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• Windows XP - removing write protection for usb drives

  - by Arnold

  I have a laptop who used to belong to my company and when I plug in a usb memory drive, I cannot write any files to it. This is because company policy did not allow writing to usb drives without a special authorization (to prevent theft of files). However the laptop is now mine, and I was given the administrator password, so I am guessing that as administrator I can remove this protection somehow. How can I do this? Currently if I try to copy a file to the drive, Windows simply tells me that the drive is write-protected, whatever usb drive I plug in. Maybe it is some registry setting? Thank you.

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• Read-only access to SSIS server

  - by Bo Schatzberg

  How do we set up a developer with read-only access to a production SSIS environment?

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• Simultaneous read/write to RAID array slows server to a crawl

  - by Jeff Leyser

  Fairly beefy NFS/SMB server (32GB RAM, 2 Xeon quad cores) with LSI MegaRAID 8888ELP controlling 12 drives configured into 3 different arrays. 5 2TB drives are grouped into a RAID 6 array. As expected, write performance to the array is slow. However, sustained, simultaneous read/write to the array (wether through NFS or done locally) seems to practically block any other access to anything else on the controller. For example, if I do: cp /home/joe/BigFile /home/joe/BigFileCopy where BigFile is 20G, then even a simple ls /home/jane will take many 10s of seconds to complete. In addition, an ls /backup will also take many tens of seconds, even though /backup is a different array on the same controller. As soon as the cp is done, everything is back to normal. cp /home/joe/BigFile /backup/BigFile does not exhibit this behavior. It's only when doing read/write to the same array.

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• VMWare Workstation can't read CD/DVD drive

  - by Chris W

  A fresh install of VMWare Workstation 7 (7.1.1 build 282343) on Windows 7 64 bit. When I try to read a CD/DVD from a guest (either to install a fresh guest or to read a CD within an existing VM I get the following error: Cannot connect virtual device ide1:0 because no corresponding device is available on the host. I've tried fiddling with the IDE channels as well as tried SCSI with no joy. What am I missing? I can run ISOs fine but I don't want to have to convert everything to an ISO when I presume that this should just work fine.

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• fstab line for auto mount drive that all users can read/write

  - by evilblender

  I have installed a cable that connects from the CPU's SATA motherboard connection to a removable drives' ESATA connection. I would like to be able to swap drives on the ESATA connection and have all users be able to read and write to these drives. I have created the directory /archive/ where I would like the drive(s) to mount. The drives are all formatted Fat 32 - but in the future I may use HFS for formatting. When I used the command (as root): mount /dev/sdc1 /archive the drive was mounted (but read only) What can I use in my /etc/fstab file that will allow drives to be mounted and unmounted by all users on the system? (both reading and writing) Also, will I be able to mount and unmount these drives without shutting down? or will I need to reboot every time I want to change drives? Thank you. Jeff

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• Brand new Seagate HDD has high raw read error rate

  - by kpax

  I've just purchased a brand new Seagate ST31000524AS 1TB HDD. Manufacture date shows as January 2012 (yes that's as new as new can get), so must be one of the new batches from the post-flood Thailand. Anyway, I downloaded a copy of Active Hard Disk Monitor tool to check the S.M.A.R.T. parameters and I find the parameter Raw Read Error Rate is very low. Should I be worried? Will this rectify over time? This hdd is just 7 hours old; what gives? Edit: I meant high raw read error rate - Title updated accordingly

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• SSH issues: Read from socket failed: Connection reset by peer

  - by nitins

  I compiled OpenSSH_6.6p1 on one of our server. I am able login via SSH to the upgraded server. But I am not able to connect to other servers running OpenSSH_6.6p1 or OpenSSH_5.8 from this. While connecting I am getting an error as below. Read from socket failed: Connection reset by peer On the destination server in the logs, I am seeing it as below. sshd: fatal: Read from socket failed: Connection reset by peer [preauth] I tried specifying the cipher_spec [ ssh -c aes128-ctr destination-server ] as mentioned in here and was able to connect. How can configure ssh to use the cipher by default? Why is the cipher required here?

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• OSX Mail.app send only plaintext but read as html

  - by bawkstoo

  I get email which seems properly plaintext formatted, but when I forward it out, the font size ends up being enormous and a few other formatting stupidities. So I tried the following: defaults write com.apple.mail PreferPlainText -bool TRUE And this works great, all outgoing email regardless of the text original is plaintext only, just the way I like it. But now for incoming email only the plaintext portions are available to read without going into View - Message - Raw Source (or something similar to that). Does anyone know how I can force only outgoing mail to include only plaintext, but continue to read incoming mail in the formatting it was intended?

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• Linux Read-Ahead Downsides

  - by JPerkSter

  Hi Everyone, Hope all is well. I have a question regarding read-ahead caching. Are there any downsides to raising the size of the read-ahead cache? On our farm, we're currently running at 256, and upon raising that higher, we are seeing significant throughput gains.   [root@server~]# hdparm -tT /dev/sda /dev/sda: Timing cached reads: 7352 MB in 2.00 seconds = 3677.62 MB/sec 3 Timing buffered disk reads: 244 MB in 3.10 seconds = 78.68 MB/sec [root@server ~]# blockdev --setra 10240 /dev/sda [root@server ~]# hdparm -tT /dev/sda /dev/sda: Timing cached reads: 11452 MB in 2.00 seconds = 5728.52 MB/sec Timing buffered disk reads: 422 MB in 3.17 seconds = 133.04 MB/sec We are running on 2.6. Thanks!

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• Ubuntu + Unable to Edit .bashrc file because of ReadOnly

  - by Napster

  To Remove Issue of WARNING: Unable to verify SSL certificate for api.heroku.com To disable SSL verification, run with HEROKU_SSL_VERIFY=disable By Googling I got few solution. One of them is added HEROKU_SSL_VERIFY=disable to .bashrc. Unfortunately, I am not able to edit that file, gives an error of 'readonly' option is set (add ! to override) !wq is used in place of :wq, but no response. Please suggest me to resolve this issue... Thanks

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• HFS partition mounting read-only

  - by Sid

  Hey, I have an external Western Digital Hard drive with two HFS partitions with journaling disabled. When I connect it to a computer running Linux (Debian or Ubuntu), frequently both partitions are mounted read-only. In the past, mounting them on my Macbook and executing the command to disable the journaling often worked (even though it would tell me that journaling was already disabled) but I would love to have a solution which works every time. Thanks! Edit: In light of Chris Johnsen's comment below - my question is how to mount the filesystem read+write on Linux since it is not automatically doing so itself

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• How to read a .pages file on a PC

  - by Phenom

  I made a document on my Macbook Pro and it's extension is .pages Is there a program for Windows that can read this document?

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• Sudden slow read & write speed on all IO

  - by user23392

  I have a custom built rig that has 2 storage drives. for OS: Western Digital 1.0TB HARD DR 64MB for other stuff: Corsair Performance 3 128GB (SSD) [ expected read speed: 400 mb/s ] The system was incredibly fast for a couple of months, then one day i was playing a game then it started to get buggy (some sounds and objects disappearing), i stopped the game and the system seemed to be unstable so i had to shut it down, next morning i couldn't start it up, it was saying something about corrupt device. I formatted both disks and installed a fresh copy of windows, all i can say that since that day the system was never like before, it takes 10 minutes to boot up (the icons and desktop slowly appear). but once it's done the slowness isn't as noticeable. Here's my benchmark on the HDD ( read speed - write speed ): And the SSD: Anyone knows what could be the issue?

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• Re-format thumb drive

  - by wizlog

  I was trying to put the Windows 8 Consumer Preview onto a thumb drive, when I was asked if I was OK with wiping it (I said yes I as it was blank). I had to sleep my computer during the wiping, and now I can't do anything with my dive. When I put it into my computer: When I click format disk: In short, the disk never reformats (I get an error message letting me know that Windows was unable to format the drive). Whats going on, and how do I fix it?

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• Apache logs other user read permissions

  - by user2344668

  We have several developers who maintain the system and I want them to easily read the log files in /var/log/httpd without needing root access. I set the read permission for 'other' users but when I run tail on the log files I get permission denied: [root@ourserver httpd]# chmod -R go+r /var/log/httpd [root@ourserver httpd]# ls -la drwxr--r-- 13 root root 4096 Oct 25 03:31 . drwxr-xr-x. 6 root root 4096 Oct 20 03:24 .. drwxr-xr-x 2 root root 4096 Oct 20 03:24 oursite.com drwxr-xr-x 2 root root 4096 Oct 20 03:24 oursite2.com -rw-r--r-- 1 root root 0 May 7 03:46 access_log -rw-r--r-- 1 root root 3446 Oct 24 22:05 error_log [me@ourserver ~]$ tail -f /var/log/httpd/oursite.com/error.log tail: cannot open `/var/log/httpd/oursite/error.log' for reading: Permission denied Maybe I'm missing something on how permissions work but I'm not finding any easy answers on it.

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• Serial port : Read data problem, not reading complete data

  - by Anuj Mehta

  Hi 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++ App Open the connection to serial port serialfd = open( serialPortName.c_str(), O_RDWR | O_NOCTTY | O_NDELAY); if (serialfd == -1) { /* * Could not open the port. */ TRACE << "Unable to open port: " << serialPortName << endl; } else { TRACE << "Connected to serial port: " << serialPortName << endl; fcntl(serialfd, F_SETFL, 0); } Configure the Serial Port parameters struct termios options; /* * Get the current options for the port... */ tcgetattr(serialfd, &options); /* * Set the baud rates to 9600... */ cfsetispeed(&options, B38400); cfsetospeed(&options, B38400); /* * 8N1 * Data bits - 8 * Parity - None * Stop bits - 1 */ options.c_cflag &= ~PARENB; options.c_cflag &= ~CSTOPB; options.c_cflag &= ~CSIZE; options.c_cflag |= CS8; /* * Enable hardware flow control */ options.c_cflag |= CRTSCTS; /* * Enable the receiver and set local mode... */ options.c_cflag |= (CLOCAL | CREAD); // Flush the earlier data tcflush(serialfd, TCIFLUSH); /* * Set the new options for the port... */ tcsetattr(serialfd, TCSANOW, &options); Now I am reading data const int MAXDATASIZE = 512; std::vector<char> m_vRequestBuf; char buffer[MAXDATASIZE]; int totalBytes = 0; fcntl(serialfd, F_SETFL, FNDELAY); while(1) { bytesRead = read(serialfd, &buffer, MAXDATASIZE); if(bytesRead == -1) { //Sleep for some time and read again usleep(900000); } else { totalBytes += bytesRead; //Add data read to vector for(int i =0; i < bytesRead; i++) { m_vRequestBuf.push_back(buffer[i]); } int newBytesRead = 0; //Now keep trying to read more data while(newBytesRead != -1) { //clear contents of buffer memset((void*)&buffer, 0, sizeof(char) * MAXDATASIZE); newBytesRead = read(serialfd, &buffer, MAXDATASIZE); totalBytes += newBytesRead; for(int j = 0; j < newBytesRead; j++) { m_vRequestBuf.push_back(buffer[j]); } }//inner while break; } //while

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• Reading from serial port with Boost Asio?

  - by trikri

  Hi! I'm going to check for incoming messages (data packages) on the serial port, using Boost Asio. Each message will start with a header that is one byte long, and will specify which type of the message has been sent. Each different type of message has an own length. The function I'm about to write should check for new incoming messages continually, and when it finds one it should read it, and then some other function should parse it. I thought that the code might look something like this: void check_for_incoming_messages() { boost::asio::streambuf response; boost::system::error_code error; std::string s1, s2; if (boost::asio::read(port, response, boost::asio::transfer_at_least(0), error)) { s1 = streambuf_to_string(response); int msg_code = s1[0]; if (msg_code < 0 || msg_code >= NUM_MESSAGES) { // Handle error, invalid message header } if (boost::asio::read(port, response, boost::asio::transfer_at_least(message_lengths[msg_code]-s1.length()), error)) { s2 = streambuf_to_string(response); // Handle the content of s1 and s2 } else if (error != boost::asio::error::eof) { throw boost::system::system_error(error); } } else if (error != boost::asio::error::eof) { throw boost::system::system_error(error); } } Is boost::asio::streambuf is the right thing to use? And how do I extract the data from it so I can parse the message? I also want to know if I need to have a separate thread which only calls this function, so that it get called more often? Isn't there a risk for loosing data in between two calls to the function otherwise, because so much data comes in that it can't be stored in the serial ports memory? I'm using Qt as a widget toolkit and I don't really know how long time it needs to process all it's events.

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• Writing/Reading struct w/ dynamic array through pipe in C

  - by anrui

  I have a struct with a dynamic array inside of it: struct mystruct{ int count; int *arr; }mystruct_t; and I want to pass this struct down a pipe in C and around a ring of processes. When I alter the value of count in each process, it is changed correctly. My problem is with the dynamic array. I am allocating the array as such: mystruct_t x; x.arr = malloc( howManyItemsDoINeedToStore * sizeof( int ) ); Each process should read from the pipe, do something to that array, and then write it to another pipe. The ring is set up correctly; there's no problem there. My problem is that all of the processes, except the first one, are not getting a correct copy of the array. I initialize all of the values to, say, 10 in the first process; however, they all show up as 0 in the subsequent ones. for( j = 0; j < howManyItemsDoINeedToStore; j++ ){ x.arr[j] = 10; } Initally: 10 10 10 10 10 After Proc 1: 9 10 10 10 15 After Proc 2: 0 0 0 0 0 After Proc 3: 0 0 0 0 0 After Proc 4: 0 0 0 0 0 After Proc 5: 0 0 0 0 0 After Proc 1: 9 10 10 10 15 After Proc 2: 0 0 0 0 0 After Proc 3: 0 0 0 0 0 After Proc 4: 0 0 0 0 0 After Proc 5: 0 0 0 0 0 Now, if I alter my code to, say, struct mystruct{ int count; int arr[10]; }mystruct_t; everything is passed correctly down the pipe, no problem. I am using READ and WRITE, in C: write( STDOUT_FILENO, &x, sizeof( mystruct_t ) ); read( STDIN_FILENO, &x, sizeof( mystruct_t ) ); Any help would be appreciated. Thanks in advance!

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• Use icacls to make a directory read-only on Windows 7

  - by Dave G

  I'm attempting to test some filesystem exceptions in a Java based application. I need to find a way to create a directory that is located under %TMP% that is set to read-only. Essentially on UNIX/POSIX platforms, I can do a chmod -w and get this effect. Under Windows 7/NTFS this is of course a different story. I'm running into multiple issues on this. My user has "administrative" right (although this may not always be the case) and as such the directory is created with an ACL including: NT AUTHORITY\SYSTEM BUILTIN\Administrators <my current user> Is there a way using icacls to essentially get this directory into a state where it is read-only PERIOD, do my test, then restore the ACL for removal? EDIT With the information provided by @Ansgar Wiechers I was able to come up with a solution. I used the following: icacls dirname /deny %username%:(WD) In the page located here I found this in the remarks section: icacls preserves the canonical order of ACE entries as: * Explicit denials * Explicit grants * Inherited denials * Inherited grants By performing the above icalcs command, I was able to set the current user's ability to write or append files (WD) to the directory to deny. Then it was a question of returning it to a state post test: icacls dirname /reset /t /c Done

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• "A disk read error occurred" when booting XP disk image in VirtualBox

  - by intuited

  I'm trying to boot an XP installation cloned into VirtualBox from a real drive. I'm getting the message A disk read error occurred Press Ctrl+Alt+Del to restart whenever* I try to boot the machine. * This is not strictly true: with AMD-V enabled, the boot process appears to not make it this far and instead hangs at a black screen with cursor. I created the VirtualBox image from the original drive using the following method: $ sudo ddrescue -n /dev/sdd sdd.img logfile # completed without errors $ VBoxManage convertfromraw sdd.img disk.vdi The original disk (and the image) contain a single NTFS partition with XP installed on it. The owner of the drive indicates that it did boot okay the last time the system made it that far. The (Pentium 4) system has a broken (enormous) heat sink, so at some point it failed to boot because it would quickly overheat and shut down. If I boot the VM from a live cd, I am able to mount its /dev/sda1 without any problems. I ran ntfsfix and didn't have any luck. I've read through the instructions on doing this. I didn't really follow them. For example, I didn't run MergeIDE before imaging because the machine was not bootable. However, the symptom of that problem seems to be quite different. The emitted message is contained in the volume boot record of the XP partition, which leads me to suspect that this is a problem with the core operating system bootstrap procedure, and not related to anything in the registry. I don't have an XP boot CD.

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• Apache to read from /home/user/public_html on CentOS 5.7

  - by C.S.Putra

  this is my first experience using CentOS 5.7 / Linux as my web server OS and I have just finished installing Apache. Then I created a new account using WHM. The account is now created and the domain name can be accessed. I have put the web files under /home/user/public_html/ but when I access the domain assigned for that user which I assigned when creating new account in WHM, it doesn't read the files. In /usr/local/apache/conf/httpd.conf : <VirtualHost 175.103.48.66:80> ServerName domain.com ServerAlias www.domain.com DocumentRoot /home/user/public_html ServerAdmin [email protected] User veevou # Needed for Cpanel::ApacheConf <IfModule mod_suphp.c> suPHP_UserGroup group1 group1 </IfModule> <IfModule !mod_disable_suexec.c> SuexecUserGroup group1 group1 </IfModule> CustomLog /usr/local/apache/domlogs/domain.com-bytes_log "%{%s}t %I .\n%{%s}t %O ." CustomLog /usr/local/apache/domlogs/domain.com combined ScriptAlias /cgi-bin/ /home/user/public_html/cgi-bin/ </VirtualHost> Instead of reading from /home/user/public_html/ apache will read the /var/ww/html/ folder. How to set the apache so that when user access www.domain.com, they will access the files under /home/user/public_html/ ? Please advice. Thanks

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• Toshiba laptop cd drive read causes OS to totally freeze

  - by Fujishiro

  Okay I'll try to write an understandable summary. Forgive me if I'll fail with that attempt though. So. There is a Toshiba Satellite notebook. Got Windows 7 x86 Professional (OEM) installed on it, everything is fine (okay.. somewhat). The problem. If you put an audio or any kind of disc into the drive, something starts to eat the PC. Back then when the owner told me about this, he put an audio disc into the lappy. Winamp caused the IO load, 100%. Tried taskkill, taskkill /T, tried powershell, EVERYTHING. You just can NOT kill winamp or anything which becomes the blocker at that time. Even if you kill almost everything, laptop won't do a clear shutdown. Also I tried to use the force switch at 'shutdown' from cmd, but no use. (So: At these times you can use the laptop, but the blocker/explorer/disc becomes gray as a non-responding app. You can try to kill them, but that won't work, nor you can shutdown the machine). (Also tried using PID, but no use. For the highest IO I used the "select columns" from Task Manager and enabled the IO columns.) My first hunch was the problematic disc, autoplay and it tries to read tries to read (still shouldn't kill the PC). Disabled autoplay, removed winamp. Tried other software, etc. Everything was ok. Few days later the owner tried to put a disc into the machine and it started to reproduce the same symptoms but with a totally different disc. Uhm what to know. Virus is not an option, protected by BitDefender (valid license) and Spybot. Thanks if you have ANY idea about this strange problem. ps.: For now, the owner uses Daemon tools + Blindwrite as an alternative for those apps which wouldnt start without the disc.

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• needing storage integrity (write/read) test - for BASH

  - by Mr. Bash

  In need of shell scripts / bash commands to verify data integrity of local harddrives, usb-drives, etc, ... Like the famous www.heise.de/download/h2testw; or something that is at least common within repositories. (h2testw writes a specific datastring over and over onto the medium, then reads it again to verify if it was written correctly and displays write/read time/speed.) please no dd if=/dev/random of=/dev/sdx bs=1k && dd if=/dev/sdx of=/dev/null bs=1k since it won't verify if everything was written correctly. It is only a test if read/write is successful to the device. So far, I'm not too happy with badblocks -w -v /dev/sdx1 either, since it seems rather slow and I don't know what it exactly writes, and if it considers wear-leveling on flash media. There is also a program named F3 http://oss.digirati.com.br/f3/ that needs to be compiled. Designed after h2testw, the concept sounds interesting, i'd just rather have it as a ready to go bash script.

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• How to use Python to read the physical address(MAC ID) [closed]

  - by getjoefree

  I want to read the physical address of the NIC model, i can get the results that i want to with SED.EXE before, but SED.EXE does not support my environment but Python ok, who have the means to do it. The general situation (not plug the network cable, it is impossible to obtain IP address): Ethernet adapter: Connection-specific DNS Suffix.: Chianet Description ...........: Marvell Yukon 88E8040 PCI-E Fast Ethernet Controller Physical Address .........: A4-BA-DB-9D-1E-8E Dhcp Enabled ...........: Yes Autoconfiguration Enabled ....: Yes Ethernet adapter 3: Media State . . . . . . . . . . . : Media disconnected Description . . . . . . . . . . . : Dell Wireless 1510 Wireless-N WLAN Mini-Card Physical Address. . . . . . . . . : 00-23-4D-D9-C0-28 The description of the NIC different, we can use this to fetch the corresponding physical address, base on Physical Address does not work, because the computer with the WLAN Card, I want to use Python to read my computer the card information and after Python handles an output file, output file format: SET MAC = A4BADB9D1E8E and sed format: ipconfig -all|sed -nrf getmac.sed | sed -e "s/-//g" > WINMAC.BAT getmac.sed: /Marvell Yukon 88E8040/ { n; s/.*: ([-0-9A-F]+)/set winmac=\1/p; }

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• Refresh file access time under Linux / Discard disk read cache

  - by calandoa

  I am making use of the access time to analyse some build process, but it is not working the way I want: the access time is updated the first time I read the file, then it stays the same for a long while, or until the next reboot. For instance: $ ll -u some_file -rw-r--r-- 1 root root 1.3M 2010-04-07 10:03 some_file $ grep abcdef some_file $ ll -u some_file -rw-r--r-- 1 root root 1.3M 2010-04-07 11:24 some_file # The access time is updated # waiting a few minutes... $ grep abcdef some_file $ ll -u some_file -rw-r--r-- 1 root root 1.3M 2010-04-07 11:24 some_file # The access time has not been updated :( I suppose that the file is buffered by Linux in the free memory, the only this copy is accessed the subsequent times for speed reasons. A solution would be to discard the buffers in memory. After searching some forums, I found: sync echo 1 > /proc/sys/vm/drop_caches echo 2 > /proc/sys/vm/drop_caches echo 3 > /proc/sys/vm/drop_caches But it is not working, it seems that it only sync up the write buffers, not the read ones. May be it is due to some custom kernel configuration on my distro (fedora 9)? Or I am missing something here? Is there a way to achieve this access time refresh? Note also that I do not want to simulate some writes on my entire file tree. Because I am using some makefile based build system, this will cause the entire project to be build again.

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