Hi all,
I am using a GTK C program in my embedded linux device. I need to backup a folder from my internal memory to pendrive when a button is clicked on the UI. While this, the pendrive is getting mounted as /dev/sda1 and I able to copy files to the /dev/sda1 and after this write cycle from my program, the pendrive volume becomes busy and I am unable to eject it. So when I remove and insert the pendrive, it is getting detected as /dev/sdb1. As the mount location is changing dynamically, I am stuck on how to write my files to pendrive from GTK C program. I am using libudev for pendrive insertion and removal detection.

Is my way correct? If not kindly help me with how to copy a folder from internal memory to pendrive without making the volume busy.

Thanks for your time.
Regards,
Nishanth

I don't think we can answer this question, since we know too little of your program. Questions I have:

Are you writing to the storage device directly, or to a filesystem on the storage device?
What do you mean by "busy" and how do you know it is busy?
Are there relevant kernel messages?
I would put a filesystem on the pendrive. FAT has the advantage that you can read the drive on other OSs than Linux. ext4 has the advantage of supporting the Linux permissions concept.
Then mount the pendrive to a directory and just copy. To ensure you mount the correct device and avoid confusion between sda and sdb, use the filesystem's UUID for mounting or create a label and use that.