HTC MAGIC User Manual page 52

5 Phone Basics
To remove the storage card while the phone is on
When you need to remove the storage card while the phone is on, you must
unmount the storage card first to prevent corrupting or damaging the storage card.
1.
Press HOME > MENU, and then tap Settings.
2. Scroll down the screen, then tap SD card & phone storage.
3. Tap Unmount SD card.
4.
Remove the storage card by following the instructions in "To remove the
storage card" earlier in this chapter.