB.
FIGURE 5.28. USB STORAGE SETTINGS
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