Floppy Disk ispersonal computerThe first removable media in (PC).The floppy disk is read and written throughfloppy disk driverCompleted.The floppy disk drive is designed to accept removable floppy disks. The commonly used floppy disk is a 3.5-inch floppy disk with a capacity of 1.44MB. It was once popular.Later due toUSB driveThe application of floppy disk gradually declined until it was eliminated[1]。
In 1967,IBMThe company launched the world's first floppy disk with a diameter of 32 inches.Four years later, IBM launched another 8-inch diameter surface coated withmetallic oxideAllen Shugat (later left IBM to found Seagate), who announced the development of 5.25-inch floppy disk in August 1976.1979SonyThe company launched a 3.5-inch double-sided floppy disk with a capacity of 875KB. By 1983, it had reached 1MB, which is often referred to as a 3-inch disk[2]。
The floppy disk is read and written throughfloppy disk driverCompleted.The floppy disk drive is designed to accept removable floppy disks. The commonly used floppy disk is a 3.5-inch floppy disk with a capacity of 1.4MB.floppy diskAccess speedSlow, small capacity, but can be loaded and unloaded, and easy to carry[2]。
Size storage
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Floppy disk is personalComputer equipmentMedium, first to use removable backupstorage device。Floppy disks can be divided into eight inch, five and one-quarter inch, and three and a half inch. They are divided into hard magnetic area and soft magnetic area.The floppy disk is coveredMagnetic coatingPlastic sheet for storagedata file[3]。
floppy disk
DisketteStorage format: refers to how many concentric circles are divided on each side of the discTrack, and how many stored informationa sector。Sectors are the basis of floppy disksStorage unitEach read/write to the disk is performed in several sectors called "clusters"[3]。
type
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There are many kinds of computer floppy disks on the market, including 5.25-inch floppy disks and 3.5-inch floppy disks, commonly known as 5-inch floppy disks, 3-inch floppy disks or large floppy disks,Small disk。The symbols on the disc generally include DS, DDHDEtc.DS means double-sided;D indicates low density;HD meanshigh-density。Note: Low densityfloppy disk driveHigh density floppy disks cannot be read or written, while high-density floppy disks can read or write low-density floppy disks[4]。
organization structure
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The floppy disk must be formatted before use. After this process, the disk is divided into severalTrack, each track is divided into severala sectorEach sector stores 512 bytes.Tracks are a groupConcentric circleA track is about a few tenths of a millimeter wide, and data is stored on these tracks[5]。
A 1.44M floppy disk has 80 tracks, each track has 18 sectors, and both sides can be usedStore data。We calculate its capacity as follows: 80 × 18 × 2 × 512 ≈ 1440KB ≈ 1.44MB[5]。
The size of the file is expressed in bytes, but it is stored in clustersAllocation unitThat is, a cluster cannot contain the contents of two files. That is, no matter how small a file is, even if it has only one byte, once it occupies a cluster, other files cannot be written to the cluster. That is, other unused space in the cluster is wasted[5]。
floppy disk
Each cluster is composed of one or more sectors. For a floppy disk, a cluster has only one sector, that is, 512 bytes;For hard disks, the cluster size andHard disk partitionSize. The larger the partition capacity, thesector numberThe more.For a file containing 5 bytes, it will occupy at least 512 bytes on the floppy disk and more on the hard disk[5]。
It is a good method to back up data with floppy disks. If the method is correct, they can be saved for 5-8 years.When using a floppy disk, be careful not to scratch the disk. The disk should not be deformed, exposed to high temperature, damp, or closeMagnetic materialwait[5]。
Tips
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1. Do not touch the floppy disk surface, because it mayAbrasionsFingerprints are left on the surface or due to finger contact, dust is stuck and mildew occurs.Light causesheadIf the distance from the disk surface is increased, the reading and writing are unreliable, or the disk surface will be scratched and the floppy disk will be scrapped[6]。
2. Do not use when writing marksball penOr a hard pencil, because it will scratch the surface of the floppy disk, causing reading errors.It is best to use a soft pencil to write the mark[6]。
3. Don't useeraserWipe the words on the label, because the debris dropped during wiping may enter the floppy disk, causing the floppy disk andDriverAbnormal operation, even damage[6]。
4. When using labels, the relevant storage contents, titles, etc. shall be written on the labels first, and then pasted on the top right of the enclosure.Can'theadWindow orCentral holeAnd index holes, otherwise, the floppy disk cannot work properly.When replacing a new label, you should tear off the old one and stick a new one, so that the floppy disk will not thicken and affect the insertion of the drive[6]。
5. Do not press heavy objects on the floppy disk. Otherwise, the floppy disk may be deformed, causingPermanentdamage[6]。
6. The floppy disk cannot be directly exposed to the sun because the PVC sealing cover will deform due to high temperature, which will cause the floppy disk to fail to record normally[6]。
7. Not availableCliporelasticBundle the floppy disk. When storing the floppy disk, it must be put into a special box to prevent damage to the cover or media[6]。
8. During operation, the environment must be clean, and smoking and drinking are not allowed to avoid polluting the floppy disk[6]。
10. The floppy disk should be stored correctly.Usually, several or ten pieces are placed vertically in a paper tray or an appropriate rack, not horizontally overlapped[6]。
11. Do not put the floppy disk on the magnetradioNear TV sets, motors and transformers.Because these objects will generate magnetic fields, which will cause damage to the information on the floppy disk[6]。
12. If the floppy disk has been stored under high or low temperature, it should be placed under normal working environment for 5 minutes before use,ReinsertDrive working[6]。
floppy disk
13. Using the newly purchased floppy diskStore informationIt must be formatted before, otherwise, the information cannot be stored[6]。
Common fault handling and analysis
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The common failure of a floppy disk is that it cannotBoot system, reading/writing is abnormal, and only the self formatted disks can be read（InterchangeabilityPoor), the main reasons and solutions are as follows:[8]
Status detectionsystem failure : Remove foreign matters or cleanPhotodetectorReplace the damaged parts and try to determine the specific fault position of the circuit.
Shopping Guide
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Check appearance
After you get the floppy disk, you should first check whether the shell of the disk is well processed, then pull apart the metal or plastic sheet by hand, and observe the surface of the disk in the bright place: the surface of the high-quality disk is smooth, uniform, free of scratchesMildew spot；If twills or countless obvious circles can be seen, the quality is poor;If obvious defects and damages can be seen, this floppy disk is almost unusable[7]。
Brand identification
Low quality floppy disks are generally counterfeit products.Therefore, users must pay attention when purchasing floppy disksFamous brand productsCounterfeit goods in.The popular floppy disks in the market are mainly as follows:[7]
① 3M floppy disk made in the United States, Japan or South Korea. This kind of floppy disk has good mold proof performance and has a large sales volume in China, but there are many smuggled goods and it is difficult to distinguish[7]；
② JapanWan ShengandSony's floppy disk is of good quality and very popular. It sells a lot in China, but there are many counterfeiters[7]；
③ Japan TDK plate, good quality, small sales volume and few counterfeits[7]；
④ The Weibo plate in the United States is of good quality and has four functions of antifouling, waterproof, mildew proof and anti-static. There are few counterfeit products;At present, the quality and stability of domestic floppy disks are completely comparable to that of foreign floppy disks[7]。
Floppy disks are indispensable in work, but they are also easy to break down.In practical work, it often happens that the floppy disk cannot be read or written, and even the formatting operation cannot be carried out.If the floppy disk is damaged due to improper use, the files or data stored on the disk may be lost. If important files or data on the previous disk are not backed up, irreparable loss will be caused to the work[7]。
