Size format
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This field contains a size format for files and directories as it would be in the output file.
The order of size of files and folders, that would be formatted, may be on of the following: bytes, kilobytes, megabytes, and it is selected in the list to the right of the format list.
The common look of the format is:

any_characters "%"["." prec]Type any_characters

The '%' (percent sign) must always be in the size format. This character, is followed by the next characters (without spaces):

An optional precision specifier, ["." prec]
The conversion type character, type

The following values for type are valid:

e   Scientific. The value of a size is converted to a string of the form "-d.ddd...E+ddd". The resulting string starts    with a minus sign if the number is negative. One digit always precedes the decimal point.
f   Fixed. The value is converted to a string of the form "-ddd.ddd...". The number of digits after the decimal point is given by the precision specifier in the format string—a default of 2 decimal digits is assumed if no precision specifier is present.
g   General. The value is converted to the shortest possible decimal string using fixed or scientific format. The number of significant digits in the resulting string is given by the precision specifier in the format string—a default precision of 15 is assumed if no precision specifier is present. Trailing zeros are removed from the resulting string, and a decimal point appears only if necessary. The resulting string uses fixed point format if the number of digits to the left of the decimal point in the value is less than or equal to the specified precision, and if the value is greater than or equal to 0.00001. Otherwise the resulting string uses scientific format.
n   Number. The file size is converted to a string of the form "-d,ddd,ddd.ddd...". The "n" format corresponds to the "f" format, except that the resulting string contains thousand separators.