Chapter 765: Alternatives to hard drives

When I came the day before yesterday, Lisa helped Qiu Jun to complete the work of making the computer sound. At the same time, he also completed the background music for the booting. Therefore, Gong Ni still respects Lisa and will patiently calm down. Lisa discussed. Without their hard drives, our computers are just a waste, and they can't give full play to their powerful performance. If they are equipped with commercial hard drives, the cost and size are unacceptable.
"Established our own hard drive research and development department, and we started to develop hard drives ourselves. We must not be controlled by others." Lisa said.
Lisa is an image of a capable female entrepreneur. She immediately proposed to develop it by herself. Such a company cannot cooperate in the future, but will crush it!
Others don't know, Lisa knows that, relying on the system in Qin Guan's brain, in this world, only other companies can look at his face, and it is absolutely impossible for him to choke his neck at any time.
The hard drive is left with no way to break through, so let's just make the hard drive ourselves!
"This is not easy." Ni Gong said: "Even if we immediately organize the R&D team, because we do not have any technical reserves, it may take a long time to break through, and our computers can't wait that long."
Delaying delivery as soon as it goes on the market will cause a lot of negative effects, especially if it is sold at such a high price, if you can't enjoy the satisfactory service, your own brand will be destroyed.
Han State does not have any technical reserves of hard disks. Even if Qin Guan exchanged production equipment and did not have skilled operators, it would definitely take time.
Lisa smiled: "During this time, we started the emergency plan and found a replacement for their hard drive."
substitute? What can be replaced? Even Gong Ni is very puzzled.
"Mr Qin, you can tell everyone about it." At this time, Lisa saw Qin Guan walk in, and immediately gave Qin Guan the right to speak.
Others may not think of it, but Qin Guan can think of it.
"Our alternative is to use CDs," Qin Guan said.
This Lisa, who can get in touch with her brain at any time, will naturally know her alternative, yes, it is the CD!
In later generations, optical disks have been popular for a long time, until solid-state storage technology, that is, after the rise of SSD hard disks, when large-capacity U disks have exceeded the capacity of optical disks, optical disks have gradually declined. Like tapes, they have become history.
Compared to tapes that can only be taken out to play, CDs can at least be used as mirrors and block license plates, which is slightly more useful than tapes.
But now, the CD is definitely a rising sun.
The appearance of the optical disc, like the invention of paper, greatly promoted the progress of human civilization. It recorded the development history of human civilization and created a number of emerging industries.
From the perspective of information storage, CD-ROMs can be regarded as a new type of paper. A small plastic disc with a diameter of no more than 12 cm, a weight of no more than 20 grams, and a storage capacity of more than 600 megabytes.
That's right, it is more than 600 megabytes. Compared with the current hard disks with only a few megabytes of capacity, the capacity of optical discs is quite huge. Hard disks use magnetic heads to read the content on the disk, and optical disks are similar to it, except that the writing and reading of information is achieved through lasers.
After the laser is focused, a beam with a diameter of about 1 micron can be obtained. Just like the stylus of a turntable is placed on the disc, this laser beam is the stylus. Therefore, the first application of the optical disc is the audio.
Philips researchers were the first to use laser beams to record and replay information. By 1972, their research was successful and they were put on the market in 1978.
This is the laser video disc (LD, LaserVision Disc) system. Also called LD-laser video disc, this disc has a larger diameter of 12 inches and can record information on both sides. In fact, it is a replica of a record, and the signal it records is an analog signal.
An analog signal is a continuous signal, while a computer uses a digital signal, which is represented by 0 and 1.
This product of Phillips has already come out and achieved success, but it is a pity that it has not formulated a unified standard, making its development and production plunge into expensive capital investment from the beginning.
After all, this equipment came out, there must be a record, the record distribution company thinks this thing is too troublesome for no one to use.
Until 1982, Philips and Sony established the Red Book standard for CD-DA CDs. It first performs PCM (Pulse Code Modulation) digital processing on the analog audio signal, and then records it on the disc after EFM encoding.
This achieved digitalization, and achieved the rapid development of this kind of record.
At the same time, this kind of digital recording also fulfills the basic data storage requirements of computers.
"Now, Philips has developed a laser video disk, but this system is expensive and almost impossible to sell. Therefore, we can buy back their product patents, and then we can digitally transform ourselves. It takes less than a month. It should be able to complete the transfer, save our system to the CD, and install the CD drive on our computer to realize the CD boot."
A boot disk can start the computer and integrate all kinds of software. Just like the installers of the later computer city, a CD will go all over the world.
This is completely a digital revolution.
Of course, there are still many problems to be solved.
This kind of disk can only be read but not written, so as long as the floppy disk is matched, the data needed to be loaded on the floppy disk is the same as the later U disk. At the same time, this kind of optical disk needs to be digitalized.
"There are two important issues, one is to establish a data structure suitable for computer reading and writing; the second is to reduce the bit error rate."
Qin Guan only knows what's inside, but Lisa took Qin Guan's words and continued: "I think we can express 0 and 1 by the degree of disc recession. At the same time, the data on the disc is data Organized in the form of blocks, each block must have an address. After doing this, the data on the disk can be quickly found from hundreds of megabytes of storage space. In order to reduce the bit error rate, an additional error detection and error Correction scheme. Error detection uses cyclic redundancy detection code, the so-called CRC."
Lisa's words were more professional, and Ni Gong's eyes slowly lit up.
The other party wants to jam his neck on the hard drive, but there is no door. Once you have this kind of system, the hard disk will become a tasteless one. Unless the hard disk can reach a capacity of several hundred megabytes, it will not be comparable to the optical disk!
This newcomer Lisa is simply too capable!