i have couple of these hdds for repair. they are tested and working very well, how can i solve this problem with gas sensor?

smart status

pump more gas in

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A backup a day keeps DR away.

you are very very so so funny

I have several helium server disks and so far none have run low but its not rocket science to pump more into such a disk. More realistically it is advisable to get a new disk which will likely be stable for a while versus clinging to an old dying disk.

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Orico DS500C3-US-BK 5-disk 3.5" SATA, iTGZ 4x M.2 2280 Thunderbolt enclosure NVMe/SATA, etc. etc.

After working with dozens of EXOS hard drives, it has been proven to me that some of them report this error unrealistically. This is a factory bug, and there is a problem in the sensor system and its related circuitry.

I’ve seen similar issues with some Seagate drives, seems like the gas sensor error is a known bug on certain models. It might be worth checking with Seagate support or trying a firmware update if you haven’t already

How would you do this and maintain the seal?

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A backup a day keeps DR away.

ISTR that HDDSurgery is able to recover Seagate helium models in an air environment. If so, then the fact that a Seagate helium model continues working with a SMART sensor failure would be inconclusive evidence of a bug. I would compare the temperatures of a good and "bad" Seagate helium model under the same workload. The good drive should run significantly cooler.

_________________
A backup a day keeps DR away.

Try Crystal Disk Info which does show helium levels in server class disks.

_________________
Orico DS500C3-US-BK 5-disk 3.5" SATA, iTGZ 4x M.2 2280 Thunderbolt enclosure NVMe/SATA, etc. etc.

Try Crystal Disk Info which does show helium levels in server class disks.

Helium allows for 8 or even 9 plates in the media spindle. Helium has far less friction vs air.

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Orico DS500C3-US-BK 5-disk 3.5" SATA, iTGZ 4x M.2 2280 Thunderbolt enclosure NVMe/SATA, etc. etc.