what does this section of a script mean ection $5$

else $\{$

$volume $=$ Get$-$Volume $-$ErrorAction Stop $|$ Where$-$Object $\{$ $$\_.$DriveLetter $-$eq

$Drive $\}$

if $($$volume$)\{$

$total $=$ $volume.Size

$percentFree $=[$int$](($$volume.SizeRemaining $/$ $total$)*100)$

Add$-$Content $-$Path $logFile $-$Value $"[$INFO$]$ Percent Free: $percentFree$\%"$

$\}$

else $\{$

Add$-$Content $-$Path $logFile $-$Value $"[$ERROR$]$ $Drive was not found."

throw

$\}$

$\}$

$\}$