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• How to "paint" the data layer of a CD using a CD drive?

  - by Jens

  I am looking for software to "paint" geometric shapes, dots or lines on the data layer of a writable CD (or DVD) using a standard drive. These do not have to be visible to the naked eye; I'd try to abuse the small dot size on the CD for some scientific measurements. I am aware of the "LightScribe" feature of some drives and that is not what I am looking for. Most of the software available is of course limited to write music or data, on does not offer the low-level "place a dot at this radius, this angle"-functionality. Is there something out there for me?

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• How to tell if my sound card is listed in Device Manager?

  - by Bruhan

  The sound on my computer suddenly stopped working. When I check Sounds and Audio Devices in the Control Panel, I get "No Audio Device" with everything grayed out. When I check the Device Manager under "Sound, video and game controllers" I see the following list: Audio Codecs Legacy Audio Drivers Legacy Video Capture Devices Media Control Devices MPU-401 Compatible MIDI Device Standard Game Port Video Codecs None of these looks like my sound card. Of course, my sound "card" is not really a sound card, it's integrated with the nVidia-nForce motherboard. I'm running Windows XP. So is one of the above my sound device, or is the OS not detecting it? If the latter, how do I get it to detect it?

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• Move /var directories to to /mnt on an EC2 instance

  - by Geoff Lanotte

  I am trying to work on a standard configuration for a set of EC2 instances running ubuntu 12.04. These servers are going to be primarily web servers for a Ruby on Rails application. When you configure a new large instance, you are given a primary of 8GB and then ephemeral storage of 400 GB that is mounted to /mnt. It seems logical to me to move some directories that have a potential for growth off to the /mnt directory, I was specifically thinking of /var/www and /var/log. My question is two-fold: Is this a good idea or are there pitfalls that I cannot see? If this is a good idea, how should I go about configuring this. I do have the ability to configure new instances and down our old instances. My concern is over long term, doing this in such a way that it prevents downtime. I am a developer with some experience in devops, but mounting drives is something I have not faced before, so explicit directions would be greatly appreciated.

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• gunzip unexpected end of file

  - by Mark J Seger

  I like to write high volume data directly to a zip file via perl. Works like a champ! However, on some rare occasions I've found that gunzip can't uncompress them declaring an unexpected end-of-file. The thing is I can uncompress it with a simple perl script, which probably misses the corrupted record(s) at the end. My question is, does anyone know of a way to use a standard utility to do the same thing? Maybe with a 'compress-as-much-as-you-can' switch? -mark

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• Is Protune for video only or may be used for photo too?

  - by Green

  I have Hero3+ Black Edition. I can't understand if Protune is for video only or may be applied for photos? The manual says it is both for video and for photo (page 35): High-Quality Image Capture Protune’s high data rate captures images with less compression, giving content creators higher quality for professional productions. Film/TV Rate Standard While shooting in Protune, you have the option of recording video in cinema quality 24 fps to easily intercut GoPro content with other source media without the need to perform fps conversion. But at the same time their site says that Protune is for video only: To record Protune footage, you’ll need to turn Protune ON in your camera’s settings menu. What for is Protune? Photo? Video? Or both?

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• Cloud hosting and single hardware point of failure?

  - by PeterB

  From talking to sales I thought Rackspace Cloud was running on a SAN and compute nodes (as VMWare's offerings do), only to find out it doesn't, so when the host server goes down for maintenance all cloud servers on the server go down (in our case for 2.5 hours). I understand Amazon EC2 also has this single-server point of failure. Which cloud hosting solutions don't rely on a single server? I've yet to find a list by architecture Is there a term that distinguishes between these types of 'cloud'? Is one of these 'grid computing' and the other 'virtualisation'? Can a SAN backed solution provide the same reliability as 2 mirrored cloud servers on (say) Rackspace Cloud? I am more familiar with the VMWare architecture and would like to understand the advantages and disadvantages of each approach. I understand the standard architecture is to have multiple cloud servers and mirrored data between them; until we need multiple database servers I'm wondering if a SAN/node hosting solution would provide the lack of downtime we need without the added complexity.

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• Linux mdadm software RAID 6 - does it support bit corruption recovery?

  - by user101203

  Wikipedia says "RAID 2 is the only standard RAID level, other than some implementations of RAID 6, which can automatically recover accurate data from single-bit corruption in data." Does anyone know if the RAID 6 mdadm implementation in Linux is one such implementation that can automatically detect and recover from single-bit data corruption. This pertains to CentOS / Red Hat 6 if those are different from other versions. I tried searching online but didn't have much luck. With SATA error rates being 1 in 1E14 bits, and a 2TB SATA disk containing 1.6E13 bits, this is especially relevant to preventing data corruption. Thanks!

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• Connect macbook to my LAN through a VPN - best solution? [closed]

  - by LewisMc

  So I have a LAN connected via a ADSL/PPPoA, this is using a bog-standard DLink router supplied by my ISP (talktalk UK). I have a NAS within the LAN that is running FreeNAS and I want to be able to connect to it when I'm out and about. It's running an atom so it's quite low on juice consumption but I don't want to have it on all day and night so I've been waking it via a magic packet and booting it down from the web admin when I need it. So I want to connect to the LAN, I presume via a VPN, to be able to send a magic packet. But what is the best method to accomplish this, or is there an easier way? I've been looking at the cisco 857 integrated router and the Netgear prosafe 318(behind modem) but not sure If I'm on the right track with what I want to achieve as I've not much experience or knowledge with VPN's or networking (software engineering student). I have tried port forwarding but to no avail, either with magic packets or even connecting outside the LAN via DYNDNS. Thanks,

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• Can Windows Home Server be used on an active directory domain?

  - by Parvenu74

  The situation: an Active Directory network with a few dozen machines. Most of the machines have the same vanilla image applied to them so if there was a hard drive failure getting the machine back up to the standard network image would be quick and easy. However, there are a handful of (eight) machines which have rather unique setups (accounting, developers, the "artist" with CS4 and such). For these machines we would like to use Windows Home Server since the backups are automatic and recovery from a machine failure is quite painless. The question though is whether or not WHS can be used on an A/D network. If not, what "set it and forget it" backup/imaging product is recommended for this scenario?

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• howt setup remote access into computer behind 2 routers?

  - by Steve Wasiura

  I can setup remote access to a pc behind a single router/firewall by using NAT and Port Forwarding, simples! But there is a customer that shares an internet connection with another office, and they are behind a second router firewall. I drawed a picture with my crayons but I can't attach it because I'm a new account on SF. see it here: http://i.imgur.com/b3FDx.png So how would I setup remote access to the pc that is beind the second firewall? It must be something about static routes, i.e. if I hit the wan ip on port 4905 I want it to forward it to 10.0.0.30 by going through 192.168.1.10 so a route statement like for all requests to 10.0.0.30, use 192.168.1.10 ? and ass u me router 2 has a static gateway ip of 192.168.1.10 and need a standard NAT on router 2 to point port 4905 to 10.0.0.30 is this the right way, any tips? both routers are netgear consumer equipment. thanks

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• KVM Switch for a mac and a Windows (XP or 7) machine to share VDU

  - by Adrian Parker

  Have a MacPro (snow leopard) connected to an (windows standard) Asus 25" monitor via a DVI--VGA adapter. Now the boss wants me to work from home, so I want to share my Asus display with a Windows XP laptop. No doubt once my wife sees this, she will want to do the same thing, but with a Windows 7 laptop. So what I would like, I think, is your recommendations for a KVM switch (or better solution) that allows the Mac and a (windows 7 or windows xp) laptop to share the Asus display. Bonus marks if they can share Apple keyboard and magic mouse, but am quite happy to use separate mouse keyboards. The MacPro is the one that is always connected, the laptops come and go. Any ideas? Thanks in advance for any help.

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• Time Synch Architecture in Windows Domain Environment

  - by Param

  I just read the following article -- "In a domain, time synchronization takes place when Windows Time Service turns on during system startup and periodically while the system is running." ( http://technet.microsoft.com/en-us/library/cc779145%28v=ws.10%29.aspx ) From the above article i get to know that the first sync it take as soon as i start my system, but after that in how many minutes or second or in how many periodic interval my windows client ( Window XP, window7 or window server 2008 member ) synch with my Domain controller (PDC emulator )??? Do you have any idea, and how should i verify my synch time interval? My Domain Controller is Window server 2008 R2 Standard

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• Graphics drivers could not find compatible graphics hardware

  - by selak

  I have a desktop with Asus P5KPS/EPU motherboard and Nvidia GF 9600 GT Graphic Adapter. I just set up new windows 7. My problem is that I cannot find a good dirver for my Graphic Adapter. I've downloaded driver from Nvidia.com which say support my GF 9600 GT, but when I installed it, it said This graphics drivers could not find compatible graphics hardware. I go into safe mode, uninstall Standard Graphics Adapter that auto installed then install my Nvidia driver, still not work. Anyone can show me how to solve this problem?

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• Which has a faster data transfer rate? WIFI (tablet or cell phone, not LTE) or MicroSD (Class 10)?

  - by techaddict

  Which of the two methods of dta transfer trasfers data at a faster rate for smartphones and tablets? Standard WIFI, or MicroSD Cards? I wonder if it would be actually faster to access data on external storage then it would be to have the MicroSD card in my smartphone or tablet. Currently I have a class 10 32GB MicroSD card in my cell phone. I am looking to get the new Google Nexus tablet but it does not offer expandable internal storage. I wonder if that's really a detriment; because if WIFI is faster than MicroSD, then it would matter almost none at all that you couldn't expand the storage internally. If the case is that WIFI is faster, and people caught onto this, then people could save a lot of money on lower memory ipads/iphones/ipods, tablets, and smartphones!

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• How do you move files to Windows Server 2008 cloud server from local computer?

  - by Mausimo

  I recently setup a Windows 2008 R2 server on Amazon EC2. I now want to move an application I created on my local desktop to this server. However, having never done this before I have no idea how to transfer files from my local desktop to the online server. What is the standard convention for transferring files from local machine to the server? As a side note, why can I not download the .NET framework 4 .exe file? Clicking the download link does nothing... (it is already a trusted site)

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• My 386sx refuses to start in cold days

  - by Armadillo

  My old computer refuses to start in cold days. So, in really hot days (about 40ºC / 104ºF ) or even hotter, this PC usually starts, but in cold days, it wont. When the temperature is not in the "sweet-spot" the power light turns on for an half a second and then the computer turns off. But when it's really cold, not even the power light turns on, nor even a blink. Sometimes I use an Hair dryer, pointed directly to the PSU and that works great. 5 to 10 minutes is enough, depending on the ambient temperature. I think something is going wrong in my AT power supply. I can't replace this PSU for another because it has a non-standard size and connectors to power the motherboard. Does anybody have a clue about what it's failing in my PSU, so I can change that component (resistor, capacitor, ??, etc) and rock on with my 80386? Thanks

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• MacMini giving "no signal" when using the television resolutions (480p, 720p, 1080i)

  - by chum of chance

  I have a Mac Mini (10.6) with a DVI out to my 720p television. It shows the options for 480p, 720p and 1080i with a little television next to the icons, along with the stand resolutions like 1024x768. The standard resolutions work fine with overscan checked, but I can't get any of the native television resolutions to work. I only get a "no signal" on my television. The input on the television is marked with 1080i/720p/480p and yet only 480p (and the PC native resolutions like 1024x768) work. What's happening?

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• Make words look like keystrokes in Microsoft Word

  - by techturtle

  Is there an easy way in Microsoft Word 2010 to make words appear like keystrokes the way we can here in Superuser? Something like this: Ctrl + V I know that <kbd> is an HTML tag, but in normal HTML that just switches to a fixed-width font. In fact, that's how Word treats it if you paste something from SU into a Word doc: If there's not a standard way to do this in Word, is there a free font that might accomplish the same thing? I thought I'd seen some before but couldn't find any at the regular places I find fonts (dafont.com, fontspace.com).

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• Only allow root to change filesystem

  - by Uejji

  The VPS I manage uses a simple hard link rsync archive daily backup system saved to a loop file. This is great, because each backup only takes up as much space as what has changed each day, and all user/group permissions are kept. I would like to give users direct access to their home directories in each backup, but I'm worried about intentional or accidental backup data destruction, as how it stands now users can actually change, destroy or add to backed up data they originally owned. I've been looking for a way to mount this filesystem similar to an ro mount option, but something that would still allow rw access to root, but I've had absolutely no luck. In other words, I want users to be able to view and copy their backed up data without actually being able to change it, and have that data maintain the original permissions. I've got no real preferences as far as filesystem, as long as it's a standard unix filesystem that can preserve permissions, support hard links and deny write access to users without actually stripping the w permission from everything.

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• How can I let my users set PHP.ini settings for wordpress?

  - by jldugger

  I set up a wordpress server from a fairly standard Ubuntu 9.10 for a class and they're constantly running into problems with the default PHP.ini settings. First memory settings were too low, then the file upload limits were too small, etc. And more concerning was a wordpress wide blank page that I suspect was killed for ram consumption but turning on php errors in php.ini didn't reveal anything! I'm not familiar with shared hosting, but I feel there's a way such places allow users to edit such things without needing me to intervene and restart Apache.

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• Zeroing SSD drives

  - by jtnire

  We host VPSes for customers. Each customer VPS is given an LVM LV on a standard spindle hard disk. If the customer were to leave, we zero out this LV ensuring that their data does not leak over to another customers. We are thinking of going with SSDs for our hosting business. Given that SSDs have the "wear levelling" technology, does that make zeroing pointless? Does this make this SSD idea unfeasable, given we can't allow customer data to leak over to another customer? Thanks

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• LDAP loginShell on platforms with different paths

  - by neoice

  I'm using LDAP to deal with users and authentication across my network. I'm now adding FreeBSD hosts and have hit a problem with login shells. on Linux, shells tend to be in /bin/$shellname, so setting my login shell in LDAP to /bin/zsh works perfectly. on FreeBSD, /bin/zsh doesnt exist, I need to use /usr/local/bin/zsh. is there a solution to this? I imagine I might be able to make some sort of login-shell.sh script that LDAP passes out as the "shell" and then use the script to determine the actual shell for the user, but I'm not a fan of that idea. I'm using Debian and FreeBSD, both with a standard OpenLDAP/PAM/nss setup. edit: it looks like using /bin/sh and adding an exec $shell to .profile would "work", but that doesnt scale very well.

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• Postfix appears to ignore domain's MX records

  - by DisgruntledGoat

  On my dedicated server, I have Postfix installed for sending email through the websites. One of my clients hosts their email with a third party so we have MX records set up on the domain. However, when sending any Postfix emails from the server, they do not get the emails. I think since the domain is pointing at the server itself, it tries to send mail to itself, but there is nothing on the server to handle the email for that domain. (There are mail accounts for other domain which are working fine.) How do I get Postfix to use the domain's MX records to send email? Server is Ubuntu 8.10 with standard LAMP stack. I have Webmin installed, and a control panel called "Matrix" provided by the host.

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• Upgrading Fedora on Amazon to 12 but getting libssl.so.* & libcrypto.so.* are missing

  - by bateman_ap

  I am upgrading to Fedora 12 on a Amazon EC2 using help here: http://www.ioncannon.net/system-administration/894/fedora-12-bootable-root-ebs-on-ec2/ I managed to do a 64 bit instance OK, however facing some problems with a standard one. On the final bit of the install from 11 to 12 I am getting an error: Error: Missing Dependency: libcrypto.so.8 is needed by package httpd-tools-2.2.1.5-1.fc11.1.i586 (installed) Error: Missing Dependency: libssl.so.8 is needed by package httpd-tools-2.2.1.5-1.fc11.1.i586 (installed) This is referenced in the comments from the link above but all it says is: Q: Apache failed, or libssl.so.* & libcrypto.so.* are missing A: These versions are mssing the symlinks they require. Easy fix, go symlink them to the newest versions in /lib However I am afraid I don't know how to do this. If it is any help I tried running the command locate libssl.so and got: /lib/libssl.so.0.9.8b /lib/libssl.so.6

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• What is the "real" difference between a NAS and NFS? Or, why pick a NAS device over "mere" NFS?

  - by warren

  From an end-user perspective, what is the difference between a NAS device and using NFS exports from a file server? They seem to accomplish the same end result. The difference between a SAN and other file storage is related (in my experience) to how they are connected to the server infrastructure. However, the difference between a NAS, connecting over a standard ethernet port, and NFS (sharing storage off specific servers, also over the network), seems more nebulous. Is there a good reason to pick a NAS filer over just running NFS on servers?

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