HTC One M8 - Manual (Page 13)

§ Moving apps to the storage card doesn't back up the apps. If you do a factory
reset, your phone loses the apps. You'll need to reinstall them.
§ When you remove the storage card and insert it in another phone, the apps on the
storage card won't be installed automatically to the other phone. You'll need to
reinstall them.
Inserting the microSD card
1. Hold the phone face up.
2. Insert the tip of the tray eject tool (or a small bent paperclip) into the tray eject
hole next to the microSD card tray slot.
3. Push the tip all the way into the hole until the microSD card tray ejects.
4. Pull the microSD card tray out, and place the microSD card (contacts facing
down) into the tray.
5. Insert the microSD card tray back into the slot.
Unmounting the storage card
When you need to remove the storage card while HTC One is on, unmount the
storage card first to prevent corrupting or damaging the files in the storage card.
1. Go to Settings, and then tap Storage.
2. Tap Unmount SD card.
13 Unboxing