Precautions when Handling CD-RW
Before referring to the precautions for using CD-RW discs, first consider the structure and recording methods of the CD-RW.

CD-RWs do not differ greatly from audio Compact Discs or CD-ROMs (referred to henceforth as CDs), in that they make use of a plastic substrate measuring 1.2mm in thickness, and are formed of four thin layers that include a recording layer. The top layer is the protective layer. It is normal for the label printing to be performed on this layer as a part of the CD-RW structure. Even with these thin layers and the protective layers, the thickness is only 5 microns (0.005mm). So it is very important to take care not to allow scratches not only the side of the plastic substrate (on the CD-RW the side covered by green is called the recording side), but also on the side with the protective layer (because this side usually has a label it is called the label side).

Because the CD-RW is capable of multiple recording and erasure, it is necessary to exercise care in the handling of the disc.

Based on fundamental precautions relating to the structural details noted above, we would like to provide a few more detailed examples regarding precautions for handling.

Operation and Storage Environments
The disc should never be exposed to high temperature humidity nor to low temperature and low humidity. Avoid exposure and to direct sunlight.
Precautions before Recording
Avoid smudging the recording side (substrate side)
Avoid touching or getting dust or fingerprints on the recording side of the CD-RW as much as possible. Should the disc get smudged by accident, it should be cleaned prior to recording, preferably using a camera cleaning blower, so as to avoid scratching the surface and spreading the smudges on the substrate side.

Use a CD cleaning kit when cleaning is necessary. Carefully read the manual, before you start cleaning. Wipe the surface radially, in the direction from the center of the disc to the outer rim. Never wipe concentrically, along the mark tracks, since such wiping may drastically damage the function to record the digital signals in sequence due to the concentric scratching. Avoid using the cleaner liquid for record discs (conventional mechanical ones) or other cleaning agents. Use only CD cleaning liquids.
Take care not to spatter your saliva onto the CD-RW disc when "breathing on them", when a camera cleaning blower is not available.

Avoid Bending and Dew Condensation
When the site temperature and humidity change abruptly, the equilibrium between the atmospheric humidity and the humidity inside plastic substrates of CD-RW (and of CD as well) is broken, sometimes causing a slight bending of the discs and a little dew condensation on the surface. If this occurs, leave the discs near the CD-R/RW drive for a while before using them so that they can reach equilibrium in the new environment.
Avoid Scratching on the Label Side
Like the CD and CD-ROM, the CD-RW's recording layer is located about 0.005mm from the label surface, which makes the recording layer vulnerable to scratches on the label side. Any scratches on the protective layer(:label side surface) may cause detachment of the protective and reflective layers, resulting in malfunction, this is because the recording layer is sandwiched between the reflective layer and the substrate. When writing letters on the label side, an oil-based felt-tipped pen should be used. Do not use a ball-point pen or other writing instruments with a hard tip. For safety, instant letterings or titles, already written, should not be erased.
Do not Attach Seals to the Label Side
Do not attach seals to the disc, which may cause, not only eccentric rotation, or crooked rotation in a disc changer unit, but may also have a harmful influence on the recording layer.
Do not Detach Already Existing Seals or Labels
Do not detach existing seals. Such an action could adversely affect the protective and/or reflective layers, since they may suffer detachment in the worst case, resulting in loss of the data.