Helium-sealed drives are not ordinary drives with a different label. The enclosure is hermetically sealed at the factory because helium is about one seventh the density of air, and the entire mechanical design depends on it. The heads fly closer. The platters are thinner, so more of them fit. Turbulence that would be unacceptable in air is manageable in helium. Remove the helium and you have not opened a hard drive. You have changed the physics the drive was engineered around.

The moment the seal is broken, helium leaves and air replaces it. Fly height, damping and turbulence all shift at once, on a stack that may carry a dozen or more heads. The drive may still spin and may still read, and that is the trap, because it will not do so reliably or for long. A helium drive opened and run in air is a single attempt, not a process. Whatever imaging you are going to get, you get once.

There are two ways to work with that, and they are the only two. The drive is refilled with helium after the work is done, purging the air out through the release port as the helium goes in and resealing the enclosure. Or the drive is opened and operated inside a sealed enclosure flooded with helium, so the atmosphere is never lost in the first place. Neither is a small piece of equipment and neither is something a repair counter owns. We have performed research and development on different approaches here, because there is no supplier you can buy this from the way you buy a laminar flow hood.

The factory hermetic seal, lifted. This foil is the only thing holding the helium in, and the port beneath it is where a refill has to go back in. Disturb this and the drive is no longer the machine its engineers designed.

A 12TB helium-sealed drive, sixteen heads, opened in our clean room during development work. The moment the seal is broken the helium is gone and every head on that stack is flying in air.

Refilling the enclosure through the release port, purging the air back out as the helium goes in through a bleeder hole. This is development work in our own laboratory, not a photograph of equipment anyone sells.

A point that gets missed: a helium enclosure and a clean room are not alternatives. The enclosure controls the atmosphere. The clean room controls the particles. Opening a helium drive inside a sealed helium box that nobody has ever particle-tested means you have solved the gas and left the platters exposed to whatever is in that box. Both problems are real, and only one of them has a number you can ask for.

Then there is the part no enclosure solves. Modern drives carry adaptive data unique to that specific drive in firmware, and getting to it means unlocking the service area. Without service area access there is very little to be done, whatever the gas is. Support for that is model by model and family by family. Helium drives are not one thing: different manufacturers, different generations, different architectures, and firmware access that exists for some and does not exist for others. A drive that is fully supported and a drive that is not can sit on the same shelf at the same capacity.

Which is why “we do helium recovery” is not an answer to anything. The honest answer names your drive. If you have a helium-sealed drive and a laboratory has quoted you, ask three things. Is this specific model and firmware family supported for service area access, or is that being assumed? What is the drive opened inside, and what is the measured class of that air, certified by which firm and on what date? And is the helium replaced before imaging, or is the drive being run in air as a one-time extraction?

A laboratory that has actually done this work will answer all three in a couple of sentences, because these are the questions it asks itself before it accepts the case. If you have a helium drive that needs data recovery contact us with the exact model and description of the problem, and we’ll let you know if this is a case we can accept before charging you anything or taking up your time.