Class 125 rated devices are meant to also protect flexible computer disks. Class 150 rated devices are designed to protect paper and nonpaper records such as EDP media (magnetic tapes) and photographic records. If you are storing such media, you will need a safe that has a low rating, meaning that the temperature inside the safe will not get too high. Media such as diskettes, CDs and tapes are unable to survive high temperatures. A 2 hour rated safe will last at least 2 hours in a fire. During that time, the temperature inside the file cabinet will not exceed 125 degrees Fahrenheit. For example, a safe with a 1 hour UL 125 rating will last at least one hour in a fire. UL ratings are done by temperature and time.
Keep in mind that if it doesn't have an Underwriters Laboratories seal, it is not an insurance approved media safe for the U.S. The UL rating is done by Underwriters Laboratories, a not-for-profit independent testing organization. The first thing to look at is the UL rating for the safe.
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