You can also check the article below, applies for XP and W7.
Although the top of the page makes it appear to be XP specific, if you scroll down to the Properties section, you'll see W7 listed ..

https://support.microsoft.com/en-us/kb/330140

Basically if a Drive doesn't have an assigned drive letter it's more prone to happen. Even moving the USB drive to a different port (or using another device in that same port on occasion) can cause this in my experience.

Last edited by rharv; 07/17/16 06:43 AM.

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