2477 posts • joined 10 Jun 2009
Re: SSD are not reliable enough yet!
SSDs are certainly more rugged. For laptops that get banged about, they might be the better choice. SSDs aren't more reliable on the desktop. They don't give advanced warning of failure. One moment they're AOK, the next monent they're done for. They wear out and die - the more that is written to them, the faster they wear.
Nevertheless my employer is going over to SSD for the system drive of all future desktops. The speed-up (especially in boot and log-in times) is extremely significant. They also save quite a few Watts per PC (and again on the air-con). No irreplaceable data lives on the SSDs. Everything that matters is on "enterprise" big RAID-6 arrays of spinning rust in the server room (and incrementally backed up to another site every night). If the desktop's SSD fails, just throw it away, connect a new one, reinstall the image across the network, and carry on as if nothing happened.
Re: Not in my experience
Really? Did you run software to check the SMART statistics that turned into bricks? Did you try ddrescue after the failure? You must be a very unlucky chap. Based on a sample size of several hundred over a decade, the majority of hard drives (probably 2/3) do show signs of going bad before they fail completely (at which point I pre-emptively replace them), and ddrescue can retrieve a large part of the data from maybe half of the other third.
Anyway, we have backups, don't we?
Why no two-part phones yet?
Seems to me that what's needed is a two-part system. A largish tablet, for internet access. A small and very light weight "phone" for one's shirt pocket. Link the two parts by bluetooth.
Even better if they standardise the interconnection protocols, so any tablet can support any bluetooth phone. (I'm dreaming).
Re: Very Large Phones
I was thinking megaphone ... except that's already taken. Sigh.
Re: VLP == Vain Losers Poserphone
I doubt that being seen with it is a consideration these days. I'd expect that the typical user of this device wants to use the internet a lot more than he wants to make phone calls. Or is visually impaired, and finds any smaller screen verges on un-usable.
Re: Sex or Murder?
Or a labourer having fun? (Strap the phone to the handles of a pneumatic drill ...)
Re: Real risks are long term
So you don't let it get loose on the surface. It needs to be treated like it would be if it was effluent coming out of a factory. The oil and gas industry has plenty of experience of dealing with high-pressure conventional gas and oil wells that need no encouragement to flow, and they very rarely leak near the surface. A fracked tight gas well is a much more benign entity.
How to dispose of this mildly toxic water (which is probably safe enough to swim in, but not to drink)? I don't know what the regulations say. Personally I'd guess that the thousand-fold dilution you'd get even in the immediate vicinity of dumping it into the sea would render it quite harmless.
"Radioactive isotopes?" Are you implying that fracking is a new method of isoptope separation that doesn't require ultracentrifuge chains, etc? Or are you just referring to the Radon being produced with the fracked gas, just as it's produced with conventional gas? Yes, the gas that feeds your heating is measurably more radioactive than the air you breathe. (Unless you live in Aberdeen, in which case natural radioactivity in the local rock that the city is built from likely guarantees it's the other way around!)
You get bigger earthquakes when a car drives over a speed hump near your residence. A fire engine at full emergency tilt over that hump is Richter 4-plus (Wikipedia: Noticeable shaking of indoor objects and rattling noises. Felt by most people in the affected area. Slightly felt outside. Generally causes none to minimal damage. Moderate to significant damage very unlikely. Some objects may fall off shelves or be knocked over.)
They monitor for tiny quakes because of the theoretical risk that fracking might lubricate and activate an occult fault (one that's present underground but not visible on the surface). AFAIK to date, there has been no significant seismic event capable of threatening life caused by fracking. Pre-drill seismic prospecting will show up most faults before the drilling goes anywhere near them.
Re: Gross stupidity
If corners are cut to the point of failure, what's the worst case? Considerably less bad than it could be with a conventional free-flowing gas or oil well. Pre-frack, nothing comes out. No chance of a blow-out while drilling, which is the greatest risk with conventional gas or oil. Post-frack, a natural gas leak. Tight gas flow rates are quite low compared to conventional wells, which is why lots of them are needed.
Ignoring global warming, is there any energy supply technology that's less likely to cause environmental damage than tight gas accessed by fracking? As for global warming, yes, it's a fossil fuel, but natural gas is the least bad one.
I'd happily have a tight gas well in my back yard. (If literally that close, it would be like living with a building site while it was drilled: I'd expect appropriate compensation for a noise nuisance). BTW with respect to Richter-3 earthquakes, I'm getting one every few minutes in my flat ever since the council installed speed humps on the road outside!
Pity nothing asked about ReRAM (Memristors). When do they see it becoming a competitor with Flash? Are they planning to manufacture it? Etc.
Leakage from a laser tube may be accelerated by the fact that the thing runs hot and the gas is ionised. Is it He2+ that gets into the glass? (He2+ a.k.a. alpha particles, helium nuclei). On the other hand, I'd expect glass to be an intrinsically better gas-container than a multi-part metal HDA.
Re: Sounds a bit too complicated for me
The problem with head size is that they can't make it smaller while still passing enough current through a coil that small to generate an adequate magnetic field. Too much power in a very small volume = meltdown (and they still haven't found a room-temperature superconductor).
Which is where HAMR comes is. Shine a laser through the magnetic field created by the head, focussed on one track of the several under the head's "bubble" of magnetic field. That heats up the surface of the platter. Choose the magnetic medium right, and the head's magnetic field will flip only the bits in the heated track while leaving the cold tracks on either side unaffected.
To me HAMR feels like good physics and engineering, SMR feels like a kluge. Bits that can only change state when heated should be MORE stable than those stored conventionally.
Some SMR maths. A conventional disk doing small writes may manage 100-up IOPS (seek time ~8ms which dominates, half a rotation of latency 4ms, a bit of optimisation possible by doing out-of-order writes). If they shingle three tracks, the rotational latency of a write goes up to about six revolutions of the disk (three to read it and three to rewrite it after modification). That's about 50ms for a 7200rpm disk. SLOW except for large writes. (Reading will be no slower).
Magnetic media aren't worn out by repeatedly being written. (They can be adversely influenced by the read-write head lying at one particular location most of the time, whether active or not. The mechanism here is interaction between airflow and tiny amounts of contaminants within the sealed HDA. For this reason drive firmware periodically performs a random "elsewhere" seek on an idle disk)
The amount of power used in writing a track is a very tiny fraction of that used to keep the whole mechanical assembly spinning and to move the heads around.
So I wouldn't expect this aspect of SMR to reduce drive life expectancy.
However, there's a major qualitative change with SMR. In a conventional magnetic drive, once your track is written, it stays there on the disk without any maintenance being needed. With SMR, it will be read and rewritten whenever nearby data is updated. If something isn't working right, there is much greater potential for your pre-written data to become scrambled. In this respect, I'd expect SMR drives to "brick" themselves far more easily. More like an SSD (which also performs read-modify-rewrite cycles), less like the magnetic disks we're used to.
I hope that "old technology" drives remain on sale for a considerable overlap period!
Re: Ah, America...
Surely the authorities have their hands full with things more dangerous than pressure cookers. My list would have guns at the top, Ammonium Nitrate fertilizer second, and barbecue charcoal well above pressure cookers.
Re: Whats the problem.
I guess they're lucky their son wasn't academically inclined and worried about future energy security. He might have wanted to find out the relative merits of conventional nuclear reactors (which create chemically separable Pu239 which can be made into A-bombs) and the mooted Thorium reactors (which breed chemically separable U233), and whether one can make an A-bomb from U233.
I never did find a definitive answer to that last one. I wonder what lists I volunteered myself onto?
Re: You don't need a pressure cooker to cook quinoa
You can cook rice in five minutes in a pressure cooker. Not sure who needs to save ten minutes of meal preparation, or why, but I guess it also works with quinoa!
Maybe easier in Europe for this one? Here in the EU one has an expectation of privacy in a lot of contexts. You employer should not be reading your e-mails without good reason.
In the USA, as far as I can tell you have no expectation of privacy unless you are talking to your priest, your doctor, or your lawyer.
Re: People are like golden retrievers!
911. He's in the USA. Some parts of the USA, he's not joking.
Re: So don't shop while at work?
There are employers out there who regard using the company internet for private purposes as grounds for dismissal. I hope that they get the sort of employees they richly deserve (ones so incompetent that they can't get a job anywhere more enlightened, and "seagull" mercenaries in it just for the money).
Re: Thank god for the war on Terror
Without knowing the content of the bosses call it's tough to say.
Me, I'm starting to wonder if the Laundry is just fiction?
I'm also wondering, if it's tethered, why not an electrically powered aeroplane for calm conditions, turning into a tethered glider whenever there's enough wind? (Electric power from the ground, via the tether).
What is the advantage of the "extra lift" from a kite design? Surely on a calm day, it either displaces enough air to keep its payload and the cable aloft, or it doesn't and sinks to the ground! Alternatively if it's trustably windy, why bother with the helium?
It's long been deduced that magma from very deep in the earth must occasionally come to the surface very quickly. Diamond is a stable form of Carbon only at very high pressure (>50km deep, ISTR). If magma containing diamond rises slowly, the heat and reducing pressure will decompose the diamond into graphite. It has to rise fast and cool fast, to freeze the Carbon as metastable diamond.
Diamond is associated with the igneous rock Kimberlite, and no Kimberlite erruption has taken place in recent geological history. This is possibly a good thing. They may be extremely violent events and/or happen unexpectedly at a location with no extant volcano.
Unless a Latin American country grants him assylum, I doubt we'll hear anything more from him. Russia has made it clear that they expect him to keep his mouth shut, and at present he doesn't have any other offers of a safe home. Sad. It appears that there is no longer anywhere even slightly civilised that allows one to say things that the USA government doesn't want you to say.
If Russia allows him freedom to travel and an exit visa, it is now at least possible for him to reach Latin America without passing through US allies' territory. (Travelling Eastwards through Russia and then across the Pacific).
Windows NT 3.1 was the biggest remake of the Windows family until Windows 8 came along
True, if you are looking "under the hood" i.e. at the kernel. (But note, the Win 8 kernel is still derived from NT). However, the kernel is not the first place most Windows users look. The other revolution was replacement of the Windows 3.1 GUI by the Windows 95 / 98 / 2000 / XP GUI, which pretty much defined a (small-w) windows desktop until Windows 8 was dumped on us.
NT 3.5 (at the time it shipped) was unbelievably stable, but still ran the 3.1 desktop. (It was basically NT 3.1 with most of the bugs fixed). NT 4.0 ran the newer desktop, which had required driving a coach and horses through the carefully designed VMS-like security model of NT 3.x. The system's architect, David Cutler, formerly architect of VMS at Digital, left Microsoft around the NT 4.0 release, possibly because of Microsoft putting image above security considerations. Microsoft has probably been paying the price ever since!
Re: Extortion - time for the oft to get involved in the UK?
Ten dollars, or even fifteen, per smartphone, is hardly serious distortion of a market where customers pay twice that per month.
The far greater Microsoft monopoly abuse scandal is the way they have made it all but impossible, for very many years, to buy a PC and reclaim the full cost of the Microsoft Windows license which isn't wanted by people who run Linux. Yes, it' s possible to buy a PC without Windows in a few places, but it's hardly ever any cheaper, let alone as much cheaper as the known cost of a Windows OEM license! £50 per £400 PC is a far greater "tax" than $15 on a phone, and has far less justification.
Memristor rewrite-ability is effective infinity. It's targetted at replacing RAM, i.e. word addressable, with the added benefit of being non-volatile.
Price per Gbyte will start high and fall as the technology and semiconductor processes are prefected. It'll probably replace Flash within a decade unless there's some problem that hasn't yet surfaced in the labs. The more interesting thing is whether it'll ever be able to replace big disks. (i.e. multi-terabyte for under £100)
Re: Guilty by accusation
And you have eleven who think he deserves a fair trial. Or six. Or three. If as few as three won't convict, he's re-tried or acquitted.
One person who argues for an acquittal based on the evidence rather than prejudice is likely to be enough. Fiction, but a great classic movie: "Twelve Angry Men" has this plot.
Wouldn't the standard of critical thought on evidence here terrify you?
No, because it would have to be 10/12 of the jury like that before it made any difference. This case proves that the system works. The "bad apple" on the jury has ended up in the dock.
This is why you are tried by twelve jurors, not one or three. You'd have to be extremely unlucky to have ten out of twelve such idiots on your jury. Fewer means, at worst, a mis-trial. More likely, one good (wo)man and true on your jury will denounce the idiot(s) to the judge as soon as (s)he becomes aware of them.
There's a case to be made for ensuring that a minority of a jury are technically competent (for example, accountants in fraud trials; scientists where forensic evidence is complex). Maybe 4/12 of them. Never a majority, let alone all. Selecting such a group is likely to select for correlated prejudice.
Re: Are ink jets that difficult?
Never buy a cheap ink-jet printer. With these it's true that they are made to sell expensive ink cartridges.
I have good experience of HP Officejets in the £80 - £120 bracket. I have several K550, K5400, 8000 models with 25,000 pages printed - some over 50,000 pages. Average print-out at time scrapped probably 35,000 pages.That's a per-page cost of 0.4p down to 0.2p, which is small compared to the ink cost, which in turn is lower than the running cost of any colour laser printer I know of. Plus colour quality is higher. Minus operating speed in duplex mode is slower, because of delay for ink to dry on one side of page before the other is printed. Latest HP8100 looks good though it'll be a couple of years before I can be sure.
Although not cheap ink-jets, they are cheap enough to treat as consumable when they do eventually fail. You can't say that of any colour laser printer that has comparable running costs.
No experience of other makes, so read nothing except their relative hostility to Linux into that omission.
And I've just finished recovering a server that crashed overnight when a WD RAID edition disk turned into a brick "just like that".
I don't hold this against WD. I do wonder whether Seagate are more honest in revealing SMART data that encourages one to replace a drive BEFORE it becomes a brick. Or maybe they are less reliable. Not enough data.
Unless one is Google with tens of thousands of drives to draw conclusions from, it's pure speculation. Also every drive one ever buys is in effect a prototype. By the time five years have passed and it's proven itself as reliable as you'd have wished, it's also long-obsolete, and I very much doubt whether the reliability performance of (say) WD1600AAJS drives tells you anything at all about the ones they are shipping today. I work on the assumption that every manufacturer is likely to ship bad batches from time to time, and to design "lemons" with poor endurance from time to time. Concentrate on the backups. It's data that's valuable, the disks are cheap in comparison.
Re: Whales knew they were there ...
I'll accept the literal meaning of translucent is light-specific. I thought extending it to how a whale's sensorium probably depicts a man was obvious. I was going to say "transparent" but that implies close to "invisible", which is completely wrong.
Whales knew they were there ...
Whales and other cetaceans see by sonar, so they surely knew that the divers were there.
In sonar, you are translucent. So the whales can see your internal organs working. If they're intelligent enough, they probably have you pegged as a funny sort of dolphin with a hard thing on your back. If they have a sense of fun, they can see exactly how much they've startled / scared you by how much your heart speeds up.
My guess, those whales knew *exactly* what they were doing!
London Zoo had asked for a very large grave to bury a walrus in. The gravediggers didn't know what a walrus was, except one who said it "you know, grey skin, long tusks". So they dug an elephant-sized grave. Lots of space left when they found out what a walrus was, so they gave a day's worth of paupers a free burial at London zoo's expense. Man with hole in head? He'd fallen off a fourth floor scaffolding onto the cast-iron railings below.
I can't see any justification for the police recording *any* ANPR data long-term, whether they are recording all routes out of an area, or just one. (Short-term capture, to check against a database so un-taxed or un-insured drivers can be stopped a mile up the road, is fine by me. Longer than a day, is not! )
Bear in mind that a criminal with something to hide, can clone the plates of another car of the same make, model and colour. For the same reason, recorded ANPR data can't be used as evidence. It proves what letters were on a plate, not what car the plate was attached to.
Re: I like how they state .....
Yes, they don't have a clue about the difference between correlation and causation. In the 1950s correlation famously "proved" (not!) that watching TV caused lung cancer. TV sets of that epoch gave out quite a lot of X-rays, percentage of households with a TV was rising fast, lung cancer was rising fast, so not a silly suggestion. But the real culprit was increasing affluence causing increasing cigarette consumption as well as increased TV sales.
With porn there is not even any correlation. The availability of porn has surely risen at least tenfold in the last decade. The incidence of ghastly assaults on children has not. Probably it has not increased at all, once one allows for increased reporting. The same is likely true of rape. So this appears to be evidence that perverts are NOT created by watching porn, and that the money which is about to be wasted by ISPs would be much better used to increase funding for child protection and victim support agencies.
Re: Lets do maths
Each meter costs £265. There are 53 million households according to the article which need to be fitted. so the total is £265 x 53,000,000 = £14 Billion.
How much electricity is this going to save?
Lots. You and I, the energy consumers, are going to be paying for the meters, through higher electricirty prices. Those who are having trouble paying their bills, will have to cut back on something, and that something may well include electricity usage. Also it gives them the ability to cut off anyone who is in arrears with their bills far more easily. Also it gives them the ability to inflict a power cut on most of us, without the opprobium that goes with inflicting one on those for whom a power cut might be life-threatening.
Probably not the answer you wanted? What, me, a cynic?
Impact? Isn't lower G and solid core sufficient?
Mars is less massive than Earth. Mars has a negligible magnetic field compared to Earth. If the latter has been true for a long time, isn't that sufficient to explain how the sun's solar wind stripped all the water from Mars? Note, water vapour is the lightest gas in the atmosphere. Methane (a likely major component of Earth's early atmosphere) is even lighter.
So do they really need to postulate a catastrophe? (Other than the freezing of whatever liquid/magnetic core Mars might once have had, which would have been a catastrophe for Mars life when taking the long view).
Out of interest is there a simple proof that you couldn't make an achiral protein-building system? Is there a level of complexity of carbon chemistry at which chirality is unavoidable and below which there's an insufficient range of possible structures?
Sort of, and yes. A chiral molecule is any molecule with four non-identical sub-groups bonded to one Carbon atom. (There are also lots of other sources of chirality, but that one will do to start with). So, almost any complex carbon-based molecule will have a non-identical mirror-imaged form.
The more interesting question is whether mirror-life is likely to have evolved elsewhere in the universe. Life based on much the same building blocks as ours, but all components the mirror image of ours. Classical chemistry provides no reason why not. Quantum physics reveals that the weak nuclear force is itself chiral, and that there's a tiny difference in stability between Earthlife amino acids and their mirror-world alternatives. It's only about one part in 10^24, but there's a tipping-point in that L bonds stably with L, D bonds stably with D, and mixxed amino-acid polymers are much less stable than pure-L or pure-D ones. Ours is the mort stable. Evolutionary coin-toss, or inevitability?.
All speculation until we find some other instances of life. May be a long wait.
Re: "How do I know China would use their major telecomms mfg as a trojan horse into systems"
Trouble is that even if you are using open-source software, the hardware is closed. For a one-household linux router, maybe there's not enough space in the hardware to hide a backdoor. But in a corporate backbone hub, there's plenty.
Re: What if you don't have fingerprints?
Canadian oilfield workers can lose their fingerprints permanently. It's caused by repeatedly getting frostbitten fingertips, in turn caused by removing gloves in winter to do something fiddly, and accidentally touching a metal surface onto which one's finger-tip will instantly freeze.
Criminals have been known to attempt the same using a freezer. I suspect a freezer isn't as cold as outdoors in a Canadian winter.
Re: Amputating fingers
did they have it stuffed and put it on a key fob?
Gruesome thought! Maybe some bad guys do just that. More likely they use the amputated digit to drive the car to the criminals garage, where the car is dismantled for spares.
Life is cheap in SA(*). People count themselves lucky if a carjacker leaves them alive, instead of shooting them dead for a more certain getaway.
Firearm-homicide rate UK 0.04 USA 3.6 SA 17.0
Re: Not that bad
Mercedes briefly marketed a car that you unlocked with your fingers (in SA). That was until carjackers started amputating the driver's finger when they robbed him of his car ....
I am never going to allow a part of my body to be a key to an object of value!
Re: Make those bits work harder?
Analog recording is very much working against that fundamental property of the media, not in harmony with it.
To the extent that analogue tape recorders are in fact very crude digital recorders. The record head is fed with an ultrasonic signal that generates a stream of 1 and 0 bits on the tape. The Analog signal modulates this signal so that the 1 bits become wider or narrower on the tape compared to the 0 bits. The read head averages out the magnetisation of a few "bits" worth of tape, to retrieve the audio. A filter in the subsequent amplifier removes what little remains of the ultrasonic carrier after averaging.
The very earliest magnetic tape recorders didn't use the ultrasonic carrier. The technique was discovered accidentally, whem a component failure caused a parasitic oscillation to develop in the recording amplifier, and the fidelity of the recording became spectacularly better as a result!
Re: Error correction isn't good enough nowadays.
So if you really don't ever want to lose data, you have to write and read the entire medium before you use it for real.
Amen to that.
Re: Error correction isn't good enough nowadays.
HDD systems typically fail from mechanical failures but the underlying data is maintained and you can usually get someone to haul the data off the platters for enough money.
If "spend enough money" is not an option, always give ddrescue a chance! In my experience many drives fail soft: they report so many errors to an operating system that they look dead, but a utility that tries and tries over and over again in an intelligent way (as ddrescue does) will eventually retrieve all the data, or all but a very small fraction of the data.
Of course, you need backup, for the times that the drive does turn into a brick, just like that.
Also always keep an eye on the drives' SMART counters. In my experience many failures are flagged a long time in advance by an exponentially increasing number of reallocated blocks. I pre-emptively replace such drives, long before the error count hits the SMART failure threshold. It's the rate of increase that's the give-away, not the absolute number. I have one drive with a few hundred reallocated blocks from the first time it was written to, but that number hasn't increased by as much as one since then.
Re: Error correction isn't good enough nowadays.
This is why you put extra checksums in things that really matter.
ZFS, for example, does end-to-end checksumming, so it'll spot when a disk drive has corrupted data, and recover using redundantly recorded data where that is available (always, for metadata). Because the ZFS checksums are done at the CPU, it'll also spot errors between the disk drives and the CPU ( a failing disk drive controller, a flaky memory controller).
If your filestore can't be relied upon to protect you, store SHA256 sums of the data in your files. You can't correct using an SHA256, but the chances of a data error getting past it is truly infinitessimal.
But why bother? Why should they care?
I guess there may be some ingnoramuses out there that think the best place to find information is by guessing domain names. (Good luck to them, they need all they can get.) The rest of us type the key words into Google etc. and in instants find (for example) http://heylady.net/2010/08/06/why-i-hate-amazon-and-will-never-ever-ever-buy-from-them-again/
Except for one thing, the internet could easily dispense with names and go back to numeric addresses. That one thing is the extra level of indirection, the advantages of which I don't need to explain to technical readers. Heck, if domain names were just a dressed-up integer incremented by seven for each new one, domain-mistype-squatting would become impossible as a pleasant side-effect. Tinyurl.com proves (by existing) that many people actually prefer to use short if meaningless names.
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