my pendrive is been shown but it cant read the files in it ..it says the data is unreadable and corrupted..it was working fine ..but i dont know what hapeenf..whn i chkd in command prompt it said that it does not hav system files!
Try to run "chckdsk x: /f", without the quotemarks and where x is the drive. I think you have to do it in Safe Mode MSdos [restart, press F8, go for "safe-mode with command prompt"], or when in XP mode: right-click on drive X, open Properties, Tools-tab, click "check now". You'll get message is not possible, only after restart: it will be scheduled at next reboot - just reboot.
If your disk is just too old, funked-up, or qurwalized and you just want to try to save the data, then please do use special software (or some PC-freak near u) - don't let XP try to fix it!
For more detailed options you can go here.http://www.techyv.com/questions/flash-drive-has-been-been-corrupted