checkRetCode ()
{
	lstRetCode=${?}
	lineNo="${1}"
	
	if [ ${lstRetCode} -ne 0 ]
	then
		echo "Last command returned and invalid code: [${lstRetCode}]. Line number: [${lineNo}]."
		exit 1
	fi
}

processUsbDev ()
{
	usbDevName="${1}"
	baseMountPoint="${2}"
	numDirs="${3:-999}"
	numRetries="${4:-3}"

	usbDev="/dev/${usbDevName}"

	echo "Formatting usb disk: [${usbDev}]"
	mkfs.vfat -F32 "${usbDev}"
	checkRetCode "${LINENO}"

	mountPoint="${baseMountPoint}/${usbDevName}"
	if [ ! -d "${mountPoint}" ]
	then
		mkdir "${mountPoint}"
		checkRetCode "${LINENO}"
	fi
	
	echo "Mounting disk: [${usbDev}] under: [${mountPoint}]"
	mount ${usbDev} ${mountPoint}
	checkRetCode "${LINENO}"
	
	countDirs=1
	echo "Creating directories under: [${mountPoint}] - [${countDirs}][${numDirs}]..."
	
	while [ ${countDirs} -le ${numDirs} ] 
	do
		countDirStr=`echo "${countDirs}" | awk '{printf("%03d\n", $0)}'`
		createDir="${mountPoint}/${countDirStr}"
		
		countRetries=0
		while true
		do
			mkdir "${createDir}"
			retCode=${?}
			if [ ${retCode} -ne 0 ]
			then
				if [ ${countRetries} -ge ${countRetries} ]
				then
					echo "Failed to create directory: [${createDir}]!"
					break
				fi
			else
				break
			fi
			countRetries=`expr ${countRetries} + 1`
		done
		
		countDirs=`expr ${countDirs} + 1`
	done
	
	umount ${usbDev}
	checkRetCode "${LINENO}"
}

echo "Press any key to start!"
read

processUsbDev "sdc1" "/media/usb" "999" "3"