Next Train: Disk Boot Failure

It’s been years since I saw a computer screen like this! I saw this in one of the information screens in Jurong East MRT. Apparently this screen is hooked up to a computer with AMD K6-2 processor (running at 300 MHz) and 16MB RAM memory. The computer’s hard disk has failed, causing it to display the message “Disk Boot Failure, Insert System Disk and Press Enter.” Now, where do the train passengers find that System Disk?