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Western Digital Announces World's First 10TB Helium-Filled Hard Drive (techgage.com)
Deathspawner writes: Western Digital today announced a new, helium-filled enterprise HDD that allows for 10TB capacities without using the SMR method, sticking to industry standard PMR. SMR, or Shingled Magnetic Recording drives, can not typically be used natively by the OS or disk controllers, and instead often require extra software and/or firmware updates. This makes their broad adoption limited, since the drives are not drop-in replacements for the far more ubiquitous Perpendicular Magnetic Recording (PMR). WD's latest enterprise drive, sold as the HGST Ultrastar He10, uses the PMR storage method, and as such is a full drop-in replacement for any standard hard drive.
Stop promoting this myth.
From http://geology.com/articles/helium/
Some natural gas fields have enough helium mingled with the gas that it can be extracted at an economical cost. A few fields in the United States contain over 7% helium by volume. Companies that drill for natural gas in these areas produce the natural gas, process it and remove the helium as a byproduct
And by 'byproduct' they mean blow it to the wind without a second thought. That's 7% helium by volume, just dumped as we type. Do you think the world's party balloons (or fractional amounts in hds) even come close to this volume?
Purifying helium is not hard: everything else condenses out way before it does. You just blow "dirty" helium over a sufficiently cold heat exchanger, and everything other than helium will condense on the heat exchanger. See e.g. this excellent reference.
A successful API design takes a mixture of software design and pedagogy.
The MTTF makes a big difference to large installations. (I don't know what MTFB is besides a typo in the article -- Mean Time to Fail Badly, perhaps? In any case, MTTF is the better measure of hard drives as they're pretty much not worth repairing, as MTBF would measure.)
We have one installation that operates 60,000 hard drives that spin a total of 24*60000 = 1,440,000 hours per day. A MTTF of 2.5 million hours means I can expect one of these drives to fail every other day. While that would be much better than our current rate of 12 failures per day, and would save us a lot of money on maintenance contracts, it doesn't mean the drives are impervious to failure. It just means that their failures are less expensive than our current drives.
I also have a hard time believing any disk manufacturer's claims for longevity, because we often prove them wrong. We bought a handful of "enterprise class" drives for a dozen workstations that claimed a 1.2 million hour MTTF. We had 8 out of 24 drives fail within 50,000 hours (5 years), for an actual MTTF of less than 150,000 hours (the failures happened after burn-in but before the 5 year mark, which is when the machines were replaced.) Claims of 2.5 million hours MTTF just don't ring true.
John
Wrong. Diffusion depends on the PARTIAL pressure difference of the helium. For helium at one atmosphere on one side, and the atmosphere itself on the other side, the partial pressure difference is one full atmosphere.
Then you are not worried about helium leaking. You're worried about oxygen and nitrogen leaking in. Thankfully those are all WAY easier to stop then helium, and a properly designed device shouldn't have trouble.