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• How do I recover lost/inacessible data from my storage device?

  - by TomWij

  What steps can I take to try to recover lost or inaccessible data from any storage device? Answers: This applies to any main storage devices; eg. internal/external hard drive, USB stick, Flash memory. The most important thing is to STOP using it, any type of I/O can ruin your chances of a recovery. Click here in case you suspect corruption or bad sectors. Click here in case you suspect mechanical issues.

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• Problem with bios update on Intel S3420GP

  - by wurlog

  I am using the Intel Develepment Assistant CD, but after choosing the newest update I can see a red text but just for a second. Afterwards it tells me to reboot, but it is still the same bios version as before. I can't find access the error message. The whole software seams to be a linux. Maybe I can access a console and look into the log files?? Or are there other solutions to update the bios? EDIT: I tried to download the bios/firmware update packages (using it via network share, because the usb stick wouldn't work), but the software wont use it.

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• How to force my laptop to use the discrete GPU?

  - by Anton Roth

  My laptop (Asus X7BSV) is stuck using only the integrated GPU. It has a nVidia GT540M as well, but I cannot get it to work. I am using a Windows 7 x64 with latest drivers. This occurred after I attached an external USB monitor I need for work, and since then I cannot swap back to the nVidia GPU (dxdiag for example says that the primary GPU is the Intel integrated one). Asus support asked me to completely reinstall the system, but that is something I do not want to do. I checked the BIOS, there is no option as to what GPU to use. The nVidia card itself is working, since I can use CUDA on it, and it worked with a Ubuntu Live CD. In the nVidia software management I tried setting it to global setting, high performance GPU (nVidia), but that had no impact. What am I missing here? I did uninstall/delete all drivers and software related to the external monitor, but that did not help.

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• Multiple SSIDs better or worse

  - by swiss196

  I'm just setting up a network in a student house with 10 rooms, 3 floors. Configuration at the moment is as follows: Virgin Media 100mb Cable Virgin SuperHub on ground floor broadcasting on SSID1 Second AP(Edimax) wired on middle floor broadcasting on SSID2 These two networks server all 3 floors fairly well but I was wondering whether it would be better to setup an individual SSID for each floor (both the routers allow me to configure up to 3 ssids on each!). Would this help with speed issues, i.e if someone on the top floor is downloading/streaming etc, this wouldn't affect someone on the middle floor on a different SSID Or, will it have no effect? Thanks, Dave

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• Linux says a kernel module has an unknown symbol, but another loaded module provides it.

  - by raldi

  I'm trying to install a driver for a USB DAQ box, which annoyingly, I have to compile myself. I believe I've succeeded -- I have two .ko files: -rw-r--r-- 1 root root 45271 2010-03-18 21:24 advdrv_core.ko -rw-r--r-- 1 root root 24312 2010-03-18 21:24 usb4761.ko I was able to run insmod on the first without incident, but when I try on the second, I get a flood of messages: kernel: [686782.106547] usb4761: no symbol version for adv_process_info_check_event kernel: [686782.106555] usb4761: Unknown symbol adv_process_info_check_event kernel: [686782.106691] usb4761: no symbol version for advdrv_unregister_driver kernel: [686782.106695] usb4761: Unknown symbol advdrv_unregister_driver However, advdrv_core.ko provides these symbols. My kernel sure seems to have them in memory: # cat /proc/kallsyms | grep advdrv_unregister_driver f8d88504 r __ksymtab_advdrv_unregister_driver [advdrv_core] f8d888d2 r __kstrtab_advdrv_unregister_driver [advdrv_core] f8d885a4 r __kcrctab_advdrv_unregister_driver [advdrv_core] 086eb8fb a __crc_advdrv_unregister_driver [advdrv_core] f8d86e90 t advdrv_unregister_driver [advdrv_core] Why does my insmod claim they're unknown symbols?

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• Optimum number of threads while multitasking

  - by Gun Deniz

  I know similar questions have been asked but I think my case is a little bit diffrent. Let's say I have a computer with 8 cores and infinite memory with a Linux OS. I have a calculation software called Gaussian that can take advantage of multithreading. So I set its thread count to 8 for a single calculation for maximum speed. However I really can't decide what to do when I need to do run for instance 8 calculations simultaneously. In that case should I set the thread count to 1(total 8 threads spawned in 8 processes) or keep it 8(total 64 threads spawned in 8 processes) for each job? Does it really matter much? A related question is does the OS automatically does the core-parking to diffrent cores for each thread?

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• Exchange enrypted messages with a single recipient [portable]

  - by Andy

  I need to exchange encrypted messages with another party. These would be in the form of email like communication (not instant chat). The solution needs to be portable (USB stick). I've tried "Portable Thunderbird/Enigmail/Gnupg/Hotmail account" but it's just impossible to setup portable, countless meaningless error messages. Anyway, I would prefer something more straightforward. Notes: We won't know each others IP addresses. Our computers will often be switched off. Encryption would ideally be using a common password. Is there a solution to this?

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• Darik's Boot And Nuke - ERROR /dev/sda

  - by user1403844

  I'm trying to wipe the drive of an old company computer with DBAN so I can install Redhat Enterprise and learn Linux (it's a Dell Inspiron 1210, if that matters). I burnt DBAN to a CD and boot from that CD (running on an external USB CD drive). Whenever I try to run the utility--whether it's Autonuke, or any of manual wiping methods-- it spits on the errors: ERROR /dev/sdb ERROR /dev/sda From what I've read on some other forums, there are some issues with other drives or removable media interfering however I've disabled all other drives in bios, leaving just CD/DVD and the Hard Disk but still no luck. Any advice on how I can reconcile these errors and wipe the disk?

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• mplayer dumpstream sometimes fails

  - by User1

  I'm trying to rip the video at http://videolectures.net/ecml07%5Fgetoor%5Fisr/, so I can play it at a faster speed. I paste http://193.2.4.216/2007/pascal/ecml07%5Fwarsaw/getoor%5Flise/ecml07%5Fgetoor%5Fisr%5F01.wmv into a firefox browser in Windows and MediaPlayer plays the thing. However if I try mplayer -dumpstream, it gets stuck into an infinite loop trying to play the file. If I use wget to download the link, I get a small text file which basically points to the same URL. How can I get mplayer to download this stream?

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• windows 2003 - why can't serial port be accessed remotely?

  - by Danny Staple

  we have recently installed the updates on some of our servers, which have a bit of hardware attached via USB that presents itself as a serial (COM) port. The strange behaviour is that if I start a cmd shell on the server via VNC, I can open the serial port. If I run a service and start it from there (telnet, jenkins) then I receive a "not found" error for it. IE: C:\Documents and Settings\some_user>echo 1 >COM4: C:\Documents and Settings\some_user> on the local cmd will work, and on the remote telnet will give: C:\Documents and Settings\some_user>echo 1 >COM4: The system cannot find the file specified. C:\Documents and Settings\some_user> I cannot see any security settings on the Device manager settings panel for this device.

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• Webserver: Performance impact when storing session files on /dev/shm

  - by GetFree

  I have a website runing on a typical setup: Linux, Apache, PHP, MySQL. However, what's not typical about it, is that it's getting tons of traffic (400,000+ visits a day) and so, efficiency is becoming more and more important to me. I'm constantly looking for things I could optimize and, right now, my attention is focused on PHP's session files. There's a hell lot of session files constantly being read and created on the /tmp directory. So my question is: Is it a good idea to store the session files in /dev/shm (tmpfs) in order to speed things up a little bit??

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• CPU?: Not responding

  - by James

  I'm attempting to build a system for co-location. I've been running into issues while trying to install CentOS 6.3 System Specs: Motherboard: ASUS m5a99x Process: AMD FX-8120 (8-core Bulldozer) Memory: 2x 4gb G-Skill 2133 running at 1600 I keeps giving me an error message: CPU1: Not Responding. CPU2: Not Responding. CPU3: Not Responding. CPU4: Not Responding. CPU5: Not Responding. CPU6: Not Responding. Then it instantly restarts. I have tried installing it from USB, Multiple DVDs, Multiple Distros. I have also in the bios attempted to disable cores. I was able to disable 2/3 4/5 6/7. I have also ensured that there is zero overclocking. The system works fine in a windows environment. I'm out of ideas.

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• Intel Rapid Storage Technology - Raid5 is very slow

  - by Cederstrom

  Hi, I build a computer with a raid5, using the motherboards raid controller (ASUS P7H57D-V EVO - intel Rapid Storage Technology). The read and write are however very slow, when using the raid controller :( - I am using Windows 2008 R2, and when using the windows software raid, it was ok in speed - so there must be an issue with the controller? Im using 6 disks on 2TB each. Do anyone have any idea why its so slow, and how to fix it? I rather not pick the easy solutiuon of "just buy a raid controller" :| If you need more info about my setup, please just ask. Thanks :)

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• increase performance of virtual machines on the 27" imac

  - by evan

  I'm using a 27" iMac (i7, 8GB RAM) at work and normally run two or three virtual machines at the same time, which hurts the performance of each virtual machine. I've learned on these forums the best way to increase virtual machine performance (aside from RAM) is to have them running on a separate hard drive from the one the OS is on. Of course with the iMac you can only have one hard drive and not even an SAS or solid state drive (well you could probably take it apart and put one in yourself but I wouldn't be permitted to do that). That being said, do you think it would help to run one or more virtual machines from a firewire external drive (or a usb 2.0)? Thanks for your input!

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• Under what circumstances can/will a 10BASE-T device slow down a 100BASE-T or faster network?

  - by Fred Hamilton

  Suppose I have a 10BASE-T device, but everything else on my network is 100BASE-T or faster. When I attach the 10Mbit device, one of two things could happen: It could be passed through as 10BASE-T, making whatever it's connected to slow down to 10BASE-T, or It could be converted to a higher speed. I'm looking for all the plausible examples where #1 could happen; where attaching this 10Mbit device will slow down other traffic. I sorta think it can't happen - that as soon as it comes into contact with other traffic it has to get retimed to be inserted into the higher rate traffic (so no slowdown aside from the extra bits from the connection), and that when it's not contacting other traffic, who cares if it's only 10Mbit? Basically I'd like a better understanding of any impact of inserting a slow device into a fast ethernet network.

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• MS-DOS 7.1, Active-Boot

  - by user3005255

  I created a MS-DOS 7.1 (Win 98) active-boot USB-flash stick and it functions properly. Nevertheless I still have some unsolved issues: I want to change my keyboard-layout to german but I don´t know where to start since I only have the "basic-DOS" with IO.sys, MSDOS.sys + command.com. I already created Autoexec.bat + config.sys but don´t know which files I need and which I have to change in order to get a german keyboard. Also I can´t really shutdown my DOS properly, what is the right way to do it in MS-DOS 7.1? Thanks very much in advance for your help!

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• I need to access another user's files.

  - by CDeanMartin

  My system is an HP netbook running Ubuntu 10 netbook edition from a USB drive. I created an admin account and user account, and left in place the 'ubuntu' account. My netbook came with Windows 7 factory loaded and I did some work in Windows before setting up Linux. I copied my work into the HP Tools FAT32 partition that also came Factory Loaded, and was only 20% full. Only the 'ubuntu' account shows the HP Tools partition. So I would like to either view the partition from the 'admin' or 'user' accounts, or copy files from the partition-to a folder accessible from admin or user. I have already tried right clicking the folder, selecting share, and installing the share package, but I got a string of errors and would prefer a short term, one time solution that does not involve installing the share package. All I need is a few plain text Windows files i was working on.

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• Does SQLIO lie when run from a Hyper-V guest on a VHD?

  - by ScottStonehouse

  SQLIO seems like a useful tool. I thought it would be interesting to try to measure the speed difference between a physical disk and a VHD. So I ran SQLIO on the Hyper-V host on the physical drive. Results seemed reasonable. Then I ran it from the guest to test the vhd (on the same physical disk). I expected it to be a bit slower. But instead it was way faster - like 0ms average latency. So I'm trying to learn something here. It seems like hyper-v is fooling SQLIO somehow but I don't understand it well enough to figure it out. It's a dynamic vhd, no snapshots or anything, and the vhd is the only file on the disk. The physical disk is actually a two SAS drive RAID 1.

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• Formatting a disk for Macintosh using Linux

  - by Ken Bloom

  I've been asked to move data from an old external hard drive to a new one, and to make the new one compatible with the Macintosh. (The old drive's USB connection has died, and I'm connecting to old the drive using a PC card that provieds an eSATA to the drive. The recipient's Macintosh doesn't have a PC card slot, so she can't access the old drive anymore. Hence, the new drive.) Naturally, I'm doing this data transfer using Linux. I've discovered that I can format the drive as HFS+ using mkfs.hfsplus from the hfsprogs package. But I need to know: do I need to do anything special with the partition table? Is there a special Macintosh partition table format that I need to format this disk to? If so, what tools can I use to get the right format for the partition table?

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• Can't find second partition on encrypted drive with two partitions

  - by Thomas Uhrig

  I have a drive with two partitions, a system partition (Windows 7) and a partition just for data. Both are encrypted with the same password. I didn't had any problems, but yesterday my laptop gets broken. Now, I'm trying to connect the drive via USB to a new laptop and read it. The problem is, that I only see the system partition, not the one with my data. When I click on "Select Device", I can see my drive as "Harddisk 1" with 300 gb. But I only see a single partition "Partition1" with 117 gb. I'm unable to find the second one. It's not a hidden partition. Any ideas? Thanks.

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• Moving a window from a disconnected monitor to connected monitor on Vista

  - by RickMeasham

  I have a laptop that runs Vista Mega Ultimate Amazing for Business 64-bit. When at work, I connect a monitor via USB (which totally rocks) to the "left" of the laptop monitor. It's identified as monitor 3. At home, I use an old CRT monitor that sits to the right of the laptop monitor. It's monitor 2. Monitor 1 is, of course, the inbuilt laptop monitor. Now at home I open a window, any window, on monitor 2. Then I come to work and plug in monitor 3. Anything I had open on monitor 2 is now stuck in unretrievable land. (Actually, it's probably anything that was minimised when I left home that belonged on monitor 2 will expand back onto monitor 2, even though it's disconnected) How can I get those windows back onto connected monitors?

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• Re-Calibrate Toshiba battery meter with Windows 7

  - by Farseeker

  Hi All. I have a Toshiba U300 laptop. Back in the olden days (circa-2000) you could re-calibrate the battery meter from the BIOS when your battery was no longer reading accurately. My battery was shot, so I bought a brand new one, however Windows 7 still seems to count down the battery life in at the same speed as the old one did. This time, when it alleged 0%, I turned the laptop back on and got another 90 minutes of life out of it, at 0%. Is there a tool or utility for Toshiba laptops that can fix it back to being accurate? I've read the other threads on SU about cycling the battery but that just doesn't seem to do it in this case. Update: After the last cycle, the battery meter now reads 100% but the indicator on the front of the laptop is still orange (indicating not fully charged)

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• mac osx script - find mounted disc with name, copy file from desktop to it, when copy complete, unmount disc

  - by Joshc

  Is there some kind of mac script which finds a newly mounted disc drive that has the name 'EXAMPLE', then copies a file/folder to it and safely ejects the disc when copy has finished? I don't mind if the script needs to be executed by a short cut. And will it work if there are multiple drives plugged in? The reason I am asking is becuase i have 5000 usb memory sticks that I need to copy about 20mb worth of data to it. Thanks in advance for any ideas.

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• What is the simplest and fastest way to transfer large file through a Windows network?

  - by Sake

  I have a Window Server 2000 machine running MS SQL Server that stores over 20GB of data. The database is backed-up every day to the second harddrive. I want to transfer those backup files to another computer to build another test server and for recovery practicing. (the backup never actually got restored for almost 5 years. Don't tell my boss about that!) I have trouble transfering that huge file through the network. I've tried plain network copy, apache download, and ftp. Any method I tried end up failing when the amount of data transfered reach 2GB. The last time that I successfully transfered the file, it was through a usb attached external harddrive. But I want to perform this task routinely and preferably automatically. Wonder what is the most pragmatic approach for this situation ?

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• Installing linux on a crippled machine via network boot?

  - by networkbooter

  I have a somewhat ancient Toshiba laptop (which can't boot from USB) that I want to install linux on (probably Ubuntu). I'm currently running Windows XP and Ubuntu via Wubi. I want to delete these OSs and replace with Ubuntu only. The laptop does have a network boot option. I'm wondering if the easiest way might be to setup a network boot server on my other computer (which runs Ubunutu) and boot the laptop from it. Could this allow me to install Linux on the laptop? I can't seem to find instructions on the 'net as to how to go about doing this.

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