Why is there only C drive, D drive, A, B in the computer?

In the early days of computers, computers did not have hard disks and optical drives, and people stored applications and files on floppy disks, and started computers mainly by floppy drives. Therefore, a computer often has two floppy drives, i.e., inches and inches, which are defined as A and B drives, respectively. Once you have a hard drive, a

The position of the B drive is occupied, so it can only occupy the drive letter after the C drive in order. If you partition a hard disk or install multiple hard disks, the drive letter will be postponed backwards to drive D, drive, and ...... driveNowadays, floppy disks are gradually being eliminated, A disk is replaced by U disk, and B disk is eliminated early, so usually people can only see the C disk letter and later in the computer.

Quote from Juvenile Not Hooligan.

The earliest computers did not have hard disks, only two floppy disk drives, one floppy drive put the system disk (because the system was very small at that time, it was: ms-dos, which could be read directly to the memory), and the other floppy drive put the work disk, so there were only two drives, A and B, both of which were floppy disk drives, that is to say, A and B were assigned to the floppy drive by the system. That is, the drive letter of the hard disk is from C to Z.

Your computer does not have a floppy drive installed, so there are no A and B disk icons in "My Computer".

In fact, C disk represents the hard disk in storage, the first thing that appeared was the floppy disk of the inch of the disk letter is A, and then B is the floppy disk of the inch, C is the hard disk, D is the U disk, with the gradual elimination of science and technology, it has evolved into the C disk is the system disk, the disk letter of the AB disk is still in the general computer without a floppy drive, it is idle, of course, you can also specify the drive letter.

You can split the disk memory to create a new disk. Take win10 as an example.

1.Open "This Computer" and click "Computer" to enter the "Management" interface.

<>2.After entering the computer management interface, click "Disk Management" on the left to enter the disk management interface. Select an SSD, right-click and select Compact Volume.

3.Enter the amount of compressed space you want for the lead cover in the box, and then click "Compress". （1gb=1024mb）

4.After compression, a new volume will be generated that is "unallocated", right-click and click "New Simple Volume".

5.In the New Simple Volume Wizard, click Next.

6.Specify the volume size by default, and click "Next" to correct the volume.

7.Assign a drive letter to the hard drive partition and click "Next".

8.If you select NTFS for File System, you can name the new volume label and click Next.

9.Finally, click "Finish Huai Li Hao".

That's no partition, it's okay to re-partition the hard disk, reinstall the system after partitioning.