Why is the hard disk used less, and the hard disk is used a lot but the time is very little?

On the one hand, there are a lot of junk files, and on the other hand, it may be that the hard disk restore function is enabled.

There is a lot of garbage and it is not removed.

Turn off System Restore or.

Clean it up with Super Bunny or Optimizer.

Or there are hidden files in the system, just open a folder, and the tool Folder Options View shows all files and folders. If you still don't have one, run the cmd program and use the dos command attrib -s -h to restore the hidden files.

Defragmenting and checking for errors is time-consuming...

For example, in the C drive, open the C drive properties - there is it in the tool.

If the hard drive has bad sectors, it should be repaired or replaced with a new hard drive.

Turn on and turn off even once.。。

One of the fatal problems with traditional hard drives is that they need to drive the motor to rotate the platter, which will cause a very serious disk read delay! Think about it, you have to know which sector the data is on, and then the pure source then commands the motor to start spinning, and then you have the head read the correct data. In addition, if the data placement is more discrete (the fan division is wide and discontinuous), then the delay in reading and writing will be more obvious!

The speed can't be fast. Therefore, some manufacturers later used flash memory to make large-capacity devices, and the connection interface of these devices is also through SATA or SAS, and the curved type of Zen pants is also done the same as traditional disks! So, although this kind of device can no longer be called a disk (because there are no heads and platters!).

It's all memory! )。But for the sake of everyone's convenience, it's still called disk!

However, unlike traditional hard disk drives (HDDs), they are called solid state drives (solid state disks or solid state drivers, SSDs). The biggest advantage of SSDs is that they don't have a motor that doesn't need to be rotated, but can be read and written directly through memory, so in addition to being fast and free of data latency, it also saves power! However, early SSDs have a very important fatal flaw, that is, these flash memories have a "limit on the number of writes", so usually the life of SSDs is about two years!

Therefore, when storing data, you need to consider backup or may use RAID mechanism to prevent SSD damage!

The problem with traditional hard drives is slow read and write speeds.

The magnetic disc of the hard drive is made of a hard material and has a high degree of precision. The hard disk is enclosed in a case along with the drive, and it has a much larger capacity than floppy disks and optical discs, and the read and write speeds are much faster than floppy disks and optical discs.

A hard disk is a platter set consisting of several hard disk slices around a common axis, leaving only the distance between the two platters to place the head. Each platter has two discs, which are divided into many concentric circles, called tracks. These concentric circles are different in circumference, but the storage capacity is the same.

Each track is divided into a number of regions, each called a sector, and each sector stores 512 bytes of information. In hard disks, the collection of the same track number on several platters is called a cylinder, and these tracks have the same direction of rotation of the magnetic field. Each disk faces one head, but now hard disks, two heads can read one platter.

Therefore, the capacity of the hard disk is determined by the number of cylinders, the number of disks, and the number of sectors per track. The capacity of the hard disk is equal to the number of cylinders multiplied by the number of disks multiplied by the number of sectors of each track multiplied by 512, generally in GB, TB as a unit, many hard disk manufacturers calculate GB and TB when it is decimal, 1GB is 1000MB, 1TB is 1000GB.

The inside of the hard disk is composed of magnetic storage discs, the number varies from one to three, each platter has a certain capacity, called a single disk capacity, and the sum of the capacity of several platters is the total capacity of the hard disk.

The spindle motor of the hard disk drives the platter to rotate at high speed, generating buoyancy to make the head float above the platter, and the hard disk reads the data on the platter through the head, the faster the speed, the shorter the data reading time. The rotational speed largely determines the speed of the hard drive.

The time it takes for the head of a hard disk to move to a specified track on the disk is called the average seek time, measured in milliseconds, and the smaller the time, the better.

The data transfer rate is the rate at which the computer accurately finds the corresponding data from the hard disk and transmits it to the memory, including the internal data transfer rate and the external data transfer rate, which is measured by the number of megabytes that can be transferred per unit of time. The interfaces of hard disks include IDE interface and SCSI interface. Since the hard disk is fully enclosed and fixedly installed, the hard disk drive is also fixed together and installed in the main chassis, which is not visible from the outside of the main chassis.

The biggest problem with traditional hard disks is that the read and write speeds are slow, especially the random read and write speeds.

It doesn't have any effect.,It's good to classify and store files by yourself with more partitions.,It's not so convenient to find things if there's less.。

After buying a hard drive, careful people will find that the capacity of the hard disk in the operating system does not match the official nominal capacity, it is less than the nominal capacity, and the larger the capacity, the greater the difference. A hard drive with a nominal 40GB is only 38GB in the operating system; An 80GB hard drive is only 75GB; A 120GB hard drive is only 114GB. This is not caused by manufacturers or distributors deceiving consumers with shoddy products, but by the different calculation methods of hard disk manufacturers and operating systems, and by different unit conversion relationships.

As we all know, binary is used in computers, so that the calculation of capacity in the operating system is based on 1024 as a base, 1KB per 1024 bytes, 1MB per 1024KB, 1GB per 1024MB, and 1TB per 1024GB; In terms of computing capacity, hard disk manufacturers use every 1000 as a base, 1KB per 1000 bytes, 1MB per 1000KB, 1GB per 1000MB, and 1TB per 1000GB.

Take a 120GB hard drive as an example:

Manufacturer capacity calculation method: 120GB 120,000MB 120,000,000KB 120,000,000,000 bytes.

Converted to operating system, 120,000,000,000 bytes 1024 117,187,500kb 1024 114,.

Simple algorithm: hard disk capacity.

Hard disks need to be partitioned and formatted, there are differences between operating systems, coupled with the behavior of copying files when installing the operating system, the hard disk will take up more space, so there will be a difference between the hard disk capacity and the nominal capacity displayed in the operating system, and the difference between the two types of hard disk capacity should be about 5%-10%.