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Saving files causes diskette drive activity

From MozillaZine Knowledge Base

If you are able to save files to your computer's hard drive but it causes activity in the "Floppy" (A:) diskette drive during the download process:

This can happen if you previously downloaded a file to the diskette drive but the download did not finish. To resolve the problem, open the Downloads window in Firefox ("Tools -> Downloads") and clear the list of downloads. [1]