I have the same drive. It seems that this sudden issue is most likely caused by a dying hard drive. Possibly, your drive has failed or is failing, causing windows not to see it.
To see if windows at least sees the drive, try the disk manager.
Start menu > Right click on "Computer" > Manage > On left column click storage > Click disk management.
Your drive should be visible under there. If it is not, then most likely the drive is failing or corrupted, since lights are on but its having issues detecting.