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• How to calculate bandwidth limits per user on WiFi network

  - by Lars

  A typical 802.11g access point can provide around 25 Mbps of bandwidth. How is the bandwidth shared among the users? Furthermore, how many users can be served by a single access point using 802.11g in an environment with low interference, and average web activity from the users? The goal is to use bandwidth limitation to avoid starvation for some users in case some of the users start to download a file or stream HD video or some other bandwidth intensive activity. Can someone break down the math on this?

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• Is there any Mac Pro hardware parts that can ONLY be purchased thru Apple?

  - by bigp

  I'd like to know if I need to be concerned about any hardware parts that I should include in a brand new Mac Pro purchase, instead of trying to hunt it down on 3rd party vendors (or whitelist vendors / hardware suppliers). The main components I'm interested for "upgradeability" are: Processors (If starting with Two 2.4GHz Quad-Core "Westmere"); RAM (If starting with the least possible, which seems to be 6 x 1GB); Video Cards (If starting with one ATI Radeon HD 5770, can a 2nd one be purchased elsewhere?) Hard-Drives (Since these are mounted in specialized trays [if I'm not mistaking], are they also sold elsewhere? And can they be bought as SSDs?) Power Supply (Do I need to be concerned about this at all, or does it auto-adjust depending on the new component upgrades?) I just want to be sure by choosing a Mac Pro with lower component specifications that I can in fact purchase upgrade parts cheaper elsewhere. Thanks!

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• Where does the temporary flash file get stored when I am viweing from Firefox

  - by Nishant

  I am watching a lecture and it seems to be adobe flash ...I wanna save this video that I am viewing . The website I am checking is http://cs75.tv/2009/fall/ . I am using Firefox . Dont know if this info helps , but .... My about:cache result is this . Memory cache device Number of entries: 212 Maximum storage size: 13312 KiB Storage in use: 8087 KiB Inactive storage: 6819 KiB List Cache Entries Disk cache device Number of entries: 3224 Maximum storage size: 500000 KiB Storage in use: 26066 KiB Cache Directory: C:\Documents and Settings\nvarm\Local Settings\Application Data\Mozilla\Firefox\Profiles\d74svniy.default\Cache List Cache Entries Offline cache device Number of entries: 0 Maximum storage size: 512000 KiB Storage in use: 0 KiB Cache Directory: C:\Documents and Settings\nvarm\Local Settings\Application Data\Mozilla\Firefox\Profiles\d74svniy.default\OfflineCache List Cache Entries

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• Where does the temporary flash file get stored when I am viweing from Firefox

  - by Nishant

  I am watching a lecture and it seems to be adobe flash ...I wanna save this video that I am viewing . The website I am checking is http://cs75.tv/2009/fall/ . I am using Firefox . Dont know if this info helps , but .... My about:cache result is this . Memory cache device Number of entries: 212 Maximum storage size: 13312 KiB Storage in use: 8087 KiB Inactive storage: 6819 KiB List Cache Entries Disk cache device Number of entries: 3224 Maximum storage size: 500000 KiB Storage in use: 26066 KiB Cache Directory: C:\Documents and Settings\nvarm\Local Settings\Application Data\Mozilla\Firefox\Profiles\d74svniy.default\Cache List Cache Entries Offline cache device Number of entries: 0 Maximum storage size: 512000 KiB Storage in use: 0 KiB Cache Directory: C:\Documents and Settings\nvarm\Local Settings\Application Data\Mozilla\Firefox\Profiles\d74svniy.default\OfflineCache List Cache Entries

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• Where does the temporary flash file get stored when I am viweing from Firefox

  - by Nishant

  I am watching a lecture and it seems to be adobe flash ...I wanna save this video that I am viewing . The website I am checking is http://cs75.tv/2009/fall/ . I am using Firefox . Dont know if this info helps , but .... My about:cache result is this . Memory cache device Number of entries: 212 Maximum storage size: 13312 KiB Storage in use: 8087 KiB Inactive storage: 6819 KiB List Cache Entries Disk cache device Number of entries: 3224 Maximum storage size: 500000 KiB Storage in use: 26066 KiB Cache Directory: C:\Documents and Settings\nvarm\Local Settings\Application Data\Mozilla\Firefox\Profiles\d74svniy.default\Cache List Cache Entries Offline cache device Number of entries: 0 Maximum storage size: 512000 KiB Storage in use: 0 KiB Cache Directory: C:\Documents and Settings\nvarm\Local Settings\Application Data\Mozilla\Firefox\Profiles\d74svniy.default\OfflineCache List Cache Entries

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• Should I limit end-user gigabit ports to avoid saturating uplink/trunk connections?

  - by Joel Coel

  We have a campus with 16 buildings and older 850nm 1Gbps fiber links between the buildings, that all come to a core switch for our servers that also uses 1Gbps ports. We're finally starting to replace our aging 10/100 end-user switches, and much of what we're looking at are 1 Gbps units. My question is, since the trunk/uplink lines are still 1Gbps, if I were to install 1 Gbps switches for end users, should I limit the ports to 100Mbps until I can also upgrade the trunks to avoid allowing a bad-behaving host to saturate a trunk line (since we're a college, we have plenty of mis-behaving hosts) and thereby create a DoS situation for a building, or will TCP congestion control typically take care of that for me? What if we have a lot of UDP traffic (games, video chats, even a small amount of bittorrent)?

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• Why does text look so Horrible on my HD monitor?

  - by Laura

  I just bought a 1080p 22" Samsung Syncmaster 2333HD (connected via HDMI) and the picture and video quality is great but the text quality is absolutely horrible. This monitor has a built in HD TV tuner. Even as I type now all the text in this text box as well as in the browser toolbar and start menu, etc looks weird - like it all has a white outline around it that makes it jagged and hard to read. It hurts my eyes just to look at it. I am running my PC in the suggested native resolution of 1920x1080, so what's the problem? Is this one of the unavoidable downsides of using a HD monitor? Is there a solution to the problem?

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• Storage setup for large files

  - by Mecca

  I need to store over 200TB of data (all types, biggest being video files) and be able to access it over a local network. The files will be accessed for editing or searches. I don't need versioning, but a setup that would keep me safe from harddrive failures would be nice. Right now the content is on different harddrives, some external drives, some regular. I don't exclude the possibility of buying new/extra drives if necessary. If they will ever be exposed to the web, it wont be to the public, but just a couple of people. I have no idea what to buy to make this happen. I see some NAS solutions over the internet like this http://www.bestbuy.com/site/a/2266043.p?id=1218317764591&skuId=2266043 but the storage is not enough, plus it doesn't seem to be scalable. What do you recommend? Thanks

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• Cheap, light, small Skype laptop?

  - by roufamatic

  My wife and son are heading out while I stay home to babysit some contractors. We discussed getting her a small, cheap laptop that would primarily be used for Skype. Good quality integrated video & mike are prerequisites, as is Windows (though I'd entertain OSX). Doesn't need to be large, a 12" screen is probably fine. If I went new, where should I look? And if I were going to test the used/craigslist waters, what specs are we talking about?

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• USB webcam detected in KVM, but doesn't work

  - by Gene Vincent

  I have installed XP in a virtual machine running on Linux with QEMU/KVM (qemu-kvm-0.11.0-4.5.2). I export my Linux webcam to KVM using the switches "-usb -usbdevice host:046d:0929". The XP guest sees the webcam and the drivers install, but the camera only shows a black image. When I open the camera in Windows Explorer, it says "0 images" and a black image, while on a real XP, it says "1 image" and shows the video from the camera. I tried the same with a different webcam, but the result is the same. Any ideas what might be wrong or how I could debug this ?

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• Samba PDC plus universal folder

  - by skids89

  I know how to configure samba on my ubuntu box to become a PDC however I need some select files to be accessible to multiple users. These files are beyond their personal files. I.E. users A-C need to be able to access a schedule saved as a spreadsheet. But user D does not and users B-D need to be able to access confidential employee info but user A does not. How do I set this up on top of the PDC structure? Any video tutorials would be a plus. Im new to linux so documentation is a confusing slow slog to learn. Thanks so much in advance!

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• Map a drive to root of a server (\\sever) in Vista

  - by Andy T

  Hi, In Win XP, I can very easily map a network drive to the root of my NAS server. I browse to it in Explorer (\192.168.1.70), choose "Map Network Drive", choose the drive letter, done. In Vista, this does not seem possible. I have to go "Map Network Drive" from 'Computer', then enter the address, but it will only let me map to specific shares (sub-folders off of the server root) and NOT to the server root share. Since my NAS has built-in shares (music, photo, video, etc.) then I would have to have drive letters for all of these, which I absolutely don't want. Can anyone tell me - how come I can easily map to the server root from XP, but not in Vista? Is there something fundamentally different in the networking across the two OS's? Or do I just need to do things a different way? Hope someone can help. Thanks, AT

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• How do I publish a Power Point Presentation that is High Quality and no lag on the Web?

  - by Luke Hutton

  I have a ~22MB Power Point Presentation (2007) that I need to be presented on a website for viewing. The file contains audio over several slides and some embedded images. What is the best practices or best way to present the presentation so it gets delivered the quickest and best quality to users? Some ideas I've thought of are: Somehow compress the file (.wav audio files, images) into a smaller presentation and save it as a Power Point Show (pps) so users can download it and use the free Power Point viewer? Convert it to video format (.avi) or something and stream it off the web? (Hopefully freeware) Save it as a web page? (but then it's only viewable in IE I believe)

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• Windows 7 Long Delay on Login or Unlock

  - by Adam Driscoll

  I have a clean install of Windows 7 x32 running on my HP DV6449us and am experiencing a really long delay (10+ seconds) when unlocking or logging into my computer. The same issue was happening with UAC but I was able to turn that off. I realize this is a security risk but couldn't take it any more. I've read about this being video driver related but have updated the drivers to the newest I could find for the GeForce Go 6150. Anyone else experiencing this? My desktop is very happy but he's sporting a Nvidia 260 GT. Is it just the lack of firepower?

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• Flash stream makes my internet slow and cpu rush

  - by user1225840

  When I try to watch a live Flash stream, my CPU usage goes up to 75% and my Internet speed goes down. If I run a test before the video-stream, my speed is ~40/10Mbps and during the stream it drops to 0.1-0.5Mbps. The stream is laggy and I can only watch one to two seconds at a time, start/stop/start/stop. I have cleared my history, cache, cookies, temp files, and so on. I have searched for malware and took care of that. I have updated my drivers, reinstalled Flash and everything else I can think of, but it remains slow. I had this problem before and it just started working normally from one day to another. Could it be a hardware problem?

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• Articles of x386 and later CPU based systems

  - by user32569

  Hi there. I know this is hard question, and possibly not to be answered here, but if there is some article, or more you know about, please post a link. About books, its sad but many great computer books cannot be bought in my country. So, you can find many articles online, which says how memory was mapped back in pre x386 CPU. How there was explicit holes ready for MMIO BIOS, Video BIOS, etc. How there was A20 line for allowing higher memory access etc. Problem is, time changed. Today BIOSes are many times larger, and pure x86 16bit mode is used for booting and ROM flashing only. OS ignore BIOS as they access everything using drivers. And I just want to know, how it works today. I know not so specific question, but I read OS dev wiki, many articles, but all refering to days before massive usage of pure 32bit CPUs.

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• Problems with webcam

  - by Murtaza

  My friend is using Windows 8.1, and he has a webcam. He says it is working very well even without installing drivers. Webcam is A4tech - PK-331F. I asked for this webcam for use. I plugged in the webcam, and Windows detected it and installed drivers automatically. Then I opened Skype to check the webcam. I got a message from Skype that said, "Your webcam has microphone." When I clicked over it, it directed me to sound settings where it showed that the webcam microphone was working. I went to video settings, but the webcam wasn't listed there. As you can see in the image, the webcam is not listed. It is listed in Device Manager but isn't listed in Skype. I am using Windows 7 Professional. Any idea why this is happening?

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• Uploading with browser makes all other browser tabs and devices disconnect

  - by fabsenet

  Whenever I upload a video to YouTube all other browser tabs behave like there is no connection at all. It even affects my phone and other computers on the network therefor I think it has to do with my router. When the upload is done everything works normally again. I never observed this behavior with any other upload. My router is a Fritz!Box 7390 and my uploading PC is connected through a 1000mb/s switch (wired) to the router. Uploading through another browser does not change anything. I understand that other sites become slow as the network resources are limited, but stopping altogether feels wrong. speed.io measures for my internet connection: 40.894 Kbit/s down, 2.685 Kbit/s up, 29 ms ping, 2.048 con/m connects

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• Tool to make screenshot-based "screencast"

  - by liori

  Hello, I'd like to make a simple animation: some screenshots with added text. Something like screencast, but simpler, no audio... and hopefully very quick to produce--this is my main requirement. Googling for "screencasts" gives me full-blown tools to record video and audio, and I don't need them. I can make screenshots manually, then add text in GIMP... but maybe there is something easier, quicker? Very preferably something that works on Linux.

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• USB webcam detected in KVM, but doesn't work

  - by Gene Vincent

  I have installed XP in a virtual machine running on Linux with QEMU/KVM (qemu-kvm-0.11.0-4.5.2). I export my Linux webcam to KVM using the switches "-usb -usbdevice host:046d:0929". The XP guest sees the webcam and the drivers install, but the camera only shows a black image. When I open the camera in Windows Explorer, it says "0 images" and a black image, while on a real XP, it says "1 image" and shows the video from the camera. I tried the same with a different webcam, but the result is the same. Any ideas what might be wrong or how I could debug this ?

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• Dell Vostro 1510 slow boot

  - by pkswatch

  I have an old Dell Vostro 1510 with Ubuntu and Windows 7 on it. When it is switched on, it shows the following message: NO TPM OR TPM HAS ERROR SYSTEM BIOS SHADOWED VIDEO BIOS SHADOWED Then it waits on the same screen for about 70-80 seconds before showing up the grub. I read about tpm problems but did not get anything about shadowed problems. So my guess is tpm isn't the reason for this slow booting (am I right?) But then what is it exactly? Please help..

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• Ideal laptop specs for a Computer Science Masters student?

  - by Ayush

  I have a HP pavillion core 2 duo 2 GHz and 4 GB RAM, and it is painful to use this machine for any kind of coding. Eclipse (especially Juno) literally takes 5 minutes to load. And even after that, everything is lagy. Apart from school stuff, I also use my computer as a television. I watch Hulu, Netflix, YouTube etc in 720p, and this laptop gets hot as hell and the fans are loud enough to wake somebody up from deep sleep. I DON'T use my laptop for Gaming or Video/Photo Editing. I'm looking to buy a new laptop (in which most widely used IDEs would work smoothly and playing hi-def videos wouldn't be too much for the machine to handle) any suggestions (on hardware specs) would be greatly appreciated. Thanks

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• Transferring analog media (VHS casettes, vinyl records) to PC

  - by Javier Badia

  I have some VHSs and vinyl records which I'd like to convert to DVDs and CDs, respectively. I have a couple of questions about how to hook the devices up to the computer. I've seen some RCA-to-USB cables on the Internet like this one. Will those work for connecting the VCR to the computer? And what program would I use to take that and save it as a video file? Can I connect the phonograph directly to the Line In port in my PC or do I need some amplifier or something in the middle? I'm using Windows 7 x64, if it matters.

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• Apache Tomcat 6.0.29 startup causing Win XP SP3 reboot

  - by Liam

  Some of our Windows XP Developer machines die (black screen - no ping) when starting up Tomcat from a console. This only happens if the Tomcat debug console window is displayed (not minimised). When minimised, the startup / run is successful. I've checked for Tomcat logs and the crash sessions produce empty (zero bytes) tomcat log files. No system logs exist and no crash dump is created even though this is enabled in the Windows settings. The machine is dual screen and another machine with the same image has the same issue. The only clue is just before the crash, one of the monitors the system reports "Cannot display video mode 1280x1024" (approximate error, didn't write it down). Is there a way I can get Windows to produce log files of this crash session? Beyond running Tomcat as a service / minimised window, how can I fix (or even investigate)?

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• Windows 7 file sharing password protecting or making stuff available to just me

  - by Carbonara

  Even with the new Homegroup feature I'm still finding the way Windows deals with folder sharing utterly baffling. Here's what I want to do. I have two computers, a PC Desktop and a laptop. I also live in a shared flat with other computer users. I have set up a Homegroup and a Workgroup on the desktop and joined them on the laptop and in the home group I have shared video, music and pictures. This is so that anyone on the network can view pictures and listen to music etc. But I want my Documents folder from my desktop to only be available to me on my laptop and not to anyone else that may be on the network. The Homegroup only allows (from what I can gather from the baffling array of options) sharing with everyone or no one. Is it possible to only allow the laptop to access the documents folder on the desktop? The user name and password are the same on both computers.

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