Hello!
Sorry for my english.
I had (and still have) a problem with an external hard disk, unrecognized by the system.
I don't know if it is a software or a hardware problem.
I think that will be very helpful for everyone having a program that scans all the usb devices and that correct, if it is possible, all the errors or, at least, say if the error is caused from a hardware or a software problem.
My best regards.