Fedora :: Reading A Data From CD / Dvd Is Very Slow After Change Motherboard

Mar 28, 2010

Recently changed my motherboard. The new board has the 790FX/SB750 chipset, and the old board used the 770/SB600 chipset. Prior to the change, I had never had any problems reading/writing CDs or DVDs. I now find that reading a data CD is very slow, it can take up to 30 secs before the icon appears on the desktop and a filer window appears. In my tests thus far, only data CDs written on Linux can always be read, albeit slowly. Data CDs written on Windows are variable. Some are never seen by the system, others may or may not be opened. That is I might be able to read it during one test, and next time I try I can't.

When a CD is not 'seen', there is an initial flurry of activity by the drive, but the drive icon (in "Computer' window) doesn't think a disc is in the drive. I can boot OK off a DVD, and data DVDs wrtten on Linux are opened and read quite fast. I am running Fedora 12 x86_64 with the latest Fedora kernel package (, and the Motherboard bios is the latest available. The CD/DVD drive is a SATA Pioneer DVR-215. I have checked the bios settings, and have tried setting 'storage configuration' to IDE and to AHCI, each giving the same result.

I tried switching the SATA data cable from SATA-3 to SATA-2 and was able to open and read a Windows data CD that had previously not been seen, but subsequent attempts have failed to open and read that CD. I suspect the problem may have something to do with hardware drivers, but I really am guessing about this and have not been able to find any useful information on this.

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Red Hat / Fedora :: Can't Boot In After Motherboard Change / What To Do?

Apr 3, 2010

I've recently changed the motherboard of a redhat server that's been running fine otherwise. The new motherboard is different to the old one. I can't boot in now; getting "Kernal panic: VFS : Unable to mount root fs on 00:00" messages. I've run mkinitrd to rebuild the image file and have changed the grub.conf line to point to the new image file but it still occurs.

title Red Hat Linux (2.4.25)
root (hd0,0)
kernal /vmlinuz-2.4.18-14 ro root=LABEL=/
initrd /initrd.img.2.4.18-14

However; during the bootup I spy some "unknown IDE device" errors along with some "IRQ resource cannot be reserved" and/or "Could not enable IDE device" or similar messages. As per attached image.

I can detect the harddisk when I bootup using rescuecd and that's how i rebuilt the image file. I have tried changing the "ro root=" to "ro root=/dev/hda3" or other hdax figures; but still the same.

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Networking :: Serial Port : Read Data, Not Reading Complete Data?

Mar 5, 2010

I have an application where I am sending data via serial port from PC1 (Java App) and reading that data in PC2 (C++ App). The problem that I am facing is that my PC2 (C++ App) is not able to read complete data sent by PC1 i.e. from my PC1 I am sending 190 bytes but PC2 is able to read close to 140 bytes though I am trying to read in a loop.Below is code snippet of my C++ AppOpen the connection to serial port

serialfd = open( serialPortName.c_str(), O_RDWR | O_NOCTTY | O_NDELAY);
if (serialfd == -1)


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Fedora :: RAMDISK: EOF While Reading Compressed Data ...Kernel Panic - Unable To Mount Root?

Jul 31, 2010

I was following this tutorial on How install the rpmfusion nvidia drivers in Fedora 13Here's the tutorial:Quote:Originally Posted by leigh123linuxF13 Howto for the rpmfusion nvidia drivers This is a Three-Step Process. If you don't follow all three steps, your install will fail!1. Install the nvidia driver. ( if you have 4Gb of RAM or more you will probably have a PAE kernel [32bit only] so follow the PAE part )For GeForce 6, 7, 8, 9, 200 & 300 series cards

rpm -Uvh http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-


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OpenSUSE Network :: 11.4 Slow CIFS Reading

Jun 6, 2011

1. 11.4 x64.
2. Solaris SMB server.
3. Gigabit LAN
4. mounted shares from that server (fstab entries)

write speed: 80-90-100 MB/s read speed extremely slow: 3-4-5 MB/s (really funny - our administrator shoked, but i'm not fun, i need fast lan for work)But when i reboot to windows 7 - i have 60-70-80 MB/s in both directions. Read and Write - nice.What happened? kernel updated and all last updates is applied (exclude kopete-because i use old kopete with animated tray icon).I have to tried many tunes like: "noatime" "directio" and also in /etc/modprobe.d - put conf file with: options cifs CIFSMaxBufSize=130048

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Ubuntu :: Reading Data From Disk Into Memory

Jun 6, 2011

I have a simple C program that reads a 1 GB file from disk into memory.The first time I run this program, the process takes several seconds. But if I run this program again immediately after it finishes, the read happens almost instantly. What is going on here?My suspicion is that the operating system is realizing that the data I'm trying to read is still uncorrupted in memory (its been freed but not overwritten), so instead of reading it again, it just gives me the same block. I would really like to know what this process is called, or any Googleable keywords that would allow me to research it.

The reason I ask is because the size of my input data has increased. Now I need to read in a 6 GB file (my system has 12 GB of RAM), but I'm not observing the same behavior with the larger file. Each time I run the program the read takes an equally long time.

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Programming :: Reading Data From Multiple Files?

Mar 17, 2011

I have a folder which includes bunch of folders each having data files in them. [ Folder A has F1, F2 F3 ..... F1000 folders in it, and F1, F2, F3 ... each has about 10 different files named FILE 1, FILE2, FILE3 .... in them.

I am interested in File 1 of each Folder, because that contains the data I need in it. More specifically, that File1 s have a line "ANSWER=..." in them, and i need to get that value of the ANSWER from each file. So doing it by hand is so hard, so I need to write a script that will scan all folders and give me a list of values of eache ANSWERs.

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Programming :: Reading A File Of Data In An Array?

Feb 10, 2011

I have two files of data with different numbers of columns and rows. I want to read this two files in two arrays and then compare for example the second column of first data file with the third column of the other text file and if the difference between of two numbers is less than a threshold then the program print the information in the rows which fulfill this condition in the third text file. I have written below program but the problem is that it does not go through all rows of second file.

declare -a a
declare -a b
r=` awk '{n++} END {print n}' second.txt `
echo $r
awk '


Actually I have two data files one of them contains 44406 and the other one has 12066 rows and I want to check whether the difference between the components of two specific columns is less than a threshod but I have simplified it here. I had written this code and then I have realized that this code just goes through the number of rows as the same as the first.txt file and ignores the rest. I could not find the problem yet.

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Ubuntu :: Reading EXIF Data From TIFF Files

Aug 9, 2010

I'm having trouble reading EXIF data from TIFF files. Both 8 bit and 16 bit fail to load EXIF data via eye of gnome and GIMP and I'm not sure why. Neither files downloaded online nor rendered from Bibble 5 seem to work. Using Ubuntu 10.04 64bit and GIMP 2.7.2.

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General :: Reading The Manufacturer Data / Device ID On A USB Drive?

Jun 28, 2011

I wish to read the Manufacturer data and other details such as Device ID, Serial number on a USB drive.

1. Could anyone help me out with information on the memory structure of a USB drive? (which location is the mnfr data stored?)

2. Are there are any commands in Linux that will help in reading/accessing this data?

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Software :: Block Driver Error While Reading Data

Jan 22, 2010

i am writing sample block driver while reading data i am getting below error

i am not getting what is this error

BUG: sleeping function called from invalid context at kernel/sched.c:4684 in_atomic():0, irqs_disabled():1

Pid: 5364, comm: test_buf Not tainted #1
[<c041f1d4>] __might_sleep+0xae/0xb3
[<c063ae43>] wait_for_common+0x1f/0x117


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Programming :: Clearing Cache - Reading Data Upon Investigation

Apr 9, 2009

I have been saving an XML file wherein I shall be reading data, if and only if the XML is present on Hard Drive. If same is not present, the code shall generate first and next time it shall simply read and not jump into writing part again and again. The issue that I am facing is, I am deleting the file manually going to that location, and checking whether it is reading the data, upon investigation, I found that it is really reading the data although the file is deleted.

I suspected that there may be some cache issue from where it is picking values, hence it fired the command
"sync; echo 3 > /proc/sys/vm/drop_caches"
But it is still doing the same pattern.

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Programming :: Displaying I/O Possible When Reading Data From The Serial Port?

Aug 31, 2009

I have got a problem while reading from the serial port. I'm working on iMX-31 board and Eclipse IDE. Whenever I'm trying to read any data through the serial port, it's displaying I/O Possible and the application is being terminated. After reading I'm trying to write this data on a file. Here are the excerpts from the code:

# int main()
if (openport()<0)


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Ubuntu :: Pc Acting Slow When Reading / Writing Files From _ Onto Disk - Is That Normal?

Sep 27, 2010

Whenever I am busy reading or writing large files, or large sum of files, my computer is unresponsive. Screens are getting greyed-out and I just can sit there and wait until the reading/writing is done.
This is not caused by the CPU which is overstressed because it is not. Look at the attachments and you will see the CPU is used for about 20%. When these pictures were captured the computer was using hellanzb to unrar a long list of rar-files.
When you look at my signature you see the computer is not bad at all, just disk-access is slow. I can transfer files with a maximum speed of 30MB/s. Is that normal or is it very slow? I don't know the numbers. I have 2 SATA disks.
O.S. is Mint 9-Isadora, based on Ubuntu 10.04 and I use the 64-bits version.

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Ubuntu Security :: Home Folder - Reading Data Encrypted With Old Version

May 17, 2010

If I wanted to transfer a home folder that was encrypted to another ubuntu computer could I? If I had a separate home partition that was encrypted, but I wanted to upgrade ubuntu to the latest version by doing a clean install is there an easy way so that I can still read the data encrypted with the old version?

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Software :: Reading And Writing SAC (Seismic Analysis Code) Data Files In Fortran Codes

Dec 2, 2008

I synthesized a seismogram by using Fortran codes, I need plot the synthesized seismogram and the data together, so I can verify the accuracy of code. Now I encounter a question: how to read the SAC data by Fortran code, I have searched some codes on Internet, the details as follow:the velr12a.sac is my data file.

c read sac file


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Fedora Installation :: Lost All Data On Drive By Bad Clicks - Change User To Root?

Jul 21, 2009

This is my 6th install of Fedora, begining with Fedora 4 I have had very good luck with all until 9 and I lost all data on drive by my bad clicks in a frustrated session. Now I have a great install of Fedora 10 with the exception that I fouled up and typed in a user (myself-'andybill') and am finding out that the work I need to do cannot be maximized by operating in user - andybill, I need to be super user. I have just moved and have not done any collaboration with our senior partner in a data development start up that he is the intellectual property in deed and law. For me to get back on track my using this OS I have to be master of all libraries, drivers etc. I am a nu-b (only 2 1/2 years, with no computer science background. This explains why I need step by step commands without abbriviated lingo-So if I can remove myself as andybill, make all root

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Ubuntu :: Data Transfer Rates Over Usb/lan Slow?

Jul 18, 2010

I am running ubuntu 10.4 lts desktop and ubuntu 9.10 server with the gui active. On both of these machines the data transfer rates over usb and lan have slowed down quite considerably. Also over multiple devices, not the same hardware everytime I try to transfer something.

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CentOS 5 Networking :: Slow Data Transfers W/ Smb, Scp?

Apr 14, 2009

I am having a problem with slow data transfers with both Samba and scp. I have gigabit NIC's on both all three machines that I am transferring to and from, connected to a gigabit switch. My data transfers under both smb and scp average around 21 MBit/s, (I am using nload to monitor transfer speeds).The machines are configured as follows,1) desktop

AMD Athlon 64 X2 6000+
6 gig Corsair memory
Realtek RTL8168C(P) gigabit NIC (on board)


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General :: Why Is Reading A FILE Faster Than Reading A VARIABLE?

May 4, 2011

I don't understand the results of a simple performance test I ran using two basic scripts (running on a high end server):

perfVar.zsh :

#!/bin/zsh -f
MYVAR=`cat $1`
for i in {1..10}


Performance test result:

> time ./perfVar.zsh BigTextFile > /dev/null
./perfVar.zsh FE > /dev/null 6.86s user 0.32s system 100% cpu 7.177 total
> time ./perfCat.zsh BigTextFile > /dev/null
./perfCat.zsh FE > /dev/null 0.01s user 0.10s system 91% cpu 0.118 total

I would have thought that accessing a VARIABLE was way faster than reading a FILE on the file system... Why this result ?Is there a way to optimize the perfCat.zsh script by reducing the number of accesses to the file system ?

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Networking :: Received Data - RX - Errors And Very Slow Connection

Jun 22, 2010

I have a Webserver (Co-Location) and all runs fine ... since last week. Now there are a lot of RX-ERR shown in netstat and ifconfig. And when I try to upload a external website direct on the server for example via wget, it is very very slow and hangs very often.

RX packets:2919694 errors:990386 dropped:0 overruns:0 frame:596420
TX packets:4231423 errors:0 dropped:0 overruns:0 carrier:0

I have analyse the network but I was not able to find a problem. My hoster has checked the network and all looks fine. For example my hoster has plugged-in a pc in the same switch ... and was able to do wget (load external data, like websites) in normal speed.

Since last week my websites were delivered slower as before, too. It seemed there is a network-problem ... but how can I find it?

Actually I can install moduls ... but the server needs hours. So, if you knows a good command-line tool to analyse the network.

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Ubuntu :: Slow Data Transfer To External Drive In Jaunty?

Mar 26, 2010

I'm getting a really low speed (2-3 mbps) while transferring data to my USB drive and external hard drive. I've heard this problem's there in Karmic but not in Jaunty but i have Jaunty and yet I'm facing this problem.

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Ubuntu Networking :: Broadcom On 2.6.34 - Reinstall Error Code: Reading Package Lists ... Done Building Dependency Tree Reading State Information

May 20, 2010

i installed kernel 2.6.34 to fix my lid closing issue, and that went great. but now when i go to reinstall my broadcom i get this error. Code: Reading package lists... Done Building dependency tree Reading state information... Done bcmwl-kernel-source is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded. 1 not fully installed or removed. After this operation, 0B of additional disk space will be used. Setting up bcmwl-kernel-source ( ... Removing old bcmwl- DKMS files...


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Fedora :: Moving From 32-bit To 64-bit With A New Motherboard

Mar 17, 2011

I am currently running Fedora 14 on a 32-bit AMD XP motherboard. My plan is to replace the motherboard w/an AMD 64-bit (multicore, prob'ly) version (most likely w/a different h/w architecture) and I'd like to make sure my current applications and configuration (if that makes any sense) are moved en masse to the 64-bit version.

Is there an easy way to do this? What are my "gotchas"?

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Fedora Hardware :: No Ide Or Fd Interface On Motherboard?

Jun 29, 2011

I recently purchased a motherboard but overlooked that there are no ide or fd plugs on it. What I am wondering is, since the solder points are on the motherboard, can I solder some plugs on or is the controller disabled/non existent?

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Fedora :: Installing To An M3N78-EMH Motherboard

Feb 14, 2010

i want to install fedora core 2 on my lap dell inspiron 15 it shows there is no hdd i convert the bios option to ahci but the sata hdd not found

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Fedora Installation :: System Hangs On M3A78-T Motherboard?

Mar 1, 2009

I got an Asus M3A78-T motherboard last year, along with a Phenom 9650 CPU and 2GB of RAM. I originally tried to install Sabayon, but it would occasionally hang while running. I decided to give Fedora another try (wasn't happy with FC4 a few years back) at the constant chiding of my friend.

My first try was with the x86_64 Fedora 10 ISO, using an IDE hard drive and CDROM. It would hang a little bit into something like 'copying system files, at the same place every time. Thinking it was a bad burn, bad iso, or something (checksum and image verification passed) I went ahead and got the DVD ISO. The DVD would always hang a little bit into "Formatting file system." At this point, I have tried EVERY other combination of hardware - swapped out ram, CPU, PS, bought SATA hard drive and DVDROm drive, unplugged the mouse, and even the case pigtails for USB and Firewire. It always hangs in the same place. Somewhere along the process, I took the motherboard back and exchanged it for a new one. Still fails, and in exactly the same place.

The system hang is a hard lockup. Mouse freezes, no keyboard activity (even LED status changes.) The drive activity LED will go out and the progress bar stops advancing.

I'm surprised I'm not seeing anyone else with this problem - I thought this board was a bit more prevalent, but I'm guessing not! What's my next step? I would create a bug report, but I don't know what subsystem is causing the hang. I suspect SATA drivers, but I'm not sure how to test that.

And one other clue - I get a scrambled video screen before it comes up to the first X install screen:

It only lasts for 5 seconds or so, then comes up okay.

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Fedora :: UUID Format Of Drives Changed With New Motherboard?

Mar 11, 2010

I am trying to recover some data on some drives that are in the same LVM. When I upgraded the motherboard, I had complications getting the drives to all load under the LVM, and in the process I made the mistake of formatting one of the drives. The problem now is that the UUID changed on the drive so when I try to mount the LVM it can't find device with a certain UUID. When I try to set the UUID back to the old one it says 'Invalid UUID format'.

I can set it to a UUID generated through 'uuidgen', si I then noticed that the format of that UUID is different than the old one which I'm trying to set it to. Why is that? Is there a way I can get it to change to the old one in the different format?
The old format: yQtrVB-5jCk-vF10-05c2-AcDL-GNn1-ivdxxh
The new format: d5224587-a6cd-4a66-a12b-d7b75eec5871

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Hardware :: No Sound With Motherboard Asus M4A78T-E For Fedora 13?

Jun 25, 2010

no sound with motherboard Asus M4A78T-E for fedora 13

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Fedora X86/64bit :: Unable To Install 64 Bit Packages For ASUS Motherboard / Fix It?

Dec 24, 2009

I have driver DVD for ASUS motherboard. This DVD has drivers (motherboard and audio) for Linux, how do I install these packages.

When I tried installing these with package installer, it says cannot install the packge.

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