Yamaha DTX-PRO Reference Manual page 79

MENU Button
4.
Press the "YES" button ([F1]) to format.
Do not disconnect the USB flash drive from the [USB TO DEVICE] terminal or turn off the power to the DTX-PRO while the USB
flash drive is being formatted. Doing so may cause the DTX-PRO to malfunction, or corrupt memory in the USB flash drive.
"Completed." appears when the Format process is complete, and the screen returns to step 2.
Memory Info
MENU/File/Memory Info
Description
Shows the memory usage of the USB flash drive.
Free: Free memory space (MB) (free memory space (%))
Free space is displayed in units of MB (megabytes). Also, the free space for the entire memory is displayed as a percentage (%).
Total: Total memory size (MB)
Displays the total memory size in units of MB (megabytes).
Units used to denote capacity change according to memory size (KB: kilobyte, MB: megabyte, GB: gigabyte).
DTX-PRO Reference Manual 79