Posted 19 December 2010 - 03:40 PM
If there is a letter assignment reflected in My Computer...there is a device attached.
What you call "drives"...may be nothing but partitions.
What USB devices do you currently have attached?
No device equals no letter in My Computer, although some attached devices may not be reflected in My Computer (e.g., an unformatted hard drive). If something is reflected as being present when it's not present...you have a problem I have never seen any data on.
Take a look in Disk Managment and see what's reflected there. You might also take a look in Device Manager and see what is reflected there for drives.
Start/Run...type diskmmgmt.msc and hit Enter for Disk Management.
Start/Run...type devmgmt.msc and hit Enter for Device Manaqer.
Also...some card readers may be reflected as multiple drives in My Computer.