Hi, I found the solution after few hours of suring for the solution if any. I could not format also as it shows that the disk is used by some process which i could not find. Then i found one answer in yahoo forum and formated with the following syntax. format J: /FS:FAT32 /X. This is the command i used to format the pendrive, as there was some clash in formats. pendrive having fat32 and my file having ntfs format having more than 4 gb , which is a flv file.
I formated but could not copy this flv file, which shows the disk as full. Then a message suddenly pop up confirm stream loss. the loss could be the summery information. etc.I said yes but to no solution.After that i went to device manager, disk drives, select the usb drive and then went to properties, policies and selected optimum performance tab. Then , I double clicked my computer, went to the pen drive, and then select format, by which i got the choices menu in the format tab. fat or ntfs. I did select the ntfs and wow it worked and i could copy the flv file in the same format to the pen drive. Thank you very much for getting some problem myself and finding solutions, .
The essence of the matter is that some files show file size less than what it actually has.If it contains the other information which is not supported by the pendrive then this problem crops up. So, the content is also important. If it is a mere data file, then there would not have been any problem.