i can't mount my htc with sd card

Solution
It sounds like it may be a bad SD card. Have you checked in any other devices or on a computer?

You can also try ...

1. Take the card out of your phone.

2. Attach it to your computer and "format" the card on your computer.

3. Add your media (photos, music, etc.,) to the card through your computer.

4. Put the card back into your phone.

It should now register the card as being there and accessible.
It sounds like it may be a bad SD card. Have you checked in any other devices or on a computer?

You can also try ...

1. Take the card out of your phone.

2. Attach it to your computer and "format" the card on your computer.

3. Add your media (photos, music, etc.,) to the card through your computer.

4. Put the card back into your phone.

It should now register the card as being there and accessible.
 
Solution