The charm of the hottest magnetic memory

2022-08-01
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Magnetic memory charm

introduction: there is still a large market for disk drives, and the market will gradually become larger. Despite the continuous progress of remote communication technology, Mr. gaozhiyu, global marketing director of polyester resin division of Changxing Materials Industry Co., Ltd., introduced that the demand for disk removable high-capacity magnetic storage materials is still large. What is surprising is that the market for high-capacity floppy disks and disk drives based on magnetic materials is gradually expanding. For example, the 100 MB zip drive has become an industry standard. Moreover, Jaz produced by Iomega and SPARQ and syjet produced by syquest also appear in the 1gb~2gb disk drive market. Indeed, as an optical storage material, whether it is CD and DVD that can be used for recording/modifying, Mo, or phase change technology, it has very good data reliability. However, the American magazine publish conducted a survey on its readers. The report shows that readers' demand for high-capacity floppy disks and disk drives is second only to the built-in hard disk drives. According to our analysis, this phenomenon is caused by the low price, high-speed performance and the market itself. In this article, we discuss the current situation of removable high-capacity magnetic storage materials, including some new products. Unreliability magnetic media such as zip, Jaz, or syjet cartridges are more prone to problems than optical media. First, because soft and hard disks store data in the form of magnetic pulses, stray magnetic areas generated from large engines or other devices may erase data like static electricity. On the contrary, the data of optical media comes from the refraction of laser rather than the change of magnetism, so the above problems can be avoided. High capacity floppy drives (such as zip, ls-120, and hifd that we will discuss in this article) and disk drives are close to the edge. The sensitive magnetic read-write head rotates at a high speed within a width less than one hair from the disk recording surface. Vibration and smoke particles or dust can cause the magnetic head to bounce or "collide" on the medium, which is likely to disturb the data. A destroyed head may destroy the disk inserted into the drive. This happens in optical drives, because they use laser beams to read and write data. Price and speed it costs more to buy Optical Drives with similar speed and performance to disk drives. However, the price of 5.2gb Mo drives, such as Pinnacle micro's ultra 5.2 and Sony's smo-f551, which can compete with 2GB magnetic memory, is about $2250 (the 2.6GB mode is stopping production). The 640-mb optical drive, such as the Fujisu dynamo 640, is priced at about $350, which is almost twice the price of the 1GB syquest SPARQ drive, and only half the speed of the latter. However, the price of high-capacity optical media is lower than that of magnetic media. For 640-mb Mo, it costs about 3 cents per megabyte; Sparh 1GB magnetic media costs 3 cents per megabyte. But for 5.2-gb Mo media, about 1 cent per megabyte is enough. In contrast, Jaz 2-gb media costs 5 cents per megabyte. Although this is detrimental to the sales of high-capacity magnetic disks, in the long run, it may be cheaper, with lower media prices and more reliable performance. However, the 5.2gb Mo disk is more widely used in the storage of publications and digital asset management than in the transmission of live parts from the machine to the service center. Mo media generally comply with international standards, so it is usually possible to use Mo drives from different manufacturers to read and write the same media. For removable large capacity magnetic storage materials, it is different because of their poor compatibility. The super dish drive and the new Sony hifd drive produced on the basis of ls-120 can read 1.44-mb standard floppy disks (the products based on ls-120 can also read 720-kb floppy disks). Jaz 2-gb drives readable Jaz 1-gb media. However, all other media are not compatible with each other. Despite so many market constraints, many people are still scrambling to buy cheap disk drives. In addition to the advantages of low price and high speed, the reason for purchasing is that people are always imitating others to buy, which makes magnetic media a common storage material. This opened up market standard has good compatibility. "Early syquest drives were available in many forms. Each merchant had its own drive and required different extensions to the MAC system." Carl Aron, President of DPI service center and design company in Columbia, Maryland, said, "loading syquest disk drives for users is not a unified rule." In contrast, for zip and Jaz disk drives, the most commonly used storage media among advertising design users, compatibility is not a problem. Although the company also invented Fujitsu 230-mb optical drives, most users still buy relatively cheap Zip or Jaz drives. " In fact, magnetic drives have a price advantage. Because price competition is fierce and changing, most sellers do not publish product pricing tables. So our product feature list includes one of the most common off-site prices. The off-site prices of display devices, printing devices and other external devices will fluctuate greatly during the resale process, while the prices of removable storage drives are basically the same during the resale process, and the profits from sales are also very low. Some of the prices are lower than our quotations. That kind of pricing is either for sales promotion or for discounts when purchasing goods. The price and characteristics of different styles vary greatly with technology and performance. This is because different products involve several disk technologies. Floppy disks are generally used for low capacity drives (100mb~200mb) such as zip, ls-120, and newer hifd; High capacity drives are mostly removable hard drives. When a disk is inserted into the drive, the read-write head in the drive can work on the disk. This is different from the removable hard disk drive provided by micronet, megadriver, Mountain Gate, MDI and other companies, including the new shockproof datazbook technology improved by datazone. The read-write head and media disk are installed in a separate removable unit. In order to understand the speed, price and compatibility of disk magnetic storage media, we first briefly describe some key features and specifications of the drive. Then, some special technologies and assembly methods are discussed. When configuring a removable media drive, the first thing users think about is whether it can be connected to their computer. This mainly depends on the interface and configuration of the drive, which has a very broad prospect. Data interfaces, whether SCSI, enhanced IDE (e-ide), parallel port, or USB, can handle data exchange between drives and computers. The drive is either installed inside the computer and connected to the CPU power supply, or a separate power supply is connected to the external interface adapter of the system through a cable. Removable media drives mainly have four types of data interfaces: SCSI -- starting from Mac plus, this interface has become a common connector between drives and external devices. Now the interface speed is faster and faster. The SCSI mode launched by castlewood systems and Iomega company claims that the theoretical speed of ultra SCSI is 40MB per second. Today, the standard SCSI, called SCSI-2, has a theoretical transmission speed of 5MB per second, the maximum speed of fast SCSI-2 can reach 10MB per second, and the maximum speed of fast broadband SCSI can reach 20MB per second. Ultra SCSI is actually a branch of ssi-3, and has become an accelerated SCSI connector commonly used in most storage. E-ide -- this drive interface is used by Intel processor PCs. Currently, all PCs have two internal e-ide connectors (called ide channels). Each connector connects two devices through a shared cable, which theoretically connects up to four devices. E-ide is not as reliable as SCSI, especially when devices share an e-ide cable. The input and output between the e-ide and the connected external devices are very complex. If you want to install multiple removable media drives or both removable media drives and ATAPI CD-ROM drives, you need to check the compatibility of the drives. For example, the win workstation warns that the e-ide zip drive and the e-ide super disk drive cannot be installed on one computer at the same time. The maximum theoretical transfer speed for most drives is 16.6mb per second. Parallel port -- most PCs have no internal SCSI interface, but most PCs sold in the past two to three years have enhanced parallel printer interfaces. These interfaces can also be used to connect external devices such as low-speed storage and scanning. The computer and operating system have many complex functions. Therefore, the enhanced parallel interface can reach the speed of 15MB per second or even faster, but it rarely reaches this speed in practice. Generally speaking, the reliability of multiple connections of parallel interface devices is poor, but the printer transmission is relatively reliable. The parallel port of the printer can be directly connected to this kind of driver without having to be switched on and off manually. USB interface is a high-speed external device interface. One interface can connect 127 external devices. The mouse, keyboard, printer, disk drive and other external devices are installed by the method of hot exchange, plug in and use. There is no need to turn off the computer, toggle the dip switch and patch cord again. At present, the commonly used Apple IMAC has a USB interface, but it lacks a built-in SCSI interface and an expansion interface for SCSI adapters, so it can only connect external devices through the USB interface. The capacity and media price are average. Except for the 2.5-inch disk used in the Iomega click drive, all other disks are 3.5-inch. Merchants weigh the storage capacity of a storage disk (expressed in MB or GB) based on the amount of data that can be stored on a formatted disk or cartridge. Changes in storage capacity lead to changes in media prices. Divide the price of a single piece of media by its storage capacity, and the resulting data is the price ratio per megabyte of storage capacity. The capacity price ratio of low-capacity drives is the highest. Although the competition among manufacturers of high-capacity drives to avoid expanding their shortcomings is very fierce, syquest has a significant price advantage in single-chip media, while castlewood systems' new orb drives use high-density diamagnetic technology, so the media price is 1 cent/megabyte. The lightweight read-write head and simplified mechanical technology can increase the reliability of the driver. Speed problem the speed of the drive depends on three main factors: first, the connection speed between the drive and the computer; The second is the maximum data transmission speed that can be borne, which represents the speed at which the driver reads data from the removable media and transmits the data to the computer. Merchants sometimes give the average speed, minimum speed or minimum maximum speed range to explain this factor. The actual speed parameter item describes the speed at which the drive transfers data from the RAM buffer to the computer processor. Generally speaking, the actual transmission speed is equal to or close to the maximum transmission speed of SCSI, e-ide or other interfaces of the drive. However, the actual transmission speed is not the speed at which the driver reads 100m to find relevant information B image or sound files in the station. Moreover, its fast transmission speed and large capacity disc drive are very useful in temporary storage and professional recording of audio and multimedia video playback. Seek time

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