Even today, some people, especially those who are unfamiliar with computer science, can't comprehend what the question means. Let's start by learning something about "sector markings," since that will help us understand what the question is all about.
A hard drive platter is a metal or glass disc. When you store and retrieve information, the recording head in your hard drive reads and writes magnetic signals onto this surface. Every complete circle of the platter contains raw data formatted in "sectors," which means you can think of it as a "picture" composed of an array of pixels (where each pixel has eight bits). You can then read that picture by using a special process to generate electronic signals that correspond to the zeroes and ones recorded on the platter's surface. That's what makes up your computer's memory banks.
The easiest method to write tracks and sectors on older disks is to use a standard technique. Each track on the disk has either 26 or 17 sectors per track, with each sector containing between 1 and 4 bytes. The number of bytes that a track can contain is determined by where it is positioned in the drive's center and is applied to all other tracks.
To get an idea of how it works, let's look at this example:
Let's say we want to write a sector that contains the number "7" followed by two letters (configured in uppercase) and ended with the number "5." The seven will be stored by using 7 bytes while each letter will take up one byte. The number "5" will also require one byte since it's smaller than the other two digits.
So, to write this string of data, references are made that indicate track 8, sector 5 (you start with 0). This is where you want your writing head to jump for the disk controller to be able to generate the correct electronic signals. To do so, a special type of barcode called an ATIP is inserted into the first and last bytes of each sector on all tracks whenever writing or reading occurs on these surfaces.