Does anyone actually use drives in a commercial environment that are more than 3-4 years old? By the time they are that old they aren't worth the space they take up and the power they consume, i.e. 1TB per form factor as opposed to 3TB in the same form factor.
I worked at an on-line service for several years way back in the late 90s and early 00s and this data is consistent with the data I collected then over perhaps an order of magnitude more units. While 25K drives may not be a lot in the scale of today's internet services it is more than enough to draw statistically valid conclusions, as opposed to that, oh, 1 drive in your desktop gaming system that failed 1 day after the warranty expired.
the ought to know better than to have that enabled at launch. You need to characterize the wheels on orbit and be sure that the limits are good before you turn that one on.
yup, and JWST incorporates a bunch of the pie in the sky ideas that have been floated in this thread like a giant sunshade and mechanical cryo-coolers.
Its a requirements thing. If the requirement is for 5 years of service then all the parts are life tested for the equivalent of 5 years. If the requirement was for 10 years of service the parts testing would cost a lot more. Because most of the subsystems are redundant even if some subsystems fail at 5 years the mission can continue longer. Generally, spacecraft last a lot longer than the design life anyway. Landsat 5 has been in use almost 29 years. ATS-3 was in use for 34 years. TDRS-1 was in use for 26 years. Nimbus-7 was another one that was in use for way longer than anyone ever imagined.
Low orbit satellites like this one are deorbited. Either they have to be designed for a controlled reentry into the ocean or be demisable, that is to completely disintegrate on reentry. Designing for dismisability is tough. You have to limit the size of all hard parts, and the harder they are the smaller the maximum size is. Off the top of my head, a titanium part can't be be bigger tham 2cm square, but aluminum can be 10cm square. Composites can be larger still.
exactly right, and in fact, the only thing that has kept the soviet, er, russian space program alive thus far was a decision by the Clinton administration in the post cold war era to allow US companies to launch their spacecraft on non US launch vehicles and to make space station Freedom (remember that?) into the ISS with the US paying Russia provide flights to it
Actually, in this case, the federal government IS mainly responsible for the success of IBM. Herman Hollerith won a contract from the US Census Bureau to provide machines to tabulate the 1890 census. That contract essentially ensured the success of the company which became IBM.
Determining total program costs for any DOD weapons system is a full scale research project. The money is appropriated in so many different piles and accounted for so many different ways its really hard to follow.
I tried to do this for the Titan program and failed miserably. I already have a full time job.
Camp Century appears to have been very similar to the original South Pole Station built in 1956-1957 for the IGY by the US Navy, minus the nuclear reactor and the plan for the Dr. Strangelove missile complex.
The Navy did install a small nuclear reactor at McMurdo Station, which leaked, requiring a large chunk of the hill that it was located on to be excavated and hauled away for disposal.
yeah, the guys that designed the corrective optics, the mechanism that deployed them, all the tooling, processes and procedures that were needed to install them and trained the astronauts didn't matter at all. It was all Story. Yup, he's the real hero.
who's going to be in bluffdale? almost nobody. Security, facility maintenance, remote hands and thats about it. The rest of the folks will be in your way on Rt 32 on their way home from work. Srsly, they are building office buildings where the Ft. Meade golf course used to be. Who do you think is going to be working in those?
I have my father's 1938 edition of Machinery's Handbook and the original Foxfire book. If I looked hard I could probably find a slide rule around here somewhere, not that I remember how to use it.
Apple moved ALL of its manufacturing from the US to China under Steve Jobs leadership. They employ roughly 40,000 people in the US and 700,000 contractors in China.
Slashdot Mirror
Does anyone actually use drives in a commercial environment that are more than 3-4 years old? By the time they are that old they aren't worth the space they take up and the power they consume, i.e. 1TB per form factor as opposed to 3TB in the same form factor.
I worked at an on-line service for several years way back in the late 90s and early 00s and this data is consistent with the data I collected then over perhaps an order of magnitude more units. While 25K drives may not be a lot in the scale of today's internet services it is more than enough to draw statistically valid conclusions, as opposed to that, oh, 1 drive in your desktop gaming system that failed 1 day after the warranty expired.
Repeal Obamatime!
happens all the time where I work.
public affairs photog says "do something scientific looking"
click
et voila
the ought to know better than to have that enabled at launch. You need to characterize the wheels on orbit and be sure that the limits are good before you turn that one on.
Thanks, that was a great article, but apparently it could still use more debunking, because that myth seems to be as firmly entrenched as ever.
Correct.
Essentially all rocket and spacecraft technology is on the US munitions list, whether it makes sense or not.
ho hum
wake me when the feds file suit
yup, and JWST incorporates a bunch of the pie in the sky ideas that have been floated in this thread like a giant sunshade and mechanical cryo-coolers.
Its a requirements thing. If the requirement is for 5 years of service then all the parts are life tested for the equivalent of 5 years. If the requirement was for 10 years of service the parts testing would cost a lot more. Because most of the subsystems are redundant even if some subsystems fail at 5 years the mission can continue longer. Generally, spacecraft last a lot longer than the design life anyway. Landsat 5 has been in use almost 29 years. ATS-3 was in use for 34 years. TDRS-1 was in use for 26 years. Nimbus-7 was another one that was in use for way longer than anyone ever imagined.
Low orbit satellites like this one are deorbited. Either they have to be designed for a controlled reentry into the ocean or be demisable, that is to completely disintegrate on reentry. Designing for dismisability is tough. You have to limit the size of all hard parts, and the harder they are the smaller the maximum size is. Off the top of my head, a titanium part can't be be bigger tham 2cm square, but aluminum can be 10cm square. Composites can be larger still.
wow, thats really interesting. why is it I never have mod points when I really want them?
he may not have a beard, but he does have an epic mustache!
Kickstarter, anyone?
exactly right, and in fact, the only thing that has kept the soviet, er, russian space program alive thus far was a decision by the Clinton administration in the post cold war era to allow US companies to launch their spacecraft on non US launch vehicles and to make space station Freedom (remember that?) into the ISS with the US paying Russia provide flights to it
Actually, in this case, the federal government IS mainly responsible for the success of IBM. Herman Hollerith won a contract from the US Census Bureau to provide machines to tabulate the 1890 census. That contract essentially ensured the success of the company which became IBM.
Determining total program costs for any DOD weapons system is a full scale research project. The money is appropriated in so many different piles and accounted for so many different ways its really hard to follow.
I tried to do this for the Titan program and failed miserably. I already have a full time job.
Camp Century appears to have been very similar to the original South Pole Station built in 1956-1957 for the IGY by the US Navy, minus the nuclear reactor and the plan for the Dr. Strangelove missile complex.
The Navy did install a small nuclear reactor at McMurdo Station, which leaked, requiring a large chunk of the hill that it was located on to be excavated and hauled away for disposal.
yeah, the guys that designed the corrective optics, the mechanism that deployed them, all the tooling, processes and procedures that were needed to install them and trained the astronauts didn't matter at all. It was all Story. Yup, he's the real hero.
The real driver behind the repair missions was this guy: http://en.wikipedia.org/wiki/Frank_Cepollina
who's going to be in bluffdale? almost nobody. Security, facility maintenance, remote hands and thats about it. The rest of the folks will be in your way on Rt 32 on their way home from work. Srsly, they are building office buildings where the Ft. Meade golf course used to be. Who do you think is going to be working in those?
those horseless carriages are just overpriced toys and they'll never amount to anything. For serious work, I'll take a horse and carriage any day!
seriously, you guys ought to listen to yourselves sometime.
they already use those. Mostly used over FOBs and larger bases
I have my father's 1938 edition of Machinery's Handbook and the original Foxfire book. If I looked hard I could probably find a slide rule around here somewhere, not that I remember how to use it.
Apple moved ALL of its manufacturing from the US to China under Steve Jobs leadership. They employ roughly 40,000 people in the US and 700,000 contractors in China.
are you outta your mind? Just a couple of days ago Newt said we were never in greater danger than we are today. It must be true if Newt said it.