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  • Why is my /dev/random so slow when using dd?

    - by Mikey
    I am trying to semi-securely erase a bunch of hard drives. The following is working at 20-50Mb/s dd if=/dev/zero of=/dev/sda But dd if=/dev/random of=/dev/sda seems not to work. Also when I type dd if=/dev/random of=stdout It only gives me a few bytes regardless of what I pass it for bs= and count= Am I using /dev/random wrong? What other info should I look for to move this troubleshooting forward? Is there some other way to do this with a script or something like makeMyLifeEasy | dd if=stdin of=/dev/sda Or something like that...

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  • Windows 8 "ate" 100GB of my SSD

    - by Eleeist
    Yesterday I've done a completely fresh Windows 8 Pro install on brand new Samsung SSD. I recall that just after the installation Windows was taking about 10GB. I've installed all the updates and when today I entered My Computer I've almost got a heart attack: disk C: 12.3 GB free of 118 GB! The file explorer, when I enter the disk highlight everything and go to Properties, tells me that the files in there take only 22.5 GB of space which seems reasonable. So where is my 100 GB?

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  • usb flash drives how to fix ?

    - by madyotto
    Hi all I have recently purchased some so called 256gb Kingston drives that are fake I used a program called check flash and few other to check for dead sectors and read speed and read and write speed the results are as follows: they were reading at 1.35 mbps at best they read and wrote at 0.95 mbps and had a hell of a lot of dead sectors so what I ask is: Is there a way to drop the size to improve speed Is there any other way to improve speed How can I stop the device from addressing the dead sectors Any help will be much appreciated ALL THE THANKS (MADYOTTO)

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  • Truecrypt rescue usb

    - by geekbutitsokk
    i have found tutorials on their official forum and on the internet about how to make a truecrypt rescue bootable usb stick. I'm guessing anyone who can answer will know what that is already, but it is basically just a way to boot into the system using a usb stick instead of a DVD. But the only problem is all of these tutorials involve using Grub4Dos, and i cannot run Grub4Dos on 64 bit windows 7. Is there any other alternative method? Thanks!

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  • External HDD connecting via USB disconnects wireless LAN connection

    - by Kensai
    Strange problem. I have this MEDION Akoya PC that has a dedicated bay to slide an external HDD sold separately. It's very handy indeed cause the slot is providing a fast USB 3 connection and power to the HDD unit, without extra cables. All works fine except this show-stopper behavior to disconnect me from the router once I slide in the unit and it powers up. The moment I connect the unit the (normally) three-four WiFi connections I see in my neighborhood disappear and my own to the router loses its signal strength (no Internet traffic is possible). After a while it throws me off that one as well, never to connect me again as long as the unit is powered. Once I disconnect the HDD the various signals come back and it automatically reconnects to my own. What takes? Are we in front of a serious design fault by MEDION here? Does the spinning of the HDD on top of the PC cause electromagnetic interference strong enough to throw off my WiFi connectivity? Is it a simple USB problem? Some kind of strange hardware conflict? Where should I look?

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  • How to fix windows 7 boot process

    - by MasterCorban
    Ok so i used xp for years before i was able to get my hands on the Windows7 RC which i bought a new HDD for, and then followed the process to dual-boot. About a month ago xp started acting funny and i thought the disk might be dying. So i started using Windows7 all the time. Today i start the computer and it cant find the disk which xp was on anymore. I guess its dead. So i remove the xp HD and my computer cant start...insert bootable disk or something similar So how can i remove the primary(dead) xp disk and boot straight to Windows 7?

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  • How to format pendrive from fat32 to ext3 in windows7

    - by newb
    I am trying to make a live usb of OPHCRACK and tried to boot from FAT32 pendrive. But after making live usb and boot from it the ophcrack didnt work. After searching a while i came to understand that ophcrack will not work in a fat32 pendrive and we have to convert it into ext3. But i am getting hard time finding a method or software which can be used to convert fat32 pendrive to ext3 in windows 7. Can you suggest any method or software's for this purpose

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  • where is my disk space?

    - by user166241
    I recently had a problem with .xsession-errors file - it became very big ( 90GB) and took all disk space: How I can check what takes disk space in /tmp?. I cleaned it with command > .xsession-errors but after an hour it became large again. So I deleted it (rm .xsession-errors) - it helped because it wasn't recreated but again after hour disk space disappeared - now there is no .xsession-errors anymore but I don't know where is the memory: df Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda1 106640456 101223392 4 100% / udev 8166744 8 8166736 1% /dev tmpfs 3270224 972 3269252 1% /run none 5120 0 5120 0% /run/lock none 8175552 152 8175400 1% /run/shm du -sc * .[^.]* | sort -n 0 initrd.img 0 initrd.img.old 0 proc 0 sys 0 vmlinuz 0 vmlinuz.old 4 cdrom 4 lib64 4 media 4 mnt 4 selinux 8 dev 12 srv 16 lost+found 68 tmp 1124 run 3396 lib32 5164 .rpmdb 5540 root 8888 sbin 9120 bin 17132 etc 106080 opt 116956 boot 861908 lib 3530584 usr 3821836 var 13371260 home 21859112 total So there is around 100GB used but executing du -sc * .[^.]* | sort -n in root directory finds only ~21 GB - so what takes 80GB?? How to check it? I suspect that when I deleted the `.xsession-errors' file the errors were redirected somwhere else - but where?

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  • random hard disk errors

    - by AugB
    For the past 2 years or so (4 year old custom build) I've been getting random moments where everything stops responding (or takes a very long time to respond) followed by I/O and hdd not detected errors on restart. To fix it, all I usually need to do is unplug my SATA cables from the hdd and mobo and plug them back in again and the problem disappears, at least for a little while (it ranges anywhere from a day to a few months time). Sometimes even a startup repair does the job. I've done multiple reformats and have also ran chkdsk more times than I can remember and both do not seem to help in the long run. Both the drives seem to be exhibiting the same problem. Have both my hdds been "dying" for the past couple of years, even though they are fully functional besides these occasional hiccups? Does the issue lie elsewhere? All feedback is appreciated. System specs: Biostar Tpower i45 mobo 2x WD Caviar 640GB hdds Zalman 750w psu Radeon 5870 gpu 2x2gb Gskill DDR2 ram Win7 64

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  • Do not get 'Safely remove' option in Tray for USB storage devices.

    - by blitzkriegz
    I had done some tweaks in service settings (Disabled some as I thought it is not needed). Now, I am not getting the option to safely remove mass storage device when I click the icon on the system tray. I tried enabling some of the services, but it didn't help. Moreover I'm not very sure if this anomaly is because of my changes in services. Any idea how to make those 'safely remove' options appear when I click the USB icon on the tray. Right now nothing is happening when I click.

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  • Disk (EXT4) suddenly empty without any sign of why

    - by Ohnomydisk
    I have a Ubuntu 10.04 server with several disks in it. The disks are setup with a union filesystem, which presents them all as one logical /home. A few days ago, one of the disks appears to have suddenly 'become empty', for lack of better explanation. The amount of data on the /home mount almost halved within minutes - the disk appears to have had just over 400 GB of data prior to 'becoming empty'. I have absolutely no idea what happened. I was not using the server at the other time, but there are half a dozen other users who may have been (without root access and without the ability to hose a whole disk). I've ran SMART tests on the disk and it comes back clean. The filesystem checks fine (it has 12 GB used now, as some user software continued downloading after the incident). All I know is that around around midnight on October 19, the disk usage changed dramatically: The data points are every 15 minutes, and the full loss occured between captures: 2012-10-18 23:58:03.399647 - has 953.97/2059.07 GB [46.33 percent] 2012-10-19 00:13:15.909010 - has 515.18/2059.07 GB [25.02 percent] Other than that, I have not much to go off :-( I know that: There's nothing interesting in log files at that time Nobody appeared to be logged in via SSH at the time it occured (most users do not even use SSH) The server was online through whatever occured (3 months uptime) None of the other disks were affected and everything else on the server looks completely normal I have tried using "extundelete" on the disk and it didn't really find anything (some temporary files, but they looked new anyway) I am completely at a loss to what could have caused this. I was initially thinking maybe root escalation exploit, but even if someone did maliciously "rm" the disk contents, it would take more than 15 minutes for 400 GB?

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  • I suspect that my HDD is causing hardlocks, as all other components have been replaced. How can I check this theory and solve the potential cause?

    - by user867814
    I have had this problem over quite a while now, thorough multiple Linux kernel versions and distributions, as well as replacement of all components, aside from my main HDD - RAM, GPU(twice), mother board, CPU, power supply. What happens is, at one point during the operation of the PC, it will hardlock - everything stops working, external HDD is not shut down correctly and continues to spin until I plug it out and in, there are no system/kernel logs of any kind, and no otherwise nothing that would suggest a cause. Another reason for my suspicion is that the failures happen almost exclusively during HDD read/write activity - shutdown(happens nearly 1/3 of the time so far, it's only been few days though), launching programs, and once during operation of apt. I hope the post is descriptive enough, if you need any additional info, ask(and tell me how to prepare/obtain it), and I will provide. If I'm wrong, point me in the right direction. Thanks in advance.

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  • USB Permission - Write protection

    - by dekhadmai
    I have an external harddisk and my friends asked for it. The point is I don't trust in his anti-virus software. Is there anyway to allow some folders (I prepare hdd space for him) to write-able and all others is read-only ? or is there a software that can do like this ? And it would be great if I can have full access on my computer ONLY (may be with some specific software on my PC) and without having to modify anything. I don't ask for hdd-encryption since I only want to limit the area of write-able folder (and allow my friend to read through all my data), later I can scan for virus myself only in that area ... scanning entire hdd with 500gb/friend is not fun at all ! Sorry if this doesn't seems like the programming questions. Any help would be appreciate, Thank you.

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  • Setting thresholds via smartd.conf

    - by JPerkSter
    Hello! We currently use smartd to monitor SMART health on our disks. I would like to set the 'thresholds' that smartd uses to report. For example: 197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 9 198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 9 I would like to be able to set a threshold for these two attributes to only report if they are above 10. I haven't been able to find a way to set this via smartd.conf, and I'm also not looking to actually shutdown the daemon. Has anyone ever tried this, or know how I might be able to accomplish this better then throwing a script into cron.hourly?

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  • Which would be more reliable for data archival - SD card or a generic USB thumbdrive?

    - by Visitor
    I've been thinking lately what should I preferably use for data storage and archival. I will say in advance that I do not use flash memory as the only storage media - I also keep my data on the hard drives and optical disks - flash memory is but one of the several backup solutions that duplicate each other. For the flash memory however I do have a choice - to use a generic USB thumbdrive or a SD card. Are there any indications that SD cards may be better and more reliable? From browsing people's review on the web I see that many complaints about USB sticks have to do with them completely failing, losing file system and stop being recognized by the OS. At the same time, most of the complaints for SD cards deal with just write speeds not holding up to the promise - failure reports are but a portions of those for the USB sticks. Are SD cards indeed more reliable? Am I also correct in my assumptions that SD cards use higher grade NAND chips than USB thumbdrives? At least, for class 10 cards, because the specification dictates the minimum performance and the manufacturers have to preselect better chips. While it is common for USB sticks to promise high speeds "up to XX MB/sec" but the reality is they very often deliver speeds 2-3 times less than promised. Do SD cards get better NAND chips and USB thumbdrives receive the discarded chips? Any thoughts would be appreciated.

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  • Is there a way to read the contents of the master boot record?

    - by Codezilla
    Reading another question on here it made me curious if it's possible to actually read the contents of the mbr. As I understand it, there's a certain area at the very front of the partition that lists this information. I'm curious if it's sort of like an ini file or some sort of script that runs and tells the computer what it needs to know about where to boot from and other information like sectors, heads, cylinders that's important. I don't know much about what would be in it, but I thought it'd be interesting to learn more about the specifics.

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  • Setup for NEW HDD?

    - by Ed Markey
    Building my FIRST computer. Will start with at least - one HDD, I purchased a WD SATA HDD a 10,000RPM VelociRaptor 500GB. I have read that if you use one of the settings, can't remember what it's called, that it would make an HDD rund at IDE speeds??? Could I or should I run it in RAID instead? Is RAID only for more than one HDD/ssd? I would like to get like a 64GB SSD later to maybe speed things up working together. Thanks

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  • How can I find which logon script is being run?

    - by user2517266
    I'm having an issue with network drives. Suddenly some computers and users aren't getting their mapped network drives from the logon script. I am NOT a domain admin, I don't have permission to login to the domain controller. And I know very little about Active Directory. The issue seems random, some users this day, different users tomorrow. Some computers run fine and some won't map no matter who logs in. They are mixed OS's XP (SP3), Vista, and 7. I was looking at the domain in windows explorer and I have found the batch file(s) that maps the drives in several locations, how do I know which one is actually being ran? The .bat file is located in \DOMAIN\NETLOGON\script.bat and \DOMAIN\SYSVOL\DOMAIN\scripts\script.bat and \DOMAIN\SYSVOL\DOMAIN\policies\GUID(Right? It's a crazy string)\User\Scripts\Logon\script.bat So, how can I figure out which one is actually being ran per computer or user? Cause they are all slightly different from each other and one of them doesn't map properly. Do all the files in NETLOGON get ran? Cause there are 15+ files in there. Or is it specified in Group Policy which one(s) get ran? EDIT: I am able to access a program called Active Directory Users and Computers, but the properties tab for any user is blank for the logon script.

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  • Tool to test HDD for health?

    - by Ognjen
    I've had my HDD replaced, and now my computer is freezing every 1 to 5 minutes for 5 to 10 seconds. Actually, only active applications freeze (but it can be ANY application), usually when I click something, but sometimes by themselves. How can I check if this is HDD issue or software issue? I don't want to send my laptop for second HDD replacement right away, since the last service took 40 days, so I am looking for a tool that could confirm that this is a HDD issue.

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