IBM ThinkPad X20, Supplementary Manual

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Avoid using a telephone (other than a cordless type) during an electrical
storm. There may be a remote risk of electric shock from lightning.
Do not use the telephone to report a gas leak in the vicinity of the leak.
Laser compliance statement
An optical storage drive (device), such as a CD-ROM, CD-RW, DVD-ROM
drive and SuperDisk, which can be installed in the IBM ThinkPad computer is
a laser product. The drive’s classification label (shown below) is on the surface
of the drive.
CLASS 1 LASER PRODUCT
LASER KLASSE 1
LUOKAN 1 LASERLAITE
APPAREIL A LASER DE CLASSE 1
KLASS 1 LASER APPARAT
The drive is certified by the manufacturer to comply with the requirements of
the Department of Health and Human Services 21 Code of Federal
Regulations (DHHS 21 CFR) Subchapter J for Class I laser products at the date
of manufacture.
In other countries, the drive is certified to conform to the requirements of
IEC825 and EN60825 for Class 1 laser products.
DANGER
Do not open the optical storage drive unit; no user adjustments or serviceable parts
are inside.
Use of controls, adjustments, or the performance of procedures other than those
specified might result in hazardous radiation exposure.
Class 1 laser products are not considered hazardous. The design of the laser
system and the optical storage drive ensures that there is no exposure to laser
radiation above a Class 1 level during normal operation, user maintenance, or
servicing.
Some drives contain an embedded Class 3A laser diode. Note this warning:
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ThinkPad
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X Series Service and Troubleshooting Guide