I/O device error

Hi,

I'm getting 'the request could not be performed because of an I/O/device error' on a flash drive, after about 35% done, with 'deep scan' enabled.

This in the log---[ERROR] WinAPI exception: FileDriveImpl.cpp(175) : The request could not be performed because of an I/O device error. (0x0000045d)

Thanks