had a usb device that when inserted in a windows 7 pc keeps prompting the below. Tried to run elvated dos command to chkdsk g: /f, but it gives msg "cannot open volume for direct access"
Do you want to scan and fix your (F)?
There might be a problem with some files on this device or disc.
This can happens if you remove the device or disc before the files have been written to it.
Scan fix (recommended)
This will prevent future problems when copying files to this device or disc.
Continue without scanning.