I have several drives attached to a 64-bit Windows 7 Professional machine. In the last week, I am getting repeated, constant autorun popups for a new drive, with the label 'System reserved'. Before I can click on anything, the popup window disappears. If I look in My Computer, I can see my usual list of drives, however every few seconds a new drive (system reserved) will appear for just a second and then disappear. This happens constantly. Sometimes, I can get this to stop - sometimes by removing a USB device. Other times it just continues.
I'm unable to do anything in the disk management screen, as it'll freeze trying to figure out how many drives there are. I can't look in the Device Manager, as every time the new drive flashes in and out of existence, it refreshes the screen - so it's just constantly flickering.
I guess it seems like a hardware issue - like perhaps a cable is dodgy and the connection is being made and broken repeatedly... except that it appears to be the system reserved partition, which, presumably, would be on one of the existing drives that are all working correctly.