HDD fails at pressure increase: MHY2080BH vs MHZ2080BH

One of our clients have experienced issues with Fujitsu hard disk drives of type MHZ2080BH. If the surrounding pressure increases, the hard disk drive fails.

We have supplied a number of Fujitsu MHY2080BH (2.5" SATA 5400RPM 24/7 ESW.) Does anyone have any knowledge or experience with these? What are their differences or similarities? Are they more or less likely to fail than the other type?

Computers are placed in pressurized cabinets as the equipment is placed in an Ex zone. The pressure is not particularly high, but must be higher than outside the cabinet. Hard disk drives tend to fail during the purging phase.
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All hard drives are typically sealed with the exception of a ventilation hole to equalize pressure. You may want to check some stats on the size hole those drives have. Also, may I ask why you are doing this?
nebb-alxAuthor Commented:
We have had pressurized  cabinets for a decade and this has not ben a problem before. A competitor have replaced 500 Fujitsu MHZ's with this pressure problem with Hitachi disks and that solved the problem for them.
We are discussing whether to replace all our delivered systems with hard disk drives that have not previously failed. We have no reports of failure for this reason, but our client wants to be assured as we are using HDD's of the same make.
Just as a note to those that think there is manual pressure on the disks. We are here talking atmospheric pressure. (dmanisit, you got it right.)
These are some of the problems reported with these drives by data recovery labs: http://www.datacent.com/datarecovery/hdd/fujitsu/MHY2080BH ... None of the reports mention any issues related to pressure increase.
Notice that they mention: "...They are quite rare guests in our lab, thanks again to Fujitsu next to ideal mechanics and firmware implementation...". This should help provide your customers with the assurance of quality they are seeking.
If the high pressure is related/compared to altitude changes in atmospheric pressure, these are the ranges between which these drives should function flawlessly as per Fujitsu:
Altitude Operating -300 to 3,000 m (-1,000 to 10,000 ft.)
Non-operating -300 to 12,000m (-1,000 to 40,000 ft.)
Considering that 14.7 PSI is the average atmospheric pressure only at sea level and that by definition is the force per unit area exerted against a surface by the weight of air above that surface in the Earth's atmosphere, this pressure increases as your altitude decreases and a -300 meters operating range would indicate that this drive model is more than suitable for withstanding high atmospheric pressure.
I hope this helps.
Bits ...

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nebb-alxAuthor Commented:
Haven't really come to a great conclusion here. Will post if I figure out something valuable. Thanks for your help.
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