Brother MFC-7820N - Manual (Page 31)

How to scan using Windows ®
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Brother Scanner Utility (not available for MFC-7220 and MFC-7225N)
The Scanner Utility is used for configuring the scanner driver for resolutions greater than 1200 dpi and for
changing the maximum scanning size. If you want to set Legal size as the default size, change the setting
using this utility. You must restart your PC for the new settings to take effect.
To run the utility:
You can run the utility by selecting the Scanner Utility
located in the Start/All Programs/Brother/MFL-Pro Suite
MFC-XXXXX menu. (Where XXXX is your model name.)
Note
If you scan the document at a resolution of greater than 1200
dpi, the file size may be very large. Please make sure that you
have sufficient memory and hard disk space for the size of the
file you are trying to scan. If the memory and hard disk is not
sufficient then your computer may freeze and you could lose
your file.