The study plan is also relatively simple, tentatively every Saturday afternoon to focus on high school mathematics, physics, chemistry, and English. After passing the exam, you can consider self-study of advanced mathematics, line algebra, and physics.

Based on the textbooks of Xinhua Bookstore, Li Guocheng combined the knowledge of later generations and added some knowledge.

Let's look at Wu Liankui's opinion then, Li Guocheng retracted his thinking into the hard disk design.

The first 4 platters each store 8MB of data, and the 5th platter stores the boot bit, for a total of 32MB of data storage capacity.

The interface adopts 4 sets of differential serial ports, the clock is self-extracted, and the power supply adopts 12V and 5V power supply. 12V supplies power to the spindle motor and 5V supplies power to the circuit board. The interface differential features adopt the RS485 interface standard.

In 1963, IBM introduced the first removable hard drive, the 1311, which had six 14-inch platters with a capacity of 2.6MB and looked like a Xiaoice box.

This is the gap of the times, Li Guocheng has the experience of later generations, the subtle mind, the dedicated integrated circuit, and the low-power bus mechanism, so he can design a smaller volume and larger capacity of the hard disk.

Considering the stability of operation and heat dissipation, the shell of the whole machine is manufactured by the process of mold casting aluminum. In order to reduce the weight of the magnetic head, the magnetic head arm is made of aluminum alloy + thin steel sheet, and two parts need to be molded, one for pouring and the other for stamping.

It only took two days for Li Guocheng to complete the mechanical structure design of the entire hard disk in his mind, but it took 2 weeks to transform it into a blueprint.

"Xiao Zhou, this is a full set of drawings of the mechanical structure and external interface of the hard disk, and there is a lack of control circuits, and these reserved mounting holes are the locations where the circuit board is placed."

Li Guocheng pointed to the design drawings and explained them to Zhou Xiaojuan one by one.

Zhou Xiaojuan looked at the size on the drawing, "This is too fine, how can we produce it?" But the whole hard drive is so small and beautiful."

A girl's perspective is always so novel. Because Li Guocheng has explained to everyone the current commonly used storage methods, as well as the size, Zhou Xiaojuan was deeply shocked as soon as she saw the drawings, not Li Guocheng's successful experience in the past, she doubted the possibility of realization.

Li Guocheng turned over the mold drawings, "These drawings are all kinds of molds, you ask Wang Gong or Master Yi, can we produce them?" If it's difficult, you get the materials and I'll do it myself."

Zhou Xiaojuan has no objection to this, Li Guocheng is a humanoid precision lathe, and it is a multi-axis linkage precision lathe. Thinking of this, a thought suddenly popped into her.

"Brother Li, when will you make a 4-axis linkage CNC machine?"

Li Guocheng was stunned when asked, this also changed too quickly, "When we complete the computer design, we can consider setting up a team to cooperate with Wang Gong to design CNC machine tools."

"Hey, we're talking about hard disk drawings, why did you run to the CNC machine. You can take a look at these drawings first, and if there is any problem, you will come to me again."

"Hee-hee, got it, Brother Li".

Next, the design of the special chip for hard disk, because there is a basic understanding of the interface standard, the design is simplified according to his understanding and the current circuit implementation ability, the total interface speed is only 20Mbps, but it is several times faster than all the current external buses.

Another week passed, and the design of the special chip for the hard disk was completed, and at the same time, the circuit board was also completed simultaneously. Li Guocheng handed over the two masks of the chip and the circuit board and the design data to Zhou Xiaojuan.

"Brother Li, you're too fast", Zhou Xiaojuan shouted, and the people in the room all looked back at the two of them, and the experienced ones were secretly smiling.

In the office of this era, men get together and always love to drive, especially Wang Dayong, who always laughs at others heartlessly.

Li Guocheng's face was black. Zhou Xiaojuan realized that something was wrong, and hurriedly apologized for her shouting and screaming.

Li Guocheng knew that she was unintentional, "Xiao Zhou, arrange production as soon as possible, and mention it if you have difficulties."

"Brother Li, Master Yi, they feedback that the mold is too delicate, they can't do it, and the materials will be sent to you in a while."

"Okay", Li Guocheng turned to leave.

Zhou Xiaojuan is now under a lot of pressure, and Li Guocheng completed the design of the structure, chip and circuit board in less than a month, and they have just made progress so far.

Based on past experience, the chips and circuits designed by Li Guocheng were basically a success, and in the case of enhancing their confidence, they invisibly set a benchmark for the chip manufacturing industry, and when they were later exposed to the chip design process of other companies, they realized how perverted Li Guocheng was.

Li Guocheng has now returned to his family, and Zhao Ting may give birth at any time. Although Zhao Ting felt that she could still go to work, Li Guocheng resolutely disagreed and had to succumb, but her heart was beautiful.

The mother-in-law and grandmother prepared a lot of diapers, which were used before, saying that they were used to protect the child's skin. Li Guocheng smelled the smell of camphor on the diaper, and he was really relieved.

Take out a large iron pot, throw all the diapers that have been washed in clean water into the pot, boil the water for 10 minutes, and then spread out the diapers and hang them on the clothes wire in the yard.

The diapers that were still steaming just now didn't take long to become hard. Today, it is rare that only a breeze is blowing, and the warm winter sun is shining on diapers, and I believe that it can be sterilized.

After observing for a while, Li Guocheng is now a little square, whether the diapers frozen into borneol can absorb the heat of the sun, and whether there will be a taste of the sun after drying.

In the afternoon, when the wind became much stronger, Li Guocheng hurriedly received all the 'dried ice chips' into the living room, stacked them together, and hung them next to the fire. I sat by the fire and watched the diapers dry, and before dinner, the side near the stove was dried.

When the nose is close and you inhale hard, it smells of water vapor. Li Guocheng rubbed his nose, walked to Zhao Ting's side and sat down.

For a whole day, all of Li Guocheng's behaviors were seen by the three women in the family (mother-in-law, Aunt Liu and Zhao Ting), and the kind of focused (silly) expression in their eyes made them often laugh in the house.

When Li Guocheng sat next to Zhao Ting with a depressed expression, Zhao Ting almost gave birth to a baby.

Frightened, Li Guocheng hurriedly helped her to calm down, "What's wrong with you?" ”

As soon as the words fell, Zhao Ting covered her stomach and sighed, her face began to smile, but now it has turned into a painful expression.

The experienced mother-in-law had a simple examination and immediately urged Li Guocheng to send Zhao Ting to the hospital.

At 9 o'clock in the evening of the same day, a little girl of 7 catties and 2 taels was born, and the faces of the three women who knew the result were a little unnatural, but Li Guocheng didn't care at all, his whole mind was immersed in the little daughter's body, and he never left.

Looking at the villain with wrinkled skin and slightly reddened, Li Guocheng's heart melted. The daughter is the little lover of the father's last life, and the daughter is the father's little padded jacket.

Seeing Li Guocheng happily touching the little guy there, the three women finally slowly showed their smiling faces.

Thank you all for your support!! Ask for recommendations! Ask for a commuter pass! Ask for a review!

(End of chapter)