Why the optical drive does not read the disk

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Optical drive consists of three parts, mechanical parts, electronic components and optical components, which are more complex than ordinary floppy disk drives and hard disks in use and maintenance, and the fault analysis and location are more complicated. The failure of the optical drive usually has interface fault, system configuration failure, optical fault, mechanical failure, electronic fault and other faults in six categories. The general process of troubleshooting optical drives is to first check and exclude the various signal lines connected to the optical drive, power cord, etc.; secondly, it excludes all aspects of the above "other faults", then checks the configuration and parameters of the system, and then examines the factors of optical components and mechanical components, and finally examines the faults of electronic components.

1. Interface Failures

The main reasons for this type of failure are: the optical drive interface does not match the motherboard interface (there is a CDR-103 error), when adding or reducing new hardware, resulting in the optical drive signal line (including other multimedia parts of the connector), power cord, jumper, etc. between the loose, wrong connection or disconnection, and so on.

The specific phenomenon of such failures are "do not recognize" optical drive, "Read and write" error, host crash and so on.

2. System configuration Failure

The main reasons for this type of failure are: I/O, DMA and IRQ conflict after the new hardware has been added to the system, improper setup of the CDROM in CMOS and incorrect master-slave relationship settings for the hard drive.

The specific phenomenon is that the optical drive does not work, the optical drive lights for a period of time after the crash, "read and write" error, do not appear in the letter or false alarm multiple disk characters.

For example, a computer with an optical drive is shared with the hard disk primary IDE interface, after a period of time, according to the motherboard instructions to the optical drive to the secondary IDE connector, found that the optical drive is not working.

Analysis and Processing: Because the CD-ROM is working properly when primary IDE port, it can eliminate the problem of the optical drive itself, considering that the CMOS BIOS is not set after changing the socket, and that the BIOS setting may have influence on the setup of optical drive. The DRIVE1 entry is set to None, so the IDE Drive1 entry is changed to the default value of auto, then the boot, the optical drive works.

3. Optical component Failure

The main causes of such failures are the aging and failure of laser diode and photoelectric receiver diodes, the poor focus performance of the bald head, the laser can not focus on the disc normally, the signal receiving unit can not receive the signal normally, the surface dust of the laser head and focus mirror is too much, the laser

The specific phenomenon is to put the disc without reflection, read the data on the disc difficult, read longer, "Read and write" error, do not recognize the disc, pick disk, panic, prompt "CDR-101" or "CDR-103" error messages.

cdrom bald-head service life is generally 2000-3,000 hours. With the increase in the use of time, the bald power gradually decreased, by adjusting the bald head regulator to increase the bald power of the method, can improve its reading capacity, but this will accelerate the aging of the bald head, reduce the life of the bald head.

For example, a Sony16 speed optical drive, after six months of use, found that the original has been able to use the CD, the vast majority of reading, and show "CDR-101" error. If you repeatedly press the "R" key to try again, you can read some information. In order to locate the fault, we first put a CD in the optical drive and found that the entire disk can be played from beginning to end. This eliminates the drive path and stepper motor and other mechanical parts, electronic components of the fault, the decision is likely to be a laser head failure, resulting in the correct reading of the signal on the disc. So the optical drive is opened, so that the laser head exposed, with a clean silk wrapped in a small stick, stained with a little water alcohol gently wipe the surface of the laser head, and then, in a clean environment to dry, and then the parts by the order installed, loaded back to the computer, the power-on test, found that the CD-ROM work properly, This is a typical optical component failure.

4. Analysis and location of mechanical parts failure

The main reason for such a failure is the mechanical parts wear, damage, displacement and other phenomena resulting in the laser head positioning is not allowed; the pressure plate machinery part has flaws, cannot clamp the disc, causes the disc to rotate erratically.

The specific phenomenon of the tray can not eject, pick, do not recognize the disk, "read and write" errors, more often illegal, compulsory operation, or the environment is worse. For this type of failure, the CDROM mechanical parts can be reassembled, properly compensated for the wear of the parts, adjust the motion accuracy of the mechanism, and install the gasket in the pressure plate shaft hole.

5. Electronic components failure

This kind of fault is relatively rare, the main reason is the CD-ROM optical circuit damage, electronic components aging, damage and so on.

A specific phenomenon is that the optical drive does not work, the letter cannot appear, "Read and write" errors, and so on. This type of failure is usually sent back to the factory repair point or professional repair shop repair. The specific is to replace the corresponding circuit board or components.

6. Other failures

The main causes of such failures are environmental factors, device driver issues (Cdr-101:bead fail prompts), CDROM disk dust, scratches, improper operation, fixed screws too long, maintenance of improper residues or the combination of the above faults and so on.