Why sdcard shows that sd card removed unexpectedly

[Android Central Question]

My 4 GB SD card works very good till yesterday but today its shows that sd card removed unexpectedly even it inserted.if we remove the SD card from my lenovo tab and insert again it shows preparing SD card and then SD card removed unexpectedly

 

[belodion]

A faulty card reader? A faulty card?

 

[Rukbat]

Sounds more like a faulty card. Considering the price of an 8GB card is about $3, I wouldn't bother wih that card, just replace it. (Snap it in half so no one else finds it and wastes time trying to use it.)