If you face any concern relating to the mounting or unmounting of SD card on your Galaxy S4 then no want to assume a lot for that as it normally occurs even although you do the insertion and elimination of your SD card in a correct manner. There are some causes behind this concern, and these are:
> Either the cellphone or SD-card is not formatted
> The SD-card slot is damaged
> It occurs typically due to a short-term cellphone drawback.
> Your cellphone does not help the SD-card
> Any utility is operating in your cellphone, which is not permitting unmounting the SD-card.
Here are defined the doable options to repair SD-card unmounted and damaged error on Galaxy S4.
Methods to repair SD card unmounted and damaged error n Galaxy S4
Considering the drawback is associated to a short-term cellphone drawback go for rebooting or reset your cellphone as soon as after taking the battery out for few seconds. The drawback will be fastened if this was taking place due to the cellphone drawback.
Find out the specification of your SD-card and which the Samsung Galaxy S4 helps. Compare them and if you discover them totally different then you want to change the SD-card.
Check the SD card’s connector, and it ought to not be damaged, lacking or pushed in.
If the SD-card is not accurately formatted, or it is corrupted, then insert it in the laptop and see if your laptop can learn the SD-card. Take all the again up and format it once more to work correctly.
Sometimes this drawback happens due to the corrupted file system on SD-card, and you get the SD-card unmounted and damaged error, which can be fastened utilizing Desktop home windows’s constructed in chkdsk utility.
Start the command immediate (start->run->cmd.exe) and then kind chkdsk/X/F > SD card drive letter > and you will be in a position to repair SD-card unmounted and damaged error on Galaxy S4.