USB Drives not recognised in Windows 10

It seems there are some issues with regards to WD external USB drives, there is a forum post on the WD community site as well.Got a Windows 10 upgrade notification yesterday and I ' upgraded' to windows 10 rtm (again). This time all WD were detected. Before I did the upgrade using the Windows 10 DVD. That is the only difference. Can't explain. Using Asus X99 Deluxe/U3.1 with latest firmware. The drives are connected to USB 3.0 ports.. Crossing my fingers Windows will continue to detect them.
Maybe you cud try installing SES drivers? However, essentially that shouldn't be necessary.
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jaburmester said:

Solved problem by going to disk management and assign drive letter to drive to USB drives.

Worked for me. Disk management, right-click on the mystery drive of known quantity storage and select "change drive letters and paths." Select a letter for the drive and smash ok. Done.

jaburmester said:

Solved problem by going to disk management and assign drive letter to drive to USB drives.

~ ~

So I went to Disk Management (via windows-key + X>
and all those options about assigning drive letters were greyed out and inaccessible.

So after clicking on the graphic of the drive space and checking that the
details matched my USB drive (Toshiba 500 Canvio) and

absolutely ensuring I was not clicking on my hard drive by mistake,

I went ahead and right-clicked on the biggest partion, and deleted the biggest partition.
Then I went on to make a new one.

(because for some reason, error messages showing, claiming not a Windows partition or something to that effect)

And THAT worked !! My USB hard drive now gets drive letters assigned to it, and everything works nicely.

CAUTION: Obviously, all the USB hard disk's data is going to be wiped out by this operation, and I was fortunate to have another vintage laptop with former O/S, that would read the USB hard disk's data and back it up, before I went ahead with this.

SO SUCCESS! ... after several futile attempts over the last few months ... and happier because my newer Win 10 has USB 3.0 ports, as does my USB hard disk, so things work better.

owens138 said:

Worked for me. Disk management, right-click on the mystery drive of known quantity storage and select "change drive letters and paths." Select a letter for the drive and smash ok. Done.

WD passport drives seem to drain more current and a few I tried were not connecting 95% of the time and even when they would connect they disconnected when I tried transferring files. Following WD troubleshooting I connected using a "y cable" connected to an external power supply and it connected immediately and works properly.

My experience, not a universal cure.

Another thing to check is your anti-virus, some now block external drives and you need to set exceptions or turn this feature off. (Avira is one culprit of this)