Why does the capacity of a computer s hard disk become smaller after formatting?

The memory of the system is calculated according to the calculation method of 1g=1024m, 1m=1024k, 1k=1024b, and the external memory is 1g=1000m, 1m=1000k, 1k=1000b, and the calculation method of the system's memory after formatting, of course, the capacity becomes smaller, and if the disk has bad sectors, it also becomes smaller after formatting.

It has a lot to do with what tool you use to format it. First of all, the capacity of the hard disk belongs to the physical capacity, that is, it is fixed and cannot be modified with software. According to my analysis, it is very likely that you formatted it with the system disk, and the partition of the system is not well divided, resulting in the remaining space.

The format can affect the size of your hard disk, such as using NTFS format may be smaller than FAT32, and the actual size of the nominal 320G hard disk is much smaller, I hope it can help you.

All hard disk manufacturers recognize 1g = 1000m, let me give you an example, so their 160g 16000m

In the system, 1G 1024M so the 160G hard disk is formatted out to be 156G

So in the past, some people in the United States sued some hard drive manufacturers, saying that they deceived consumers, but they did not win the lawsuit.

After formatting, there are still system files stored in it.

Those are going to take up memory.

If you want to recover the memory, it's best to go into the disk system and clean it up.

If. Not much smaller.

It's a format change!

The beginning may be.

Post fat or.

fat32 this.

2 pcs. Format.

The system does not play. ntfs

Comparatively large. The capacity is relatively stable.

Formatted capacity refers to the capacity of disk and optical disk storage that can be provided to users to store data. It is expressed in bytes. The general calculation is:

Formatting capacity: number of bytes in two sectors x number of sectors per lane x number of tracks per surface x number of faces. For example, the formatted capacity of each inch of high-density floppy disks is commonly used = 512 x 15 x 80 xz = 1 228 800(b) = 12(mb)。

Before storing data, it is formatted whether it is a hard disk, a floppy disk, or an optical disk. According to the requirements of the operating system used to store data, the disk or optical disc is divided into sectors, and the address symbol, address, check code, synchronization code, etc. are written in front of each sector, so that they can be addressed when accessing. At the same time, in order to prevent the overlap of the head and tail caused by the change of rotational speed, there is still a certain byte gap at the tail of the sector.

They all take up some storage space. Generally, the formatted capacity is 10% to 20% smaller than the unformatted capacity.

Unformatted Capacity: Unformatted Capacity = Number of Recorded Faces * (Number of Tracks per Face * Inner Circle Circumference * Maximum Bit Density).

On the computer's hard drive, there is a special cache area, and the size of this area will not change. Unless the memory chip is damaged, but if the memory chip is damaged, the hard drive will not be used. Depending on the brand and model of hard drive, the size of the cache area is also different, which is one of the key factors that determine the quality of a hard drive.

The read and write speeds of the cache are much higher than the read and write speeds of the hard disk itself. It's comparable to the memory in your computer.

In addition to the cache, the most important thing in the hard disk is the capacity. The so-called capacity refers to the space, storage space, hard disk, and function in the computer, which is equivalent to a factory warehouse, the larger the warehouse, the more things can be stored, but the computer hard disk is stored in the data is not an entity. If the hard disk is not managed for a long time, its storage space will only get smaller and smaller, and when a large number of file operations are not carried out, the storage space suddenly becomes smaller, which is likely to be caused by a virus, which is also a kind of data, or a kind of software.

It's just that it does it with malice, and it will continue to strengthen itself, so that it will become bigger and bigger. Takes up a lot of disk space.