Canon CHDK Show Space Bar, Show Filespace in Percent, Show Filespace in MB, Warning Unit, % Threshold, 1/4, 1/2, Don't, Don't, Horizon, Percent, Vertical, See this:

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Show Space Bar [ Donʼt, Horizon, Vertical ] < Filespace < OSD parameters

Displays a thin SD capacity remaining "fuel-gauge" icon on your screen. Location is positionable in your OSD Layout Editor.

•Don't - Turn off this feature.

•Horizon - Displays the bar-graph gauge in a horizontal orientation.

•Vertical - Displays the bar-graph gauge in a vertical orientation.

•Size on Screen < Filespace < OSD parameters

Changes the display size of your "Space Bar" SD-capacity gauge.

1/4 - the bar-graph only goes 1/4th the width or height of your EVF/LCD display. 1/2 - the bar-graph goes 1/2 the width or height of your EVF/LCD display.

1 - the bar-graph goes the full width or height of your EVF/LCD display.

•Width/Height < Filespace < OSD parameters

Change the width (for vertical space-bar) or height (for horizontal space-bar) in 1-pixel increments.

Show Filespace in Percent Enable [•] / Disable [ ]

Display your SD card space left in percentage of its total capacity. (Toggles between this and the MB option.) OSD display element positionable in your OSD Layout Editor.

Show Filespace in MB Enable [•] / Disable [ ]

Displays your SD-card space-remaining in Megabytes. Toggles between this and the percentage option. (see above).

Warning Unit < Filespace < OSD parameters

Don't - Don't display a warning when your free SD-card space is getting low.

Percent - Change your space remaining display to the warning color when the percentage reaches or goes below your selected "% Threshold" (see below).

MB - Change your space remaining display to the warning color when the Megabytes reaches or goes below your selected "MB Threshold (see below).

•% Threshold < Filespace < OSD parameters

Setting used in conjunction with above "Warning Unit" feature. Set the amount of SD-card space percentage remaining when you want that OSD element to turn to your chosen warning color.

•MB Threshold < Filespace < OSD parameters

Setting used in conjunction with the above "Warning Unit" feature. Set this to how many megabytes when your space remaining feature turns to your chosen warning color. Note: may be used in conjunction with a handy script if you need to ration the amount of photos you take on a long vacation.

See this:

http://chdk.wikia.com/wiki/UBASIC/Scripts:_Photo_Rations script.