Media Safes: Fire Protection for Drives, Discs and Data

A media safe is the answer to a narrow question: what happens to a hard drive, a box of discs or a stack of photo negatives in a fire, when the papers next to them would have been fine? The short version: UL 72 sets a lower interior temperature limit for media than for paper, so media needs a stricter fire class. This page explains the classes, what to check on a data safe, and how to read the table. For fire safes of every class, see our parent page on fire-rated safes.

A media safe is a fire safe with a stricter interior limit

Fire ratings under UL 72 have two parts, according to UL: a class, which is the maximum interior temperature reached during testing, and a time rating, which is how long the product withstood the fire. The class is the part that separates a media safe from a document safe.

The scope of UL 72, current 17th edition (January 2026), says what each class is meant to protect:

• Class 350 (350°F): paper records
• Class 150 (150°F): paper and non-paper records
• Class 125 (125°F): the strictest class, intended to also protect flexible computer disks

The standard also applies humidity limits to Classes 125 and 150, not just a temperature limit. So a media rating covers moisture inside the box as well as heat.

A data safe, in listing language, is usually the same product: a fire safe or box with a Class 125 or comparable media rating. The table on this page uses the strictest definition, UL Class 125.

Who a data safe suits, and who can skip it

A media safe makes sense if:

• You keep the only physical copy of something on a drive or disc. Family photos, business records, archives.
• You store photo negatives, slides or tapes. Non-paper records are what the lower classes are written for.
• You want fire protection for media and papers in one container. A Class 125 rating covers paper too.

You can skip it, or spend less, if:

• Your data is backed up somewhere else. A cloud or off-site copy covers the case where the safe fails, and the case where it never burns at all.
• You only store paper. A Class 350 rating is the class written for paper records; see fire-rated document boxes.
• You need water protection more than fire. Look for a stated water rating; see waterproof safes.

Home fires are common enough to plan for. The NFPA estimates US fire departments responded to 329,500 home structure fires in 2024.

What to look for in a media safe: class, time, tester

The class, by name. A media safe should name its class. "Class 125" is a specific promise from a specific standard. "Protects digital media" is a description. The scope of UL 72 still refers to flexible computer disks, which tells you the standard has been around a while. It doesn't mention USB drives or SSDs by name, so treat any listing that says it does as the manufacturer's wording, not UL's.

The time rating. How long the interior stayed within the class limit. UL time ratings are commonly listed as, for example, ½, 1 or 2 hours. A Class 125 rating with a short time and a Class 350 rating with a long time are not comparable: one is stricter, the other is longer.

Who tested it. UL, Intertek (ETL) or the manufacturer. Intertek, which issues ETL marks, is an OSHA-recognized testing laboratory. Some media claims are ETL verifications rather than UL classes. Intertek's verification for one line of SentrySafe chests and files, for example, uses a modified UL 72 with the fire endurance test only, and verifies that digital media such as DVDs, CDs, memory sticks and USB drives were retrievable after the test. That's a real, independent test of media. It's also a different test from a UL Class 125 rating, so name both halves when you compare.

An impact rating. UL tests impact-rated products with a 30-foot drop while hot, then returns them to the furnace. If the safe will stand on an upper floor, look for "impact" on the label.

Interior size and layout. Insulation takes up room, so the interior is smaller than the outside suggests. Check the interior dimensions against your drives, cases or binders.

The lock and the anchoring. A media safe holds valuable data in a small, light box. Check the lock type, the backup, and whether the safe can be bolted down.

A media box inside a larger safe is a common setup

Not everyone needs a whole safe rated for media. Often only a small part of a household's storage needs the stricter class: a few drives, a disc binder, the negatives, an old camera's memory cards. The rest is paper, which is what a Class 350 rating was written for, plus valuables. One option is a small Class 125 container for the media, kept inside or next to a larger safe for papers and valuables.

That arrangement has a logic to it. The larger safe handles bulk, weight and anchoring. The small media container handles the stricter temperature limit. Check two things before you rely on it:

• That the small container has its own rating. A media box without a stated class or a named tester is not adding a known level of protection.
• That it fits. Measure the interior of the larger safe, and the exterior of the media container, before ordering either.

Whatever the setup, keep an up-to-date list of what's stored where, outside the safe. And refresh the drives themselves from time to time: a fire rating says nothing about how long a drive or disc lasts on a shelf.

How to read the table and compare media safes

The table lists fire safes and document boxes with a UL 72 Class 125 rating. Products confirmed with a different class are left out. Where the class isn't confirmed, the cell shows a dash and the product stays in, so you can check the listing yourself.

• UL fire class first. Confirm Class 125 on the listing or the UL label.
• Then the fire columns. Minutes, test temperature and who tested it. Longer is better within the same class from the same tester.
• Then interior volume. Make sure what you're storing fits, with room for the next drive.
• Then lock, weight and water. These decide how well the safe handles everything that isn't fire.

There's no best media safe in the abstract, only the one whose class, time and interior match what you store. If none in the table fits, a Class 150 rating is the next step for non-paper records; our page on UL-rated safes lists safes by rating. Our guide to UL safe ratings explains every class in detail.

Brands that make media safes

The brands below have Class 125 safes or boxes in this table. Each brand page lists its models with the fire class, time rating and who issued it.

List what you need to protect, then check the interior of each safe in the table against it. Confirm the class on the label, write down who tested it, and keep a second copy of the data somewhere else. Then check the price.