Hard disk read and write speed slow cause analysis chart

What is the reason for the slow read/write speed of the mechanical hard disk?

There may be many reasons why mechanical hard disk read/write speed is slow, the following are some common reasons:

Hard disk aging: mechanical hard disk after a long period of time, there may be aging phenomenon, resulting in slower read/write speed.

Hard disk failure: Although the hard disk test did not find bad sectors, but the hard disk may also have other failures, such as head failure, resulting in slow read and write speeds.

Operating system problems: There may be some problems with the operating system that cause slower read/write speeds, such as virus infections, software conflicts, and so on.

Data cable problem: Although you have replaced several data cables, there is still a possibility that the quality of the data cable is poor, or the cable is incompatible with the motherboard or hard disk, resulting in slow read/write speeds.

Other problems: such as motherboard problems, power supply problems, etc. can cause the hard disk to read and write slowly.

It is recommended that you try the following:

Replace the hard disk: If the hard disk is aging or malfunctioning, you need to replace it.

Checking the operating system: You can check for viruses with antivirus software or solve the problem by reinstalling the system.

Checking the data cable and interface: you can replace the data cable or check if the interface is loose.

Check the power supply and motherboard: If none of the above methods can solve the problem, you need to check the power supply and motherboard for problems.

Finally, if you still can’t pinpoint the problem, we recommend you consult a professional for testing and repair

Why are computer mechanical hard disks so slow?

There may be several reasons for the slow read/write speed of a mechanical hard disk:

Disk fragmentation: After using the hard disk for a long period of time, the files may be scattered in different areas of the hard disk, which results in the need for the magnetic head to move between the different locations, thus reducing the read/write speed. You can organize your hard drive with a disk defragmentation tool to improve read and write speeds.

System resource usage: If your computer is running a lot of background programs and services, they may take up a lot of system resources, resulting in lower read and write speeds to your hard drive. You can check the task manager to see if there are any highly occupied programs and try to close or optimize them.

Driver issues: Outdated or corrupt hard drive drivers can cause your hard drive’s performance to degrade. Check your hard drive drivers to make sure they are up to date and update or reinstall them as necessary.

Hard drive aging: Hard drive performance may degrade over time as the drive is used, which may also result in slower read and write speeds. If the hard drive has been in use for a long time, you may want to consider replacing it with a new one.

Hard drive interface issues: The type of interface and transfer rate of the hard drive may limit the read and write speeds of the drive. For example, older SATA interfaces may be slower than newer generation SATA interfaces. In this case, upgrading the hard drive interface may help improve hard drive performance.

BIOS settings: Check your computer’s BIOS settings to make sure the hard drive mode is properly set to AHCI mode (and not IDE mode) for better performance.

Virus or malware: Viruses or malware can affect the performance of your hard drive. Run an antivirus program to scan your computer and make sure your system is not affected by viruses or malware.

If the above reasons are ruled out, but the hard drive is still slow to read and write, you may want to consider replacing the hard drive, especially if it has been in use for a longer period of time. Also, consider upgrading to a solid-state drive (SSD), which typically have faster read and write speeds than mechanical hard drives.

What’s wrong with a slow read/write speed of a solid state drive?

There are several possible reasons for the slow read and write speeds of SATA-interface SSDs:

Older SATA interface version: If your computer or motherboard uses an older version of the SATA interface (e.g., SATAII or SATAI), its data transfer rate may be slower, thus affecting the read and write speeds of the SSD.

Problems with the SSD itself: Some low-quality SSDs may have some problems during the design and manufacturing process, such as mismatched chipsets and unrefined manufacturing processes, which can lead to slower read and write speeds.

Problems with system and drivers: If there are problems with your system and drivers, such as not installing the drivers correctly, having too low a driver version, etc., it can also affect the read/write speed of the SSD.

Problems with other hardware: In some cases, other hardware devices may also cause slower read/write speeds for SSDs, such as the chipset of the motherboard, CPU, memory, etc.

In summary, if your SSD read/write speed is slow, you can check each of the above aspects to find the problem and try to solve it.

Why is my SSD reading and writing slow

There are several reasons for this problem:

1, lagging caused by unstable reconnection of the network;

2, problems with the SSD.

3, too much fragmentation of the disk

4, hard disk bad sectors.


The slow speed of the hard disk may be due to too many cache files and some temporary files of the computer disk, too many files of the computer disk will lead to the hard disk’s running speed slow, so it is best to carry out the cleaning of fragmentation files regularly.

If you visit a website that has a virus, it can also slow down your hard drive, because viruses can destroy system files and slow down your hard drive, so you need to get rid of the virus or get a new hard drive.