The system cannot find the CD-ROM drive solution _ Hardware Maintenance

Remember to speed up the boot, disable the floppy drive, reopen in the CMOS, the floppy drive is there, but the optical drive is not the same. In the CMOS see the motherboard detects the CD optical drive, I think that must be a system of problems, to the Internet to check the data, found that is likely to be the Device Manager in the IDE ATA/ATAPI controller driver problems, but also remembered yesterday to the driver in the device type changed to No, the original is automatic detection. Transfer mode for DMA (if available) after the change, restart the computer, finally found the optical drive, the problem solved.

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The loss of the optical drive is most often when we install new software or new drivers, or we accidentally modify the CMOS settings or Config.sys configuration, and also because the machine is infected with viruses and so on.

Hardware-related reasons

1. Data cable reverse or data line damage

Sometimes only a small problem, but will be around a large circle, which means that to solve the problem must be forestall, with keen observation. When the optical drive is lost, you should first check the optical drive data cable is connected to the reverse (red and red), whether there is loosening. If you are sure that there are no problems elsewhere and the data cable for the optical drive is constantly moving, you should try replacing a data line.

2. Jumper settings conflict with hard drive

When the optical drive jumper and on the same data line connected to the same hard disk can not find the optical drive (or may not have a hard drive), as long as the CD-ROM drive jumper to the same as the hard disk. To improve the data transfer rate, it is best to separate the hard drive from the optical drive on the two IDE connectors.

3. Power line failure, lack of +5v voltage or +5v voltage power supply is not normal

This is a situation that does not appear much. Because we are too hard to disassemble the optical drive or the hard drive, the power of the D-type plug loose or because of the computer working environment of the bad plug oxidation rust, optical drive power supply is not very normal (if it is hard disk, read disk sounds will be abnormal, and hard disk surface has a large number of bad road appears), the optical drive will also be found.

Once, to the customer's IBM computer host upgrade, install an optical drive. Who knows a new 40 times-fold optical drive installed on the computer will not be found anyway. Optical drive out of the box is normal, also simply think is the power of things, just want to software aspects. Finally did not have, picks up the multimeter one to measure the voltage, does not have the +5v voltage. A check power cord, found that because of many times, the +5v red line has been broken, but in the outside but still can't see out. A little problem but the boss's strength.

4.IDE Interface Damage

If the CD-ROM drive is missing and the optical drive is not available, then we can swap the optical drive and the hard drive interface. If you start again and find that you can find the optical drive, but can't find the hard drive, which means that the original optical drive's IDE interface is damaged, if the swap after the computer can start normally, but still do not have the optical drive, which is the reason for the CD drive itself, at this time can only replace the Anyway, there is not a few money for an optical drive now.

If there is no optical drive under Windows, we can also in DOS (restart the computer after the F8 into DOS, rather than WIN98 under Dos) to try to load the optical drive with WIN98, if you can load success, it is the software aspects of the reasons, should be mainly from the software to find out why. Otherwise, it should be considered from the hardware side.

Software-related reasons

1.IDE driver installation error or conflict with a driver

If we do not install the IDE driver properly at WIN98 or 95 o'clock, or if you see a yellow exclamation mark when you open Device Manager to view the "hard drive controller" When you install it, the drive letter of the time drive may not be found.

Under normal circumstances, when we enter Safe mode, the drive letter will not have. If we want to use the optical drive in Safe mode, we can load the drive in the Autoexec.bat and Config.sys files so that we can use the optical drive in Safe mode after restarting the computer.

There are too few settings in the 2.CONFIG file to set lastdrive quantity

What if we set the "lastdrive=" in the Config.sys file? "is less than the actual number of drives, and even though we have the optical drive installed, I can't see the optical drive shadow in My Computer." Just remove the setting or set it to lastdrive=z.

3.DMA Improper setting

If the optical drive supports only the PIO4 standard and does not support the DMA/33 standard, we force the light to use this standard ("√" in the "set" option in the CD-ROM CDROM property in the "My Computer" attribute in Device Manager). This can sometimes cause the optical drive to lose, sometimes will cause the computer not to start normally. Then we can go into safe mode and remove the DMA settings from the CDROM property. What data transfer mode is specifically supported by the hard drive or optical drive we are using, as we can see in the Basic configuration table of the second screen during the computer startup process.

4. Optical drive in the registration table was malicious shielding off

If someone in the "My Computer" hkey_current_usersoftwaremicrosoftwindowscurrentvrsionpolicesxplorer nodrivers binary value is the value of the optical drive. Normally there is no such item, you can also change the value to 00000000 (01000000 is a,04000000 to c,ffffffff to hide all drives).

Note: Now some viruses specifically change the registry, so that the optical drive letter is lost, so that we are the format of the hard disk, but also installed system. Some viruses will not cause the CD-ROM drive to lose, but will prohibit the CD drive read disk, what kind of disc can not read, but can be started with the CD-ROM.

5. Whether the drive is properly installed

If the driver for the optical drive does not have its own driver installed, the CD-ROM drive loss will also occur. This occurs in general to improve the performance of the optical drive by artificially adding an optical drive accelerator or other program found from the network or CD. Typically, the drive is brought in both WIN98 and 95, and no additional additions are required. You can enter Safe mode to remove the CDROM option in Device Manager, and then restart your computer to allow the system to discover new hardware to reinstall the drive.

6.CMOS Improper setting

If the transfer mode setting is incorrect in the CMOS settings-PIOMODE3 or PIOMODE4 or dma/33 Lao drive will appear in WIN98 or 95 without an icon for the CD drive. At this point, just enter the CMOS integratedperipherais items, Ideprimarymasterpio (or UDMA) and Ideprimaryslavepio (or UDMA) to auto. By the way, if we disable the IDE interface of the corresponding optical drive in CMOS, the optical drive will not be found anyway.

7. Improper use of virtual optical drive

The virtual optical drive avoids the frequent reading of discs, improves the reading speed, and provides the possibility for us to play disc games conveniently. However, sometimes when we do not want to use the virtual optical drive program, want to uninstall it or want to install the latest program, but there was an accident, the virtual CD-ROM disk have, but the actual CD drive letter is not.