Will Only Scan Color and single sided

Try adjusting the contrast and brightness settings when you scan. If the contrast is set wrong it will pick up the shade of the white paper.

Please check if duplex option is ticked.

The Canon DR-3080C is only color on the front side. The back side is monochrome only. The next model, which was the DR-3080CII will do double sided color scanning

Scanner will continue to scan at the same Speed! The problem is in the computer. Check if you have enough disk space, do a 'defrag' on your harddisk, create extra space by deleting unwanted files. IF your processor is slow and if you are scanning in color or converting to PDF while scanning, it may slow down the output.
S. Mohan, Chennai, India

You need to adjust the position center of the scan materials.. The scanner pulls sheets fronm the center of the feeder. Using a single sample page to scan.. You need to move the feed guides the same distance as your black line - either to left or right as appropiate.. (Which side is the mark?) to find the center w/out leaving black line edges. Keep adjusting it till you eliminate the black line. Foxed me good first time I saw it..

Try all formats, Color, Grey & Black & white. If you have problem it could be the scan module. Check for loose contacts, but this is rare in a working machine.
S. Mohan

If the bottom is vertically split, then there could be some problem in the hardware (bottom scanning module) Check for loose contacts. If it is cut horizontally, it must be definitely loose contat problem.
S. Mohan, India

If you select color mode and scan grey and color pages, the output will be Grey for Grey abd color for color. If you had chosen to scan in grey mode, color will appear in Grey only. 
There is an option to scan in both color and B&W simultaneously under multistream option.
S. Mohan, India

I recieved this error when trying to scan pages in using our new Kofax scanning solution with a DR-3080CII. I discovered that the latest canon driver for that scanner was not compatible with the software and it made the application hang in the background. I found an older driver that was compatible and installed it, no more error.

A color scan will give real output as it is. If the background is grey, the output will also be grey. If you select 256 Color output, there may be small change in color, as compared to the original. If you select grey output, all colors will be converted to Grey. If these files are converted to PDF, it will be same, except in ODF format.

If you select B&W you can save the file in TIFF format. Unlike grey or color, each pixel can be either black or white only. To scan in black and white you must select right brightness. By doing os you can eliminate background (technically noise) and capture foreground(data)

S. Mohan