|"...some times it recognized as pen drive and showing data in pen drive but mostly it showing as usb device not recognized..."|
Whatever port you had it plugged into, it should be detected consistantly (every time) as one or the other of those.
See response 2.
It must be plugged into a port it will work properly in according to that info.
If it's inconsistant in the same port (sometimes detected, sometimesunknown) that's probably caused by a poor connection - e.g. a damaged USB port that has it's outer metal shroud bent out of shape such that it's too big, or the USB plug portion of the pen drive is bent out of shape, either of which can cause the pen drive to be too loose in the USB port.If the pen drive is not loose in the port, then the pen drive is probably physically damaged.
"...but when it detected I checked inside data of pen drive its contain two hidden files of " bfucr" notepad file and ,"autorun.inf" file...."
autorun.inf is normally not a hidden file.
It normally contains info that tells Windows to run some program when you first plug in the drive. If the program it wants to run is not on the pen drive, or not on the hard drive in some location it refers to, nothing happens.
I searched the web using: bfucr
There's absolutely no evidence it's malware (a virus or whatever) , and if it's a file that can be read by notepad, it can't be malware program in any case.
"....I tried so much time to format it but no use it saying as this drive using by other process "
"...this drive using by other process "
You probably created that situation yourself.
You can't access the pen drive with two things at once in Windows, or two instances of the same thing. Exit or Close all programs you used to access the drive except the one you are trying to use. .
If you don't care about whatever data is on the pen drive, and you just want to make it usable again...
If you want to re-format it, either
- use Disk Management,
(Control Panel - Administrative Tools - Computer Management - Disk Management),
RIGHT click on the pen drive, select Format
or RIGHT click on the pen drive in My Computer and select Format
If you can't Format it, or if it does not show up in Disk Management or My Computer,
OR - if there is data on the pen drive you would rather not lose, then you can attempt to repair the data damage, by using one of the programs I listed in response 4.
You can re-format the pen drive in Windows, but can't Delete the partition or partitions on the pen drive in Windows by default.
You may be able to do that with one or more of those programs,
or see this - use the Lexar flip removable bit tool
Multi Partition a USB Flash Drive in Windows