HTC One M8 for Windows - Manual (Page 159)

5. Insert the microSD card tray back into the slot.
Unmounting the storage card
When you need to remove the storage card while your phone is on,
unmount the storage card first to prevent corrupting or damaging the files
in the storage card.
1. Swipe down from the top edge of the screen with one finger.
2. Tap All settings > storage sense.
3. Tap SD card > remove SD card.
Removing the microSD card
Make sure to unmount your microSD card before removing it.
1. Hold the phone face up and the top panel facing you.
2. Insert the tip of the tray eject tool into the tray eject hole next to
the microSD card slot.
Storage 159