There is a problem with the hard disk, and 80G detects 120G

EasyRecovery is a software that doesn't have a very small chance of recovery from basic ordinary software.

There are other recovery software that should be pressed, but none of them are good, I have recovered 92% of the data with easyrecovery, you can try it.

About becoming 120g, it may be because the original capacity of your hard drive is 120g, and the 40g is blocked before leaving the factory to become 80g, which is a strategy of the manufacturer, to reduce costs, you accidentally open it, and at the same time the data is lost.

If it doesn't work, you can only find a professional hard drive repair, which is a bit expensive, but there is no way.

Make a backup of the hard drive and see if you can format the hard drive, if not, your hard drive is hanging.

So important -

Maybe the hard drive is broken, it is recommended to be on the safe side, take the hard drive to a computer company, and use professional equipment to read the data inside.

It should be a CPU external frequency problem in BIOS, just tune it back by yourself. Maybe whoever adjusts yours up, and if you don't turn it back, it's easy to damage the motherboard and other related accessories!

Something went wrong with the hard drive. If you have any important data in your hard drive, you can ask the one who did the data recovery. I advise you yourself not to just talk about recovery.

Hang it from the disk or PE into the system to see if the partition can be opened, if there is no very important data compartment anymore, then use data recovery software to recover it.

Take out the hard drive and try it on another computer.

When a laptop hard disk fails, it will be manifested as a failure to read data and fail to identify the hard disk. If failures do occur, how do we determine the cause of them?

1.The hard disk does not respond after powering up.

When we plug in the power and boot up the laptop, we find that the hard drive does not respond and the hard drive cannot be found in the BIOS. If this happens, it is mostly due to a problem with the hard drive motor. At this time, we should find a professional maintenance personnel to carry out the repair.

2.The hard drive makes a "click" sound.

When the laptop hard drive makes a "click" sound or other abnormal sounds, it means that there is a problem with the head. At this time, we should immediately turn off the laptop and take it to a professional repair location for repair. Otherwise, your precious data will be gone.

3.Data cannot be accessed and data cannot be copied.

When we enter the operating system, we are able to see the data on the hard drive, but we cannot access the data, and we cannot copy and paste the data. In this case, it can basically be determined that there are bad sectors on the hard disk, or there may be a problem with the hard disk firmware. We can use the software to check the bad sectors to test whether the hard disk has bad sectors.

4.The hard drive is functioning properly and the BIOS cannot detect it.

When we boot up the laptop, the hard drive is not detected in the BIOS, however, the hard drive works fine. This situation is basically caused by firmware issues, and it is also possible that the hard drive initialization information is missing. If this happens, the data is largely irretrievable.

5.Misidentification of the hard disk.

When we are using a laptop, we find that the laptop hard drive detected in the BIOS is different from the actual hard drive. This situation is caused by the offset of the hard disk head, or it is possible that there is a problem with the hard disk firmware, which causes the hard disk to be misidentified.

Can you install a system? It shouldn't be unrecognizable.,If it's "you can install the system.,But you can't boot windows from the hard disk",It may be the reason why you don't set up an active partition.,Method yourself.。

In addition, the 40G hard disk is a PATA interface, if your 250G hard disk is a SATA interface, check whether the SATA port in the BIOS is set to AHCI mode, if so, change it to IDE to try. If the motherboard is older, it may also be the reason why SATA2 is not supported, you can force the hard disk to work in SATA mode, and try to see the indication on the hard disk by yourself, usually to connect the jumper.

Can't recognize the hard drive in the BIOS can't be seen? I can't recognize what do you mean by "hard disk can be installed in a working system"? Check if the motherboard supports it? Considering flashing the BIOS is not supported. If there are no motherboard issues, line and hard drive failures are considered.