4 GB sandisk pendrive can't open

check which all song format car sterio works and convert the files into that format using format factory (which is available free for downloading) and check it will work

repair your operating system by using a bootable disk

i cannot open or format my 16gb transend pendrive ...when i tries to open a message appeares " please inset a disc into drive "........plz help me..

Possible that the pendrive is not detected as your PC does not have the software for confirming. So download the software from the Kingston site--- sicne you have not mentioned the Processor of the PC- install and then insert the USB to confrim.
Please also checck for the drivers of the USB- or reinstall

you may need some USB drivers for this particular pendrive
control panel admistrive tools,computer management,device manager you should see a yellow question mark? right click to reinstall drivers
hope this helps

If your pc has virus or your pen drive have some virus u get these problems just try to plug in another pc and try to format..

Your drive could be corrupt. The first thing I would do however is make sure you are plugging it into a good USB port. If you are using a desktop with USB ports in the front, and are plugging the drive in there, remove it and plug it in to one of the USB ports on the back of the computer. Many times the front ones will have issues with certain USB devices. If that doesn't work, you very well may have a bad usb drive. I would try it on another computer if switching the usb port doesn't help, to see if the drive is truly not working or just a driver problem on your computer.

your card may be crupt or virus infected
please format card and turn phone to factory settings then try the card againif not work you have to buy new card.

Best thing to do is format the drive. Dont go for a quick format

how to solve the problem