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• Which would be more reliable for data archival - SD card or a generic USB thumbdrive?

  - by Visitor

  I've been thinking lately what should I preferably use for data storage and archival. I will say in advance that I do not use flash memory as the only storage media - I also keep my data on the hard drives and optical disks - flash memory is but one of the several backup solutions that duplicate each other. For the flash memory however I do have a choice - to use a generic USB thumbdrive or a SD card. Are there any indications that SD cards may be better and more reliable? From browsing people's review on the web I see that many complaints about USB sticks have to do with them completely failing, losing file system and stop being recognized by the OS. At the same time, most of the complaints for SD cards deal with just write speeds not holding up to the promise - failure reports are but a portions of those for the USB sticks. Are SD cards indeed more reliable? Am I also correct in my assumptions that SD cards use higher grade NAND chips than USB thumbdrives? At least, for class 10 cards, because the specification dictates the minimum performance and the manufacturers have to preselect better chips. While it is common for USB sticks to promise high speeds "up to XX MB/sec" but the reality is they very often deliver speeds 2-3 times less than promised. Do SD cards get better NAND chips and USB thumbdrives receive the discarded chips? Any thoughts would be appreciated.

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• Mechanics of reasoning during programming interviews

  - by user129506

  This is not the usual "I don't want to write code during an interview", in this question the assumption is that I need to write code during an interview (think about the level of rewriting the quicksort or mergesort from scratch) I know how the algorithm work or I have a basic idea of how I should start working from there, i.e. I don't remember the algorithm by heart I noticed that even on a whiteboard, I always end up writing bugged code or code that doesn't compile. If there's a typo, whatever I usually live with that.. but when there's a crash due to some uncaught particular case I end up losing confidence in my skills. I realize that perhaps interviewers might want to look at how I write code and/or how I solve problems rather than proof-compiling my whiteboard code, but I'd like to ask how should I approach the above problem in mental terms, i.e. what mental steps should I follow when writing code for an interview with the two bullet points above. There must be a unique and agreed series of steps I should follow to avoid getting stuck/caught into particular exception cases (limit cases) that might end up wasting my time and my energies rather than focusing on the overall algorithm for the general case. I hope I made my point clear

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• Need to upgrade DDR2 RAM on HP Desktop

  - by jds

  I have this HP Pavilion Desktop. As you can see, that page says the memory speed supported is PC2-4200. It currently has a 512 MB stick - CPU-Z Screenshots: hxxp://i41.tinypic.com/j5clj6.jpg and hxxp://i39.tinypic.com/20tldlc.jpg However, a crucial.com scan gives a slightly different report - hxxp://crucial.com/systemscanner/viewscanbyid.aspx?id=5718CFE831D926C3 It says the system can support PC2-5300 memory. So my question is which one should I trust? I want to upgrade the computer's ram to 2 GB (the maximum supported), because XP Media Center is giving me problems and I will install Windows 7 on this. PC2-6400 is the most common DDR2 memory I have been able to find here in the market. Will it cause any problems if I install 2 × 1 GB PC2-6400 DDR2 memory sticks (in dual channel) in this computer, (afaik, it will just run at the lower speed of 533 MHz, or whatever the motherboard supports), or do I absolutely need to get PC2-4200 sticks?

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• Supermicro MBD-X9DRL-IF-B and 8 X Hynix 4Gb DDR3 ECC dont boot

  - by Avi Keinan

  I have a custom build server with 2 Xeon E5-2609 and Supermicro MBD-X9DRL-IF-B. Right now the server has 4X Hynix 4Gb 2Rx8 PC3L-10600R-9-10-B0 HMT351R7BFR8A. and its working great. We baught another 4 from the same series of memory, when we installed all the ram (4 sticks already installed and we added 4 new sticks) the server didn't boot. When we replaced the current memory with the new memory - the server did boot. Right now we are in a problem because we need to extend this server ram but the motherboard don't run with 8X4Gb. Any ideas why? I have attached a picture with one of the current memory stick and one of the new memory stick. Thanks in advence.

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• I have been told to accept one error with Memtest86+

  - by DustByte

  Bought a new computer back in August with 4x4 GB RAM. Had problems with the RAM. They sent me four new sticks, which also generated errors. Singled out four sticks (from the eight I now had) that didn't generate any errors. Discovered by coincident a new RAM error last week (this time no BSOD). Contacted the company. According to them there have been issues with a bad stock from last summer so I got two tested 8 GB sticks sent to me. Been running Memtest86+ over the weekend. After 20 hours I got an error (see attached photo). The test has now been running for 37 hours but so far only this one error. I contacted the company where I bought the computer. They wrote back: I wouldn't worry about hat one fail. We have had similar situations here whereby it passes numerous times but then fails once. We think it's an issue with memtest, after all memory is faulty or it isn't so you can't really have it pass a few times, fail the next time around and then pass again! Please trust me on this and continue with the memory we sent you and if your problems continue we'll look at getting it replaced again. I gather from other forum posts that many people do not accept a single error. What could this single error signify, faulty RAM or a glitch in the MEMTEST program (or other)? Update: From the helpful comments below I conclude that an occasional (and rare) "random" error could occur and be acceptable, but repeated errors at the same address would indicate malfunction. Memtest has now run for 45 hours and I still have only one error. For everyone's information, I will keep running the test. In less than two days I am going away for a month. I will most likely leave Memtest running. As I do not have a UPS there is a risk that a power outage will ruin the experiment. The computer is a desktop so I cannot bring it with me (which would curiously have exposed it to more cosmic rays as I will be flying ;)).

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• Why does my USB stick not show up in Windows Vista?

  - by Kjensen

  Just reinstalled a Lenovo laptop with Vista. Two separate USB sticks, that work fine on another computer, will not show up on this Vista computer. USB ports work fine for other stuff. USB sticks worked before I reinstalled the computer. After looking around, I tried going into Disk management, to see if they appear there - they don't. Is there some sort of service, that might be disabled, not allowing removable drives to mount? Or what else can be wrong?

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• ideal memory configuration 4 bank, ddr3, AM3+ FX - 1 vs 2 vs 4 dimms?

  - by TardisGuy

  Ok, so ive been looking around, trying to learn and understand the way that ram works. Ive gotten one answer that said "The addressing is best for 2 sticks, and when you use 4; it slows down" Another answer said something like: Theres bank/channel interleave that makes the memory read like one stick Also I read something about the memory density also being a factor. I dug further and found out that theres a higher speed limit on my board for 2 sticks vs 4, so now im trying to put an image in my head of how and why, and... pfft. Can anyone explain, or recommend a resource that would answer these questions?

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• 2 GB of memory in 1 GB system is a problem?

  - by daveslab

  Hi folks, I just installed 2 1 Gig sticks into my friend's machine, thinking that it would take all the 2 GBs. Unfortunately, according to Dell's website, it says the maximum amount of memory accessible to the machine is arbitrarily set to 1 GB! The system indeed reports having 1 GB of memory accessible to it, but I'm worried that having 2 GB in there might break something. Are my fears reasonable? Should I buy two 512 MB sticks instead? Thanks for any help!

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• Could 1 GB of RAM work better than 1.25?

  - by user67082

  This is for a server running Ubuntu Server 10.10. The server is an old desktop PC. It had 2 sticks of 256 MB of 182-pin DDR 400 MHz RAM in it (total 512 MB of RAM). I just ordered a 1 GB stick of compatible RAM for the machine (now would have a total of 1.25 GB of RAM). A friend told me that it might run better if I removed both sticks of 256 MB RAM and used just the 1 GB stick I will be receiving. This seems counterintuitive since then there would only be 1 GB of RAM instead of 1.25; is it possible that it would be better to run with 1 GB or is he totally wrong? Thanks for the help.

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• Machine Check Exception

  - by Karl Entwistle

  When trying to install ubuntu-12.04-desktop-amd64.iso from USB I get one of the following errors http://en.wikipedia.org/wiki/Machine_Check_Exception states the error can occur due to -poorly fitted heatsink/computer fans (the same problem can happen with excessive dust in the CPU fan) -an overloaded internal or external power supply (fixable by upgrading) So I tried the following -Using rubbing alcohol to remove all the thermal paste from the CPU and heatsink, I then reseated the CPU after checking all the pins on the MOBO, everything seems fine. -Boot without the GPU to see if was the PSU that is being over stressed. -Removing all RAM apart from one stick and running a Memtest86 which it passed -Using Ubuntu 10.04.4 Desktop 64 bit (Different USB slots and USB sticks) -Using Ubuntu 12.04 Desktop 64 bit (Different USB slots and USB sticks) -Reset the BIOS using the Clear CMOS jumper -Removing all HD power cables and SATA cables -Updating the BIOS from F2 to F6 My PC is using the following parts. -Gigabyte GA-Z77-DS3H (F6 BIOS) -Intel Core i7 3770K 3.5GHz Socket 1155 -G-Skill 8GB (2x4GB) DDR3 1600Mhz RipjawsX Memory Kit CL9 (9-9-9-24) 1.5V -Be Quiet Shadow Rock Pro -Be Quiet Pure Power 730W Modular PSU -Sapphire HD 6870 1GB GDDR5 DVI HDMI DisplayPort PCI-E Graphics Card Any ideas?

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• Backtick (Grave accent) button sticking

  - by Scott Lemmon

  I have Ubuntu 12.04 running in a Virtual Box virtual machine, on my Windows 7 32bit system. It has been working great, except that the backtick/tilde button sticks(not physically). When I hit the backtick button it keeps repeating until another input button is pressed. So if I press the spacebar while the backtick is repeating, it stops, but if I press the shift while it is repeating, the backtick turns into a tilde, and the tilde keeps repeating until I release the shift key (at which point it's a backtick again and keeps repeating). This sticking behavior only happens with the backtick key, and only in my Ubuntu virtualization, never in windows. I've tried both my laptop's keyboard and an external USB keyboard and the problem happens on both. Both keyboards I've tried are Japanese 106/109 key layout, but I'm using them with a English(US) 101 profile. When I refer to the backtick key above, I mean where it is on the US layout. If I use the Japanese profile, the key in that location (the US backtick location) still sticks, but its no longer mapped as the backtick key. Any thoughts as to what might be causing this and possible solutions? I've searched a lot, but have not found any help so far. Any help is greatly appreciated.

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• Where to implement storable items

  - by James Hay

  I'm creating a multiplayer online trading game. The things that are traded range from raw items to complex products. For example Steel is a raw item. Mechanical Assembly is a more complex item that requires 2x Steel and maybe 1x Rubber. Then Hydraulics is an item that contains 2x Mechanical Assemblies and 1x Electronics (which is another complex item). So and so forth. These items will be created by me, players can't create their own items, so it doesn't need to be able to handle arbitrary layers of complexity for items. If my example isn't clear, think Minecraft. You have wooden planks, which can be made into sticks. From there the sticks - combined with metals - can be made into tools. My game is nothing to do with minecraft or any sandbox building game, but it uses a similar progressive complexity to creating items that I want to have in my game. My question is basically, how do you store something like this assuming that I will want to add more items in the future? Do you store it in a database or in a seperate library that the game uses? EDIT None of the items actually "do" anything, they are simply there to either sell, purchase, or combine with other items to make a more complex item, which can then be sold, purchased or combined... you get the idea. The items themselves would not have any properties, but the instances of the items would. For example an item that one player has would have a certain "quality" and if they were selling it a certain "price". An instance of that same item that a different player had would need to have a different "quality" and "price" if they were selling it. I think the price part will not be required on an individual item because instead I would have a "sale" object which was for a price and contained certain items.

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• How does a programmer think?

  - by Gordon Potter

  This may be a hopelessly vague question. But I am interested to hear whatever logical thought processes people go through when learning a new concept or trying to get their brain around code they might not have ever seen before. Basically, what general steps does one take to to break down problems and what does it take to "get it"? If you were to diagram a flowchart of how your mental process works when you look at code or try to solve a problem what might it look like? What common references, tips, and mental assumptions do you find useful in problem solving? How is this different between different domains? For example in what ways is a web programmer's thought process similar or different from a traditional desktop app developer's process?

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• How can I list the contents of a directory in Python?

  - by Paul D. Waite

  Can’t be hard, but I’m having a mental block.

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• Sybase ASE

  - by Linchi Shea

  I sat in a Sybase ASE class last week for five days. Although it didn't cover the more advanced features introduced in the more recent versions of Sybase ASE, the class did touch all the basics of administering Sybase ASE. While I was successful in suppressing any urge to openly compare Sybase ASE with Microsoft SQL Server in the class, I could not help making mental notes on the differences between the two database platforms. It's always interesting to look at how two DBMS platforms that share the...(read more)

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• Do any languages other than haskell/agda have a hindley-milner type system and type classes?

  - by Jimmy Hoffa

  In pondering what gives Haskell such a layer of mental pain in becoming proficient the main thing I can think of are the Monads, Applicatives, Functors, and gaining an intuition to know how a list or maybe will behave in regards to sequence or alternate or bind etc. But why haven't other languages presented these same concepts given the usefulness of monads/applicatives/etc? It occurs to me, type classes are the key, so the question is: Have any languages other than Haskell/Agda actually implemented type classes in the same or similar way?

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• How To Safely Eject Your USB Devices From the Desktop Context Menu

  - by Taylor Gibb

  If you are one of those people who don’t safely remove their USB Devices just because you’re lazy, here’s a neat trick to do it from the context menu on your desktop. Even if you are not lazy and just forget, the icon will serve as a mental reminder. So let’s take a look. How to Run Android Apps on Your Desktop the Easy Way HTG Explains: Do You Really Need to Defrag Your PC? Use Amazon’s Barcode Scanner to Easily Buy Anything from Your Phone

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• Now available: Schedule for Google I/O sessions & office hours

  If you’re attending Google I/O next month, you’ve likely taken a gander at this year’s sessions and made a mental note of ones you’d like to attend. (Or...

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• What do you do when working with multiple languages with different capitalization schemes?

  - by dvcolgan

  I'm making a webapp using Django. The Python convention for naming variables is lowercase_with_underscores, but the Javascript convention is camelCase. In addition, I've seen many people use lowercase-with-hyphens for CSS identifiers. Would you suggest using all three naming conventions where appropriate, or picking one and using it, even if the other two recommend something else? Switching back and forth isn't a huge problem, but it can still be mental overhead.

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• Tutorial: Controlling Your Linux System With fstab

  The /etc/fstab file gives you control over what filesystems are mounted at startup on your Linux system, including Windows partitions and network shares. You can also use it to control the mount points of removable storage devices like USB sticks and external hard disks. Akkana Peck shows us how.

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• Zombiewood for your Java ME tech-enabled Nokia C3

  - by hinkmond

  Zombies... Zoooombies... Here come the zombies in the new Zombiewood game for your Java ME technology-enabled Nokia C3. Watch the video to check it out. See: Zombiewood on Java ME Nokia C3 If you had two handguns and a couple sticks of dynamite, I'm sure you'd be looking to shoot zombies and collect giant floating gold coins spinning on the sidewalk. 'Cause that's what you do in that situation, right? Hinkmond

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• High end mobile workstations with pointer stick

  - by Elijah Lynn

  I am looking for a list of higher end mobile workstations that run Ubuntu/Kubuntu well and also have a hardware pointer stick. Here's an illustration of one (from sciencesurvivalblog): I wouldn't mind getting a Macbook Pro and wiping it but they refuse to use pointer sticks and to me, they are extremely efficient. I see a lot of potential for Lenovo thinkpads as well. System 76 said they have no plans to implement a hardware pointer stick so that leaves them out as well. Any ideas?

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• What's the problem with Scala's XML literals?

  - by Oak

  In this post, Martin (the language's head honcho) writes: [XML literals] Seemed a great idea at the time, now it sticks out like a sore thumb. I believe with the new string interpolation scheme we will be able to put all of XML processing in the libraries, which should be a big win. Being interested in language design myself, I'm wondering: Why does he write that it was a mistake to incorporate XML literals into the language? What is the controversy regarding this feature?

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• Live-Ubuntu 12.04 ran fine, now stopped booting!

  - by user89743

  I've seen similar problems to this several times in the forum, but mine is a bit different, so the other posts I saw were no help to me. When I boot Ubuntu 12.04 64-bit from live-SD-card (3GB persistence) I suddenly get this error: (initramfs) mount: mounting /dev/loop0 on //filesystem.squashfs failed: Invalid argument Can not mount /dev/loop/0 (/cdrom/casper/filesystem.squashfs) on //filesystem.squashfs (it says I can type "help" for commands, but I don't know anything about how to go from there, totally new to linux) The reason I say my case is different is because my Ubuntu worked fine for over a week, even pretty fast, and now this problem happened. Before that I used to run my live ubuntu from USB sticks but that was slower (especially when booting which took 15 minutes from USB stick!). Also I kept getting the same above problem after a while when booting and had to re-create a live USB linux several times. Installing on harddrive is not an option because my harddrive has physical damage and getting a replacement will take a while, therefore I can only use live-USB or live-SD-card Ubuntu. As I said I used Ubuntu without problems for more than a week, before that as well for several weeks on USB sticks, but the above problem occured sooner or later. This time I paid attention to when it happened: I was rebooting my computer (HP 620 laptop, 4 GB RAM, 64 bit system) from SD flash card and when I was booting I selected F6 and then the first option "no acpi" or something like that...I had used it before and noticed it slowed down the time it took Linux to use. This time it caused this error. Now even when I boot normally/default I get this error. Now I'm accessing Ubuntu from my USB stick without persistence file, when I check my SD card, all the files mentioned in the error message are there and the filesystem.squashfs is 691.2 MB so nothing seems to have been deleted by accident. (I have already made many changes/downloaded programs to my SD card persistent Ubuntu and would hope to loose them, since downloading is expensive for me, and since the problem seems to re-occur...) Can anyone help me, preferably without having to create another startup disk on my SD card? I'm totally new to this. Sorry for the long posts, just didn't know what info is relevant and what isnt! Kon

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• Unable to find good parameters for behavior of a puck in Farseer

  - by Krumelur

  EDIT: I have tried all kinds of variations now. The last one was to adjust the linear velocity in each step: newVel = oldVel * 0.9f - all of this including your proposals kind of work, however in the end if the velocity is little enough, the puck sticks to the wall and slides either vertically or horizontally. I can't get rid of this behavior. I want it to bounce, no matter how slow it is. Retitution is 1 for all objects, Friction is 0 for all. There is no gravity. What am I possibly doing wrong? In my battle to learn and understand Farseer I'm trying to setup a simple Air Hockey like table with a puck on it. The table's border body is made up from: Vertices aBorders = new Vertices( 4 ); aBorders.Add( new Vector2( -fHalfWidth, fHalfHeight ) ); aBorders.Add( new Vector2( fHalfWidth, fHalfHeight ) ); aBorders.Add( new Vector2( fHalfWidth, -fHalfHeight ) ); aBorders.Add( new Vector2( -fHalfWidth, -fHalfHeight ) ); FixtureFactory.AttachLoopShape( aBorders, this ); this.CollisionCategories = Category.All; this.CollidesWith = Category.All; this.Position = Vector2.Zero; this.Restitution = 1f; this.Friction = 0f; The puck body is defined with: FixtureFactory.AttachCircle( DIAMETER_PHYSIC_UNITS / 2f, 0.5f, this ); this.Restitution = 0.1f; this.Friction = 0.5f; this.BodyType = FarseerPhysics.Dynamics.BodyType.Dynamic; this.LinearDamping = 0.5f; this.Mass = 0.2f; I'm applying a linear force to the puck: this.oPuck.ApplyLinearImpulse( new Vector2( 1f, 1f ) ); The problem is that the puck and the walls appear to be sticky. This means that the puck's velocity drops to zero to quickly below a certain velocity. The puck gets reflected by the walls a couple of times and then just sticks to the left wall and continues sliding downwards the left wall. This looks very unrealistic. What I'm really looking for is that a puck-wall-collision does slow down the puck only a tiny little bit. After tweaking all values left and right I was wondering if I'm doing something wrong. Maybe some expert can comment on the parameters?

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