external flash hard drive: I:\folder is not accessible

Hello everyone!
I am making backup from my videos and pdf's etc and now when i was trying to again access on folder it claims that it is not accessible. Any help on why and how this has happened and how i will fix it?

I had previously converted external hard drive to ntfs form from fat32 so i think i might have problem on rights. Folder information does not show any files or subfolders

Put the flash back into the system where you made the backup and make sure it is still viable. You may have to re-format the stick, then copy the videos over again.

there is a reason why those flash sticks some formatted fat32, sometimes they cant hack NTFS. Best thing to do is format the stick on the system where you are going to be putting the copies, then go back and make the backup on the original puter.

Hmm strange. When i changed it to another usb port it folder opened up right.