How is wanting hydrogen cars anti-environmental when they are far greener than these battery cars both to make and refuel?
Hydrogen powered cars are a pipe dream primarily due to the poor volumetric energy density. Per pound, it's about 3 times more energy dense, but even at dangerously high compression it takes up 6-times more room. You simply can't safely store enough energy in the vehicle to get a decent range. Think a leaky battery is bad, try popping a contain at 10,000 psi. I won't even get into the lack of an existing distribution infrastructure.
Hydrogen (compressed at 700 bar = 10,153 psi ) 123 megajoules/kg 5.6 megajoules/liter
Don't forget that the bulk of Hydrogen today is produced by cracking natural gas and throwing away 30% of the energy in the process. Nuclear power might help, but then you're going nuclear->electricity->hydrogen. Might as well just use the electricity to begin with.
And yes coal is far and away the most dangerous. But that's a different danger, those dangers are from normal operation. You 'could' filter out the CO2 emissions and other pollutants
The irony is that burning coal has released far more radiation into the air than has been released by nuclear accidents
Fun trivial - If you extracted the trace uranium from 1 ton of coal, it can be used in a nuclear reactor to produce more power than burning the coal provides..
It was no more fire prone than any other car at the time. The Pinto also had lower Fatality rates than similar cars of the era.
Overall it was comparable to other sub-compacts. Looking at rear end impacts though, it had a much higher fatality rate due to a strong propensity of rupturing the gas tank.
Is this supposed to be a dedicated testing setup, or are these computers being used during the class and the students take the test at the end? Reason I ask is that the first scenario gives you time to boot to a CD or lock down the machines. The second scenario means your Java program must monitor for losing focus, or you have some other quick means of dropping internet access.
Personally, I vote for disconnecting the switch unless you need the local network to run the Java App.
Would disabling internet access be enough? You could have your app unload the Ethernet driver when it runs and then reload the driver when it exits. Of course your app would have to have system level permissions to futz with Ethernet and you'd have to deny those permissions to the user. I'm not sure how you could disable running other applications if you're not allowed to change the OS configuration.
You can give users permissions to enable/disable the nic. If the user or app has root, then stuffing appropriate limitations into iptables might do the trick as well.
How hard would it be for the Java app to record when it loses and regains focus? That would certainly tell you how long they spent outside of the test program.
It is saying that if you make more than $X then you are exempt from overtime, regardless of the nature of your job..
Assuming the nature of your job is IT as it describes. This change excludes this categories of employees from certain protections otherwise mandate by the FLSA (specifically http://law.onecle.com/uscode/29/206.html and http://law.onecle.com/uscode/29/207.html). It doesn't mean you automatically won't be allowed to work overtime, or that they can even force you to work overtime for free.
Voting should not be another phone app. It should take a deliberate effort on the voter instead of something you can do while sitting on the crapper.
It's absolutely scary how people vote now. They blindly vote along party lines and have no clue who the candidates are, their history or even their position on key issues (not the fluff crap the media tells you is important). You'd see a radical difference if the ballots just listed names and did away with the little (D) and (R) labels. Don't even put a description of their position or say who the incumbent is. If you want to vote for someone you better at least know something about them.
How long do you think it will be now before the blackhats start looking at the payment handling processes of 'a rising mobile payment start-up' with 'big-name financial backing' ? I don't think there are too many companies that match your description..
No need to search to hard for the company. Our illustrious OP, aka Mr. Christopher Reed (http://seeread.info/) was naive enough to post this on twitter (http://twitter.com/#!/seereadnow). "@TheLevelUp I think I found a trivial way to hack user accounts. Please get in touch to resolve."
At least he can point to the twitter feed as evidence that he was trying to contact them. This/. article where he considers "blowing them out of the water" would undoubtedly work against him though.
You should never have notified them and used your own moral judgement to answer your "ask slashdot" question. What a dumbass... No one should have ever known regardless of what you planned to do.
We all know that pointing out a security vulnerability will get you in big trouble. Hell, back in high school, we had Win 98 machines running Novell. I found a way to launch solitare, minesweeper, etc. by creating a macro in Word and editing the VB code to call an executable. Very simple to figure out, but I was the only one in my hick ass school (Home of the Mustangs in the southwest corner of MO) that would know such a thing. I lost my computer privileges for the rest of the year when I immediately brought it to the IT guys attention. I did it after class with no one else present. Thought I was doing the right thing.
Fuck you, Mr. Jay. And fuck the idiots at that school. Enough info in this post for the pertinent parties to know who they are.
You were looking for a pat on the back and to feel morally superior but it back fired, eh? Yup, sometimes the safest (I didn't say right) thing to do is to just shut up and back away.
BBB doesn't give a shit. My dad was approached several times to join the BBB, and it quickly became apparent to him that it's nothing more than a public relations gimmick. Anyone can join the BBB just by paying the membership fee, and the only way to really get dropped is to stop paying. Exxon and Goldman Sachs could be members, even criminal fraud convictions don't trigger automatic expulsion. They told him as much, and said essentially, "For the low annual membership fee you can claim membership in the BBB in your advertising." Since in 20+ years he never once took out an advertisement he told them to take a hike.
And as demonstrated by 20/20, the amount you contribute affects your BBB rating making it totally useless.
The test was actually much simpler than any real-world application might be. Each puzzle was really only one or two (or a few) shredded pages, with various degrees of shredding and various bits of writing.
Yes and no. The finest shred was actually pretty close to the current DOD spec of 1mm x 5mm for classified documents. You'll find that most sensitive but not classified shredders shred into much larger pieces, somewhere in the middle of the range given in the contest. You are correct that a typical shred bag has a large quantity of shredded pages mixed together.
Still DARPA got what they wanted - ideas on how to approach this problem. I doubt crowd sourcing is a viable option for them, but it was interesting to see the method.
I have a mix of users who want the latest Office 2010, and a more reasonable crowd who still want to stay with 2003. They don't see any benefit to the newer version and don't want to waste time learning a new GUI.
...
Speaking of outdated, you probably want Cygwin for the shell environment? That's outdated, learn powershell. (I have cygwin in my office for other valid reasons, like reading solaris tar tapes).
Fascinating! In one paragraph, you completely contradict another. Software developers are also your users. I'd suggest leaving the ego at home and provide what people need, instead of being a douche for no apparent reason.
Swoosh! You obvious missed the sarcasm in that last sentence. I was pointing out that contradiction in the previous poster who was saying XP was outdated yet wanted Cygwin to run bash scripts. Perhaps I need to put little smilies in there next time for the sarcasm impaired.:}
Yes I'm very much aware that software devs are users too. In fact, they make up 80% of my helpdesk calls despite only making up 10% of the user population.
* The ability to effectively address more than 4GB of ram actually impacts a lot of end users here in 2011 (Particularly engineers and scientists). * Sending client facing staff into the field with Windows XP is embarrassing. It is bad for business and can cause a lot of legitimate concern about how technology savvy your company is. * Office 2010 is a required upgrade for anyone you put on 2007 because 2007 remains completely unstable. * CYGWIN supports actual portable scripting and Powershell is an MS centric hack to try and keep sysadmin skills from being portable. There is no comparison. Powershell is good, but it is no Cygwin, not even close. * Windows 7 is more secure. Period. End of story.
If the business is not providing the funds to upgrade from XP, than IT management is a complete failure. They should be able to easily make an effective business case. Even people with a 5-year hardware upgrade cycle are rapidly leaving XP behind. (Only their oldest machines required a hardware upgrade to support 7). Anyone who is still deploying machines with XP today should be concerned about their jobs when senior management realizes how ineffective they are.
All great reasons for moving to Windows 7 64-bit, and I applaud you for citing technical reasons. Unfortunately way too many folks here are demanding Windows 7 because "Windows XP is outdated" which isn't a legitimate reason.
Instead of claiming IT management is a failure because they aren't blindly upgrading everyone, I reserve judgement and realize perhaps they are simply saving money by not upgrading the secretary to Win7 because XP runs her copy of Office 2003 just fine.
Looking at the replies to the grandparent comment reminds me of why I have despised IT folks before (even having been one), and why I'm so blessed in my current life.
When IT is trying to impose work patterns on devs, there's something seriously wrong. Either you've got horrible devs and/or dev managers, or your world view is extremely skewed. The same goes for IT dictating editors and tools. I can see discussions about allowed ports and such for in house applications, but if IT is preventing the development of software that a customer has put network requirements forth for, and IT is telling dev they can't do it, that's a serious problem.
Most of the IT requirements (at least for me in govt) are dictated well above the IT department. The IT guys at the working level have the displeasure of realizing that a lot of what they do, while necessary, is a hindrance to the end users in some fashion. Try not to bust their balls too much. Now as you go higher up the chain of command and you get non-technical manager types making technical decisions. Those are the guys that don't really understand the impacts at the working level, and often don't care because their raises depend on compliance and minimizing security problems (real or imagined) and not whether the R&D guys meet their goals.
Honestly, most of our software dev types are dangerous. A few barely understand what an IP address is and are heavy users of basic helpdesk support. A few some get upset why I tell them they can't use their personal laptop for handling proprietary work products. Do they need to? Not really. But they do need to recognize that the IT and network admin types have to look at the big picture and enforce things like firewalls for their protection.
You should have wireless networking in the first place. Your job is not to manage what websites users go to. If their boss wants them to play on facebook all day, it's none of your damn business as the IT dept. You should be keeping flash player updated in the first place. You should facilitate installing any required software for them to do their jobs as soon as it is bought and paid for instead of whining about supported software lists. You have an attitude problem.
- No wireless unless there is a legitimate need. - I do keep flash updated. It's the other user-installed plug-ins that I don't know about that worry me. - Let me know about the software ahead of time, so I tell you if it'll even run on your computer or is compatible with everything else. - I possibly do have an attitude problem. I can't help you get your job done if treat me as the enemy instead of a technical resource.
What exactly does Windows 7 provide you as the end user that Windows XP does not? My main reason for rolling out Windows 7 is that it has better centralized management and security features. Something I doubt an end user cares about. The non-tech types seem to care more about eye candy. Also consider that Windows 7 needs more horsepower and it not supported on older hardware, so if XP is working just fine, why replace the entire computer ahead of the normal lifecycle? Some systems that lots of memory, and for that I definitely go with Win7 (XP64 was a piece of crap).
I have a mix of users who want the latest Office 2010, and a more reasonable crowd who still want to stay with 2003. They don't see any benefit to the newer version and don't want to waste time learning a new GUI.
I don't care about minor software from trusted sources. Just don't start loading on crap or shareware that comes from untrusted sources (screen savers, your favorite widget, Flash, google desktop) and presenting a security risk by opening up vulnerabilities. If you have a legitimate need, you might try asking IT what other users are using. Then at least there aren't 20 different flavors of the same utility on the network.
Speaking of outdated, you probably want Cygwin for the shell environment? That's outdated, learn powershell. (I have cygwin in my office for other valid reasons, like reading solaris tar tapes).
Usually upper management insists on draconian restrictions upon the recommendation of IT who are trying to maintain their power and control. Scare the crap out of the pointy haired boss, you can do what you like as long as you say it is in the interests of security. Time to do away with in-house IT and move to utility. Put it up on the cloud and you don't have to deal with prima donna "tech support" or tech that goes out of date or security breaches etc.
Most people dislike IT, because they won't let them do what they want with the computer ("I like Mozilla better", "I prefer Office Office", "Why can't you fix the corporate apps to work on Linux version 346?"). Moving stuff into the cloud is an even bigger step towards standardized services, so how is that an improvement?
Wireless-N is probably not a necessity since it's bandwidth is probably much larger than your pipe to the outside world. There is some benefit to having the "last-mile" to the end user to be the bottleneck. so that one person can't gobble up all your cablemodem's bandwidth. Or you need to setup QOS or throttling to ensure a fair distribution of bandwidth. I guarantee at least a few of the RV'ers will try running NetFlix movies, at which point you're back to square one with people complaining that the interweb is slow.
Probably not your latter point, many of the bottled water cmpanies are soda companies.
I'm always amazed that the Soda bottlers managed to take their product, leave out the flavoring, sugar and carbonation and then sell it to consumers at a higher $/ounce price.
Seagate published a paper to justify why they went with 128-bit AES. The bottom line is that 256-bit encryption impacted disk throughput. That said, their Momentus 7200 FDE line is just as fast as their non-encrypting line.
Slashdot Mirror
How is wanting hydrogen cars anti-environmental when they are far greener than these battery cars both to make and refuel?
Hydrogen powered cars are a pipe dream primarily due to the poor volumetric energy density. Per pound, it's about 3 times more energy dense, but even at dangerously high compression it takes up 6-times more room. You simply can't safely store enough energy in the vehicle to get a decent range. Think a leaky battery is bad, try popping a contain at 10,000 psi. I won't even get into the lack of an existing distribution infrastructure.
Hydrogen (compressed at 700 bar = 10,153 psi )
123 megajoules/kg 5.6 megajoules/liter
Gasoline (petrol)
47.2 megajoules/kg 34 megajoules/liter
Don't forget that the bulk of Hydrogen today is produced by cracking natural gas and throwing away 30% of the energy in the process. Nuclear power might help, but then you're going nuclear->electricity->hydrogen. Might as well just use the electricity to begin with.
And yes coal is far and away the most dangerous. But that's a different danger, those dangers are from normal operation. You 'could' filter out the CO2 emissions and other pollutants
The irony is that burning coal has released far more radiation into the air than has been released by nuclear accidents
Fun trivial - If you extracted the trace uranium from 1 ton of coal, it can be used in a nuclear reactor to produce more power than burning the coal provides..
Ahh, funny you mention the Pinto.
It was no more fire prone than any other car at the time.
The Pinto also had lower Fatality rates than similar cars of the era.
Overall it was comparable to other sub-compacts. Looking at rear end impacts though, it had a much higher fatality rate due to a strong propensity of rupturing the gas tank.
Is this supposed to be a dedicated testing setup, or are these computers being used during the class and the students take the test at the end? Reason I ask is that the first scenario gives you time to boot to a CD or lock down the machines. The second scenario means your Java program must monitor for losing focus, or you have some other quick means of dropping internet access.
Personally, I vote for disconnecting the switch unless you need the local network to run the Java App.
Would disabling internet access be enough? You could have your app unload the Ethernet driver when it runs and then reload the driver when it exits. Of course your app would have to have system level permissions to futz with Ethernet and you'd have to deny those permissions to the user.
I'm not sure how you could disable running other applications if you're not allowed to change the OS configuration.
You can give users permissions to enable/disable the nic. If the user or app has root, then stuffing appropriate limitations into iptables might do the trick as well.
How hard would it be for the Java app to record when it loses and regains focus? That would certainly tell you how long they spent outside of the test program.
It is saying that if you make more than $X then you are exempt from overtime, regardless of the nature of your job..
Assuming the nature of your job is IT as it describes. This change excludes this categories of employees from certain protections otherwise mandate by the FLSA (specifically http://law.onecle.com/uscode/29/206.html and http://law.onecle.com/uscode/29/207.html). It doesn't mean you automatically won't be allowed to work overtime, or that they can even force you to work overtime for free.
Voting should not be another phone app. It should take a deliberate effort on the voter instead of something you can do while sitting on the crapper.
It's absolutely scary how people vote now. They blindly vote along party lines and have no clue who the candidates are, their history or even their position on key issues (not the fluff crap the media tells you is important). You'd see a radical difference if the ballots just listed names and did away with the little (D) and (R) labels. Don't even put a description of their position or say who the incumbent is. If you want to vote for someone you better at least know something about them.
This is just a spam article pushing the AQM software.
How long do you think it will be now before the blackhats start looking at the payment handling processes of 'a rising mobile payment start-up' with 'big-name financial backing' ?
I don't think there are too many companies that match your description..
No need to search to hard for the company. Our illustrious OP, aka Mr. Christopher Reed (http://seeread.info/) was naive enough to post this on twitter (http://twitter.com/#!/seereadnow).
"@TheLevelUp I think I found a trivial way to hack user accounts. Please get in touch to resolve."
At least he can point to the twitter feed as evidence that he was trying to contact them. This /. article where he considers "blowing them out of the water" would undoubtedly work against him though.
first off "how" did you contact them??
By email? --- probably went straight to spam or trash or ignored.
By post? see above.
By twitter?
http://twitter.com/#!/seereadnow
You should never have notified them and used your own moral judgement to answer your "ask slashdot" question. What a dumbass... No one should have ever known regardless of what you planned to do.
We all know that pointing out a security vulnerability will get you in big trouble. Hell, back in high school, we had Win 98 machines running Novell. I found a way to launch solitare, minesweeper, etc. by creating a macro in Word and editing the VB code to call an executable. Very simple to figure out, but I was the only one in my hick ass school (Home of the Mustangs in the southwest corner of MO) that would know such a thing. I lost my computer privileges for the rest of the year when I immediately brought it to the IT guys attention. I did it after class with no one else present. Thought I was doing the right thing.
Fuck you, Mr. Jay. And fuck the idiots at that school. Enough info in this post for the pertinent parties to know who they are.
You were looking for a pat on the back and to feel morally superior but it back fired, eh? Yup, sometimes the safest (I didn't say right) thing to do is to just shut up and back away.
BBB doesn't give a shit. My dad was approached several times to join the BBB, and it quickly became apparent to him that it's nothing more than a public relations gimmick. Anyone can join the BBB just by paying the membership fee, and the only way to really get dropped is to stop paying. Exxon and Goldman Sachs could be members, even criminal fraud convictions don't trigger automatic expulsion. They told him as much, and said essentially, "For the low annual membership fee you can claim membership in the BBB in your advertising." Since in 20+ years he never once took out an advertisement he told them to take a hike.
And as demonstrated by 20/20, the amount you contribute affects your BBB rating making it totally useless.
The test was actually much simpler than any real-world application might be. Each puzzle was really only one or two (or a few) shredded pages, with various degrees of shredding and various bits of writing.
Yes and no. The finest shred was actually pretty close to the current DOD spec of 1mm x 5mm for classified documents. You'll find that most sensitive but not classified shredders shred into much larger pieces, somewhere in the middle of the range given in the contest. You are correct that a typical shred bag has a large quantity of shredded pages mixed together.
Still DARPA got what they wanted - ideas on how to approach this problem. I doubt crowd sourcing is a viable option for them, but it was interesting to see the method.
I have a mix of users who want the latest Office 2010, and a more reasonable crowd who still want to stay with 2003. They don't see any benefit to the newer version and don't want to waste time learning a new GUI.
...
Speaking of outdated, you probably want Cygwin for the shell environment? That's outdated, learn powershell. (I have cygwin in my office for other valid reasons, like reading solaris tar tapes).
Fascinating! In one paragraph, you completely contradict another. Software developers are also your users. I'd suggest leaving the ego at home and provide what people need, instead of being a douche for no apparent reason.
Swoosh! You obvious missed the sarcasm in that last sentence. I was pointing out that contradiction in the previous poster who was saying XP was outdated yet wanted Cygwin to run bash scripts. Perhaps I need to put little smilies in there next time for the sarcasm impaired. :}
Yes I'm very much aware that software devs are users too. In fact, they make up 80% of my helpdesk calls despite only making up 10% of the user population.
* The ability to effectively address more than 4GB of ram actually impacts a lot of end users here in 2011 (Particularly engineers and scientists).
* Sending client facing staff into the field with Windows XP is embarrassing. It is bad for business and can cause a lot of legitimate concern about how technology savvy your company is.
* Office 2010 is a required upgrade for anyone you put on 2007 because 2007 remains completely unstable.
* CYGWIN supports actual portable scripting and Powershell is an MS centric hack to try and keep sysadmin skills from being portable. There is no comparison. Powershell is good, but it is no Cygwin, not even close.
* Windows 7 is more secure. Period. End of story.
If the business is not providing the funds to upgrade from XP, than IT management is a complete failure. They should be able to easily make an effective business case. Even people with a 5-year hardware upgrade cycle are rapidly leaving XP behind. (Only their oldest machines required a hardware upgrade to support 7). Anyone who is still deploying machines with XP today should be concerned about their jobs when senior management realizes how ineffective they are.
All great reasons for moving to Windows 7 64-bit, and I applaud you for citing technical reasons. Unfortunately way too many folks here are demanding Windows 7 because "Windows XP is outdated" which isn't a legitimate reason.
Instead of claiming IT management is a failure because they aren't blindly upgrading everyone, I reserve judgement and realize perhaps they are simply saving money by not upgrading the secretary to Win7 because XP runs her copy of Office 2003 just fine.
Looking at the replies to the grandparent comment reminds me of why I have despised IT folks before (even having been one), and why I'm so blessed in my current life.
When IT is trying to impose work patterns on devs, there's something seriously wrong. Either you've got horrible devs and/or dev managers, or your world view is extremely skewed. The same goes for IT dictating editors and tools. I can see discussions about allowed ports and such for in house applications, but if IT is preventing the development of software that a customer has put network requirements forth for, and IT is telling dev they can't do it, that's a serious problem.
Most of the IT requirements (at least for me in govt) are dictated well above the IT department. The IT guys at the working level have the displeasure of realizing that a lot of what they do, while necessary, is a hindrance to the end users in some fashion. Try not to bust their balls too much. Now as you go higher up the chain of command and you get non-technical manager types making technical decisions. Those are the guys that don't really understand the impacts at the working level, and often don't care because their raises depend on compliance and minimizing security problems (real or imagined) and not whether the R&D guys meet their goals.
Honestly, most of our software dev types are dangerous. A few barely understand what an IP address is and are heavy users of basic helpdesk support. A few some get upset why I tell them they can't use their personal laptop for handling proprietary work products. Do they need to? Not really. But they do need to recognize that the IT and network admin types have to look at the big picture and enforce things like firewalls for their protection.
You should have wireless networking in the first place.
Your job is not to manage what websites users go to. If their boss wants them to play on facebook all day, it's none of your damn business as the IT dept.
You should be keeping flash player updated in the first place.
You should facilitate installing any required software for them to do their jobs as soon as it is bought and paid for instead of whining about supported software lists.
You have an attitude problem.
- No wireless unless there is a legitimate need.
- I do keep flash updated. It's the other user-installed plug-ins that I don't know about that worry me.
- Let me know about the software ahead of time, so I tell you if it'll even run on your computer or is compatible with everything else.
- I possibly do have an attitude problem. I can't help you get your job done if treat me as the enemy instead of a technical resource.
What exactly does Windows 7 provide you as the end user that Windows XP does not? My main reason for rolling out Windows 7 is that it has better centralized management and security features. Something I doubt an end user cares about. The non-tech types seem to care more about eye candy. Also consider that Windows 7 needs more horsepower and it not supported on older hardware, so if XP is working just fine, why replace the entire computer ahead of the normal lifecycle? Some systems that lots of memory, and for that I definitely go with Win7 (XP64 was a piece of crap).
I have a mix of users who want the latest Office 2010, and a more reasonable crowd who still want to stay with 2003. They don't see any benefit to the newer version and don't want to waste time learning a new GUI.
I don't care about minor software from trusted sources. Just don't start loading on crap or shareware that comes from untrusted sources (screen savers, your favorite widget, Flash, google desktop) and presenting a security risk by opening up vulnerabilities. If you have a legitimate need, you might try asking IT what other users are using. Then at least there aren't 20 different flavors of the same utility on the network.
Speaking of outdated, you probably want Cygwin for the shell environment? That's outdated, learn powershell. (I have cygwin in my office for other valid reasons, like reading solaris tar tapes).
Usually upper management insists on draconian restrictions upon the recommendation of IT who are trying to maintain their power and control. Scare the crap out of the pointy haired boss, you can do what you like as long as you say it is in the interests of security. Time to do away with in-house IT and move to utility. Put it up on the cloud and you don't have to deal with prima donna "tech support" or tech that goes out of date or security breaches etc.
Most people dislike IT, because they won't let them do what they want with the computer ("I like Mozilla better", "I prefer Office Office", "Why can't you fix the corporate apps to work on Linux version 346?"). Moving stuff into the cloud is an even bigger step towards standardized services, so how is that an improvement?
A decent idea, except you can tell in the registry whether it was a usb mass-storage device or not.
http://www.forensicswiki.org/wiki/USB_History_Viewing
Wireless-N is probably not a necessity since it's bandwidth is probably much larger than your pipe to the outside world. There is some benefit to having the "last-mile" to the end user to be the bottleneck. so that one person can't gobble up all your cablemodem's bandwidth. Or you need to setup QOS or throttling to ensure a fair distribution of bandwidth. I guarantee at least a few of the RV'ers will try running NetFlix movies, at which point you're back to square one with people complaining that the interweb is slow.
Is the english list translated from the URDU list? Perhaps the URDU list doesn't have words with such dual meanings as 'screw' and 'period'.
Probably not your latter point, many of the bottled water cmpanies are soda companies.
I'm always amazed that the Soda bottlers managed to take their product, leave out the flavoring, sugar and carbonation and then sell it to consumers at a higher $/ounce price.
Seagate published a paper to justify why they went with 128-bit AES. The bottom line is that 256-bit encryption impacted disk throughput. That said, their Momentus 7200 FDE line is just as fast as their non-encrypting line.
http://www.seagate.com/staticfiles/docs/pdf/whitepaper/tp596_128-bit_versus_256_bit.pdf