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awk '
BEGIN {
FS=":"
}

{ # default for all lines
color="yellow"
}

$1 == "red" {
color=$1
}

{ # all lines
...

As you don't assign FS (the field separator), the default (multiple white space) is taken. Thus $1 is always the entire line, "red" is not found, and the else branch of your if construct is taken....

You print the status for the last disk mounted only. Try printing the status for every disk by moving the print from the END section into the "Normal" section right after the if ... else construct.

The code is putting a new value in _status on every line and it reports the last _status in the END section. The last line is OK, so that is what gets printed.