If you buy a 120G hard disk, you can only recognize 80G, so can this 80G be used normally?

It can be used normally, so feel free to use it.

Have you tried it with a different partition format!!

Such as: FAT32, NTFS re-divide and take a look!

If your computer is estimated to be PIIII or earlier, it may be that the motherboard does not recognize that large hard drive; If it's a newer computer, you'll have to go to your dealer.

It can be used normally. It's going to be done, and it won't harm the data anyway.

The motherboard and BIOS may not support 120G hard drives, upgrade the motherboard or flash the BIOS, but your 80G hard drive can be used normally.

Is the motherboard and BIOS supported?

But it's better to change it, otherwise you're not losing.

Format it first, then use it, if you still can't recognize 120G, it means that your BIOS does not support such a large hard drive.

Judging by how big is the BIOS, I've encountered this problem, and if you recognize it as 120, it's a problem with the partition.

The motherboard's BIOS should be flashed.

If not.

You'll just change it to a good pull.

If you can use it, you have to exchange it.

Yes, as this is due to the fact that your BIOS is too old, you can fix this by refreshing the BIOS version.

Abnormal. This may have something to do with the motherboard.

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.