I bought a new 30G mobile hard drive, and the result was only 24. 8G, is it normal

Normal, because the manufacturer's calculation method is not the same as the computer's calculation method.

Manufacturer calculation method: 1g=1000m, 1m=1000kb, 1kb=1000b

Computer calculation method: 1g=1024m, 1m=1024kb, 1kb=1024b

It's normal. Because there are two ways to convert between g and m, m and k, and k and b.

One is 1000 and the other is 1024.

The manufacturer is in units of 1000, that is, 30g = 30 1000 1000 1000 = 3 10 to the tenth power.

And the operating system puts 3 10 to the tenth power of bytes 1024 1024 1024

The answer I got was around 27g.

It's actually a little smaller.

It's not normal, it's 30g left, at least change it to more than 27, you see if it's occupied.

Normal. Hard drive manufacturers are based on 1000k 1mb 1000mb 1g

The computer system is 1024k=1mb 1024mb=1g

The system displays, of course, there will be less of it, no need to be surprised, all hard disks are converted like this.

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 and a 160GB hard drive is only 149GB. 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, and 1GB per 1024MB; In terms of computing capacity, hard disk manufacturers use every 1000 as the base, every 1000 bytes is 1KB, every 1000KB is 1MB, and every 1000MB is 1GB.

Normally, the calculation method of the hard disk manufacturer is 1000m = 1g surface, while in the computer it is 1024m = 1g

Normal. It's just why do you still buy 30g now?。。。 The 160g one is also very cheap.

Normally, the stuff of the system takes up a part of the resources.

Normal. All hard disks will be smaller than the theoretical capacity after formatting, as for how small, it depends on the difference of the hard disk itself.

Do not worry..

If your 1TB portable hard drive only shows 32GB capacity, this is usually caused by file system formatting or partition issues. Here are some possible solutions:1

Use the Disk Management tool to view the partitions. Under Windows, open Disk Management and check if the portable hard drive partition is complete. If the partition is incorrect, you can delete it and recreate the bulk partition.

2.Change the file system format. If the portable hard drive uses the old FAT32 Grid, it may only recognize 32GB capacity.

Try reformat the hard drive to NTFS or ExFAT format to support larger disk capacity. Please note that reformatting will erase all the data on your hard drive, please back up your important data. 3.

Update the hard drive drivers. If the portable hard drive driver is old or incompatible, it may cause a disk capacity error. It is recommended that you go to the latest driver from the portable hard drive manufacturer.

4.Check if the hard drive is damaged. If the hard drive is severely damaged, it may result in unrecognized disk capacity.

Try connecting the portable drive to a different computer and see if you can correctly identify the drive's lead capacity. If none of the above methods can solve your problem, it is recommended that you contact the manufacturer of the portable hard drive or a professional computer technical support personnel for further diagnosis and repair.

Because the hard disk manufacturer's definition of the hard disk capacity is different from the operating system's algorithm for the hard disk capacity, there is an error between the disk identification capacity and the actual capacity displayed in the operating system.

Let's compare the standards of the two and actually calculate: The standard of hard disk manufacturers: 1GB = 1,000MB, 1MB 1,000KB, 1KB 1,000byte operating system algorithm:

1GB = 1,024MB, 1MB 1,024KB, 1KB 1,024byte Taking a 40GB hard disk as an example, the calculation is as follows: The standard of hard disk manufacturers: 40GB = 40,000MB = 40,000,000KB = 40,000,000,000KB; Algorithm of the operating system:

40gb=40，960mb=41，943，040kb=42，949,672，960byte；The capacity of the 40G hard drive shown in the operating system is: 40,000,000,000 1024 1024 1024=

Computer system algorithm: 1k=1024b1m=1024k1g=1024m hard disk manufacturer algorithm: 1k=1000b1m=1000k1g=1000m The size of your 320 hard disk is said by the manufacturer, so it is larger than the computer system.

In addition, Lenovo computers will also use a few gigabytes of space as its system recovery partition. Therefore, the memory display has a little error and the deviation is within the normal range.

The unit of recognition in the computer is:

1t=1024g, 1g=1024m, 1m=1024k.

The unit of identification is:

1t=1000g, 1g=1000m, 1m=1000k, therefore: the capacity of a 500g mobile hard disk.

Unit Conversion. After = 500 * 1000 * 1000 * 1000 1024 1024 1024 = 465g

So your portable hard drive shows the actual capacity in the computer as 465g

Due to the different standards adopted.

The unit of recognition in the computer is:

The identification unit of 1t=1024g, 1g=1024m, and 1m=1024k mobile hard disks is.

1t=1000g, 1g=1000m, 1m=1000kTherefore, the capacity of a 500g mobile hard disk is converted to units = 500*1000*1000*1000 1024 1024 1024 1024=465g

So your portable hard drive shows the actual capacity in the computer as 465g

This situation is not caused by the problem of the hard disk itself, nor by the seller deceiving you, but by the different algorithms in the operating system and the BIOS manufacturer.

Due to the different standards adopted.

The unit of recognition in the computer is 1t=1024g, 1g=1024m, 1m=1024k

The identification unit of a portable hard drive is 1t=1000g, 1g=1000m, and 1m=1000k

Therefore, the capacity of a 500g mobile hard disk = 500 * 1000 * 1000 * 1000 1024 1024 1024 = 465g after unit conversion

So your portable hard drive shows the actual capacity in the computer as 465g

This should not be due to the lack of capacity, but the system algorithm is different.

Generally speaking, 1024 is used as a unified unit when the memory is **, for example, 1024m=1g. However, in fact, the internal specification of the computer is 1000 as a unit, that is, 1000m = 1g.

In addition, each independent memory unit (a USB flash drive, portable hard disk, hard disk partition, etc.) will have a part of it stored as its own system files, and these system files cannot be deleted or visible, which will also make the capacity smaller than the nominal one.

Generally, the actual capacity of a good-class storage device should be more than 90% of the nominal capacity. You can do the math yourself and go to the seller if there is a problem.

Feel free to ask.

This is easy to understand. Let's say you buy a 200g hard drive. After partitioning, you will find that there are always a few g's less.

There are many reasons, in terms of hardware, for example, theoretically 1GB = 1024MB. But when the hardware manufacturer is producing,It's me 1g=1000mb to produce,The specific reason is not clear,Many years ago, I also had questions about lz.,Check the Internet,Find out。 Invisibly, a part of the physical storage capacity is missing.

In terms of software, for example, if you buy a 1GB ***, the actual capacity is 1000MB, and then because the system files of *** itself will account for a part. So the songs that can be stored in your hands are more than 900 MB. To put it simply, if you buy a 200g computer, you must at least install an operating system.

Windows takes up a lot of capacity, you look at the hard disk capacity in windows, can the remaining space be 200G?

Back to our car. The theoretical capacity is 30G, and the actual usable estimate is 3000MB. Giving you the freedom to use is.

What about the rest? I observed that these two parts of the space are not common, that is, partitioned. The capacity of a C disk and a D disk can be changed at will, but the D disk is not.

In doing so, it not only maintains the stability of the machine's operation, but also reserves a place for future firmware upgrades and maps.

Nowadays, there are computers at home, and the system is generally installed on the C drive, and then their own things are stored in other inventories. It's the same thing.