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  • Plugging in USB flash drive only shows error 43, "Unknown device"

    - by Daren
    My friend saved by his works onto my flash drive which was detectable/openable, but ... The very next day, the drive wouldn't show up in My Computer and Windows gave him error code 43 (Unknown device). I tried others few systems that once detected his flash drive but the problem still persisted. I don't know whether or not his flash drive is damaged but when plug/un-plugging, there are still sounds coming out though. Tried solutions: On Vista Home Premium (his computer): Uninstalled -- Restarted computer -- Re-installed (ERROR 43) On Windows 7 (my computer): Uninstalled -- Restarted computer -- Can't install (ERROR 43) It seems that my computer (Windows 7) had the lastest drivers already but still can't detect it. Its a Kingston DataTraveller 101 (DT101) 8GB. Could unplugging the flash drive without clicking "Safely Remove Hardware" have caused the problem?

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  • Why is gcc failing with "unrecognized command line option "-L/lusr/opt/mpfr-2.4.2/lib" "?

    - by Mike
    My sysadmin recently installed a new version of GCC, in /lusr/opt/gcc-4.4.3. I tested it as follows: mike@canon:~$ cat test.c int main(){ return 0; } mike@canon:~$ gcc test.c /lusr/opt/gcc-4.4.3/libexec/gcc/i686-pc-linux-gnu/4.4.3/cc1: error while loading shared libraries: libmpfr.so.1: cannot open shared object file: No such file or directory After informing my sysadmin about this, he said to add /lusr/opt/mpfr-2.4.2/lib:/lusr/opt/gmp-4.3.2/lib to my LD_LIBRARY_PATH. After doing this, I get the following error: mike@canon:~$ gcc test.c cc1: error: unrecognized command line option "-L/lusr/opt/mpfr-2.4.2/lib" First, my sysadmin wasn't entirely sure this was the best workaround(though he did say it worked for him...), so is there a better solution? Second, why am I getting a linker error from cc, and how can I fix it? Some information which may be helpful: mike@canon:~$ env | grep mpfr OLDPWD=/lusr/opt/mpfr-2.4.2/lib LD_LIBRARY_PATH=/lusr/opt/mpfr-2.4.2/lib:/lusr/opt/gmp-4.3.2/lib: mike@canon:~$ echo $LDFLAGS (the above is a blank line)

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  • Arch Linux drops me on my school network.

    - by Kravlin
    I'm running a Lenovo X61 which i carry around my college for getting on the internet at various points in the day. The network has always been finicky but recently it's gotten worse. I'll connect using iwconfig, get an ip from dhcpcd and log in using vpnc to their system. Sometimes I'll stay connected for hours but most of the time within 30 seconds my network traffic will drop to zero and i'll be unable to do anything. My computer still belives it's connected, however to try again i need to put my wireless interface down, put it back up and try again. It's gotten so bad that i've got a window on my computer pinging yahoo or google constantly in order to know if i'm still able to get online. I know other people who have used Arch Linux that don't have the same problems as well as people who use Ubuntu who haven't had any problems either. It seems like my computer is a special case. Does anyone have any suggestions on how to fix it? dmesg doesn't show anything out of the ordinary going on and i don't know where else to look for errors or other things to try.

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  • How to connect a Bluetooth network connection using the command line

    - by edg
    I can enable a Local Area Network interface for my machine with the command netsh interface set interface "Local Area Connection" ENABLED Is there an equivalent command to connect a bluetooth network connection? I've tried netsh interface set interface "Bluetooth" ENABLED but it seems to have no effect, the connection remains disconnected. I also tried netsh interface set interface "Bluetooth" connect=CONNECTED but this returns One or more essential parameters not specified

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  • Default Screensaver on Mac OS X

    - by DanieL
    Hi, How do I change the default screensaver in Mac OS X using shell. I am writing a script to customize computers that I need to distribute. In particular I would like them all to have the same default screensaver. How could I change this in a script? So far I have done the following: I have a com.apple.screensaver.default.plist file with the screensaver settings I want in it, and in the script I copy it to /Users/guest/Library/Preferences/ByHost/com.apple.screensaver.${UUID}.plist where UUID is the relevant value. I have modified /System/Library/Frameworks/Screensaver.framework/Versions/A/Resources/EngineDefaults.plist to have the screensaver I want as the default settings. But when I open Screensaver settings in System Preferences after running the script, the default screensaver is Flurry! What can I do to make this work? Thanks, ChilisWorld

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  • Textmate quick one

    - by Pickledegg
    I know its not strictly programming related, but the textmate mailing list is too 1990 for me to use properly. I won't make a habit of this: Anyone seen this popup before, it happens everytime I boot my mac. If so how do I kill it? Thanks.

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  • Change Acer Aspire one D250 resolution

    - by Siim K
    Hi, Is there any way to choose something other than than 1024x600 or 800x600 resolution on a Acer Aspire One D250 netbook (Windows 7 Starter). A program we use needs at least 1024x768 but it's not available under Screen resolution (some UI elements of said program are otherwise hidden "below" the visible screenspace and unfortunately the app window is not resizable) On a D250 with Windows XP it was possible to go to Advanced settins - Monitor and uncheck "Hide modes that this monitor cannot display". Then I was able to select the desired resolution and scroll up and down the screen with the mouse. In Windows 7 this "Hide modes..." checkbox is gray and not clickable :( Thanks

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  • How would I reset a usb hub multiplier driver?

    - by Cameron
    I have a usb port which connects a little man usb hub I got for Christmas. It worked fine to begin with however now it works on any computer other than my own. When I plug the man in it lights up and when I plug things into the man it says they have malfunctioned but when I plug them straight into tha port it's fine. Is there somesort of driver that needs to be refreshed? I have no idea how these work so please explain! I use windows 7 32bit.

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  • Resizing pages in Adobe Acrobat Pro

    - by KP
    I am using Acrobat Professional 8 to assemble a document from two imported page images (JPGs). Acrobat seems to interpret the images at screen resolution, and creates a document that's about 35" by 46" instead of 8.5" x 11". How can I scale down the page size within Acrobat?

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  • How can I split Excel data from one row into multiple rows

    - by Lenny
    Good afternoon, Is there a way to split data from one row and store to separate rows? I have a large file that contains scheduling information and I'm trying to develop a list that comprises each combination of course, day, term and period per line. For example I have a file similiar to this: Crs:Sn Title Tchr TchrName Room Days Terms Periods 7014:01 English I 678 JUNG 300 M,T,W,R,F 3,4 2,3 1034:02 English II 123 MOORE 352 M,T,W,R,F 3 4 7144:02 Algebra 238 VYSOTSKY 352 M,T,W,R,F 3,4 3,4 0180:06 Pub Speaking 23 ROSEN 228 M,T,W,R,F 3,4 5 7200:03 PE I 244 HARILAOU GYM 4 M,T,W,R,F 1,2,3 3 2101:01 Physics/Lab 441 JONES 348 M,T,W,R,F 1,2,3,4 2,3 Should extract to this in an excel file: Crs:Sn Title Tchr# Tchr Room Days Terms Period 7014:01 English I 678 JUNG 300 M 3 2 7014:01 English I 678 JUNG 300 T 3 2 7014:01 English I 678 JUNG 300 W 3 2 7014:01 English I 678 JUNG 300 R 3 2 7014:01 English I 678 JUNG 300 F 3 2 7014:01 English I 678 JUNG 300 M 4 2 7014:01 English I 678 JUNG 300 T 4 2 7014:01 English I 678 JUNG 300 W 4 2 7014:01 English I 678 JUNG 300 R 4 2 7014:01 English I 678 JUNG 300 F 4 2 7014:01 English I 678 JUNG 300 M 3 3 7014:01 English I 678 JUNG 300 T 3 3 7014:01 English I 678 JUNG 300 W 3 3 7014:01 English I 678 JUNG 300 R 3 3 7014:01 English I 678 JUNG 300 F 3 3 7014:01 English I 678 JUNG 300 M 4 3 7014:01 English I 678 JUNG 300 T 4 3 7014:01 English I 678 JUNG 300 W 4 3 7014:01 English I 678 JUNG 300 R 4 3 7014:01 English I 678 JUNG 300 F 4 3 1034:02 English II 123 MOORE 352 M 3 4 1034:02 English II 123 MOORE 352 T 3 4 1034:02 English II 123 MOORE 352 W 3 4 1034:02 English II 123 MOORE 352 R 3 4 1034:02 English II 123 MOORE 352 F 3 4 7144:02 Algebra 238 VYSOTSKY 352 M 3 3 7144:02 Algebra 238 VYSOTSKY 352 T 3 3 7144:02 Algebra 238 VYSOTSKY 352 W 3 3 7144:02 Algebra 238 VYSOTSKY 352 R 3 3 7144:02 Algebra 238 VYSOTSKY 352 F 3 3 7144:02 Algebra 238 VYSOTSKY 352 M 4 3 7144:02 Algebra 238 VYSOTSKY 352 T 4 3 7144:02 Algebra 238 VYSOTSKY 352 W 4 3 7144:02 Algebra 238 VYSOTSKY 352 R 4 3 7144:02 Algebra 238 VYSOTSKY 352 F 4 3 7144:02 Algebra 238 VYSOTSKY 352 M 3 4 7144:02 Algebra 238 VYSOTSKY 352 T 3 4 7144:02 Algebra 238 VYSOTSKY 352 W 3 4 7144:02 Algebra 238 VYSOTSKY 352 R 3 4 7144:02 Algebra 238 VYSOTSKY 352 F 3 4 7144:02 Algebra 238 VYSOTSKY 352 M 4 4 7144:02 Algebra 238 VYSOTSKY 352 T 4 4 7144:02 Algebra 238 VYSOTSKY 352 W 4 4 7144:02 Algebra 238 VYSOTSKY 352 R 4 4 7144:02 Algebra 238 VYSOTSKY 352 F 4 4 0180:06 Pub Speaking 23 ROSEN 228 M 3 5 0180:06 Pub Speaking 23 ROSEN 228 T 3 5 0180:06 Pub Speaking 23 ROSEN 228 W 3 5 0180:06 Pub Speaking 23 ROSEN 228 R 3 5 0180:06 Pub Speaking 23 ROSEN 228 F 3 5 0180:06 Pub Speaking 23 ROSEN 228 M 4 5 0180:06 Pub Speaking 23 ROSEN 228 T 4 5 0180:06 Pub Speaking 23 ROSEN 228 W 4 5 0180:06 Pub Speaking 23 ROSEN 228 R 4 5 0180:06 Pub Speaking 23 ROSEN 228 F 4 5 7200:03 PE I 244 HARILAOU GYM 4 M 1 3 7200:03 PE I 244 HARILAOU GYM 4 M 2 3 7200:03 PE I 244 HARILAOU GYM 4 M 3 3 7200:03 PE I 244 HARILAOU GYM 4 T 1 3 7200:03 PE I 244 HARILAOU GYM 4 T 2 3 7200:03 PE I 244 HARILAOU GYM 4 T 3 3 7200:03 PE I 244 HARILAOU GYM 4 W 1 3 7200:03 PE I 244 HARILAOU GYM 4 W 2 3 7200:03 PE I 244 HARILAOU GYM 4 W 3 3 7200:03 PE I 244 HARILAOU GYM 4 R 1 3 7200:03 PE I 244 HARILAOU GYM 4 R 2 3 7200:03 PE I 244 HARILAOU GYM 4 R 3 3 7200:03 PE I 244 HARILAOU GYM 4 F 1 3 7200:03 PE I 244 HARILAOU GYM 4 F 2 3 7200:03 PE I 244 HARILAOU GYM 4 F 3 3 2101:01 Physics/Lab 441 JONES 348 M 1 2 2101:01 Physics/Lab 441 JONES 348 M 2 2 2101:01 Physics/Lab 441 JONES 348 M 3 2 2101:01 Physics/Lab 441 JONES 348 M 4 2 2101:01 Physics/Lab 441 JONES 348 T 1 2 2101:01 Physics/Lab 441 JONES 348 T 2 2 2101:01 Physics/Lab 441 JONES 348 T 3 2 2101:01 Physics/Lab 441 JONES 348 T 4 2 2101:01 Physics/Lab 441 JONES 348 W 1 2 2101:01 Physics/Lab 441 JONES 348 W 2 2 2101:01 Physics/Lab 441 JONES 348 W 3 2 2101:01 Physics/Lab 441 JONES 348 W 4 2 2101:01 Physics/Lab 441 JONES 348 R 1 2 2101:01 Physics/Lab 441 JONES 348 R 2 2 2101:01 Physics/Lab 441 JONES 348 R 3 2 2101:01 Physics/Lab 441 JONES 348 R 4 2 2101:01 Physics/Lab 441 JONES 348 F 1 2 2101:01 Physics/Lab 441 JONES 348 F 2 2 2101:01 Physics/Lab 441 JONES 348 F 3 2 2101:01 Physics/Lab 441 JONES 348 F 4 2 2101:01 Physics/Lab 441 JONES 348 M 1 3 2101:01 Physics/Lab 441 JONES 348 M 2 3 2101:01 Physics/Lab 441 JONES 348 M 3 3 2101:01 Physics/Lab 441 JONES 348 M 4 3 2101:01 Physics/Lab 441 JONES 348 T 1 3 2101:01 Physics/Lab 441 JONES 348 T 2 3 2101:01 Physics/Lab 441 JONES 348 T 3 3 2101:01 Physics/Lab 441 JONES 348 T 4 3 2101:01 Physics/Lab 441 JONES 348 W 1 3 2101:01 Physics/Lab 441 JONES 348 W 2 3 2101:01 Physics/Lab 441 JONES 348 W 3 3 2101:01 Physics/Lab 441 JONES 348 W 4 3 2101:01 Physics/Lab 441 JONES 348 R 1 3 2101:01 Physics/Lab 441 JONES 348 R 2 3 2101:01 Physics/Lab 441 JONES 348 R 3 3 2101:01 Physics/Lab 441 JONES 348 R 4 3 2101:01 Physics/Lab 441 JONES 348 F 1 3 2101:01 Physics/Lab 441 JONES 348 F 2 3 2101:01 Physics/Lab 441 JONES 348 F 3 3 2101:01 Physics/Lab 441 JONES 348 F 4 3 I'm trying to avoid going line by line separating the data. I'm not well versed on the VBA functionality of Excel, but would like to get started using it. Any help would be greatly appreciated.

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  • WRTU54G-TM T-Mobile@Home router with 3rd party firmware

    - by dlamblin
    I've been doing a lot of reading online about the Linksys WRTU54G-TM router model that I now own. It seems getting a custom firmware onto it is not a problem. But no one is talking about retaining the Voip features (yet). So far they're all disappointed that it's not a SIP machine and used GSM over IPSec. Personally I don't care about using it with non-t-mobile. If I take the original firmware, shouldn't I be able to extract it, and it's SquashFS image, and then move all of the t-mobile specific binaries for enabling the calling features over to a custom firmware installation (maybe OpenWRT)? You might ask why, and the reason is, that if I do this I could retain my calling features, which I do want, and ssh to the router and use it to run additional software, as any OpenWRT router could do. Does anyone know if this can be done, and how the firmware's binaries could be gotten at and installed correctly?

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  • IE8: intense flickering for Flash in Windows 7 RTM

    - by 280Z28
    Whenever I view a page with Flash on it (example www.fox.com), if I move my mouse around the page flickers intensely - like siezure inducing flicker. Is this a known issue, and is there a way to fix it? Windows 7 RTM x64 IE8 Flash Player, Acrobat Reader, Shockwave Player are all I installed Consistent across 3 very different machines (AMD ZM-82 + Radeon HD3200 laptop, Core i7 + NVidia GT220 desktop, P4D + NVidia 6400GT desktop), but all with the above software.

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  • I need a piece software to use with my HP F4280 scanner.

    - by D Connors
    So, I got this printer/scanner about a year ago, and I'm really happy with it. The only thing is that I never really liked the HP scanning software that came with it. A few months ago I reformatted and reinstalled windows 7. Then, once I plugged in the printer, I noticed that windows recognized it automatically, and offered to install all the drivers by itself. So instead of manually installing the driver that came in the CD, I simply let windows automatically install it from its servers, and so far it's great. Instead of HP's scanning software (that really wasn't pleasing me), I got a very simplified interface that is more than enough for my ocasional scanning habits. Until today. Today I had to scan a bunch of old pictures for my father. And that simple interface felt like it was lacking quite a few features to make this repetitive task a little easier. And that's why I'm now looking for a good software to use for scanning. By "good" I mean anything well thought out, and specially anything that will make my life easier when repetitive-scanning. It doesn't need to have professional tweaking options, but having them is not a problem either. You guys got anything?

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  • Bypass BIOS password set by faulty Toshiba firmware on Satellite A55 laptop?

    - by Brian
    How can the CMOS be cleared on the Toshiba Satellite A55-S1065? I have this 7 year old laptop that has been crippled by a glitch in its BIOS: 'A "Password =" prompt may be displayed when the computer is turned on, even though no power-on password has been set. If this happens, there is no password that will satisfy the password request. The computer will be unusable until this problem is resolved. [..] The occurrence of this problem on any particular computer is unpredictable -- it may never happen, but it could happen any time that the computer is turned on. [..] Toshiba will cover the cost of this repair under warranty until Dec 31, 2010.' -Toshiba As they stated, this machine is "unusable." The escape key does not bypass the prompt (nor does any other key), thus no operating system can be booted and no firmware updates can be installed. After doing some research, I found solutions that have been suggested for various Toshiba Satellite models afflicted by this glitch: "Make arrangements with a Toshiba Authorized Service Provider to have this problem resolved." -Toshiba (same link). Even prior to the expiration of Toshiba's support ("repair under warranty until Dec 31, 2010"), there have been reports that this solution is prohibitively expensive, labor charges accruing even when the laptop is still under warranty, and other reports that are generally discouraging: "They were unable to fix it and the guy who worked on it said he couldn’t find the jumpers on the motherboard to clear the BIOS. I paid $39 for my troubles and still have the password problem." - Steve. Since the costs of the repairs can now exceed the value of the hardware, it would seem this is a DIY solution, or a non-solution (i.e. the hardware is trash). Build a Toshiba parallel loopback by stripping and soldering the wires on a DB25 plug to connect connect these pins: 1-5-10, 2-11, 3-17, 4-12, 6-16, 7-13, 8-14, 9-15, 18-25. -CGSecurity. According to a list of supported models on pwcrack, this will likely not work for my Satellite A55-1065 (as well as many other models of similar age). -pwcrack Disconnect the laptop battery for an extended period of time. Doesn't work, laptop sat in a closet for several years without the battery connected and I forgot about the whole thing for awhile. The poor thing. Clear CMOS by setting the proper jumper setting or by removing the CMOS (RTC) battery, or by short circuiting a (hidden?) jumper that looks like a pair of solder marks -various sources for various Satellite models: Satellite A105: "you will see C88 clearly labeled right next the jack that the wireless card plugs into. There are two little solder squares (approx 1/16") at this location" -kerneltrap Satellite 1800: "Underneath the RAM there is black sticker, peel off the black sticker and you will reveal two little solder marks which are actually 'jumpers'. Very carefully hold a flat-head screwdriver touching both points and power on the unit briefly, effectively 'shorting' this circuit." -shadowfax2020 Satellite L300: "Short the B500 solder pads on the system board." -Lester Escobar Satellite A215: "Short the B500 solder pads on the system board." -fixya Clearing the CMOS could resolve the issue, but I cannot locate a jumper or a battery on this board. Nothing that looks remotely like a battery can be removed (everything is soldered). I have looked closely at the area around the memory and do not see any obvious solder pads that could be a secret jumper. Here are pictures (click for full resolution) : Where is the jumper (or solder pads) to short circuit and wipe the CMOS on this board? Possibly related questions: Remove Toshiba laptop BIOS password? Password Problem Toshiba Satellite..

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  • Powering-down USB Powered Devices on laptop sleep

    - by Carl
    I recently purchased a Targus Lap Chill Mat, which is a USB powered device, but doesn't have any interface/storage/etc function. I'd like it to power-down when my (macbook) laptop sleeps (since the fan obviously doesn't need to be running when the laptop is idle) without having to unplug it. Any suggestions?

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  • Using VLC as RTSP server

    - by StackedCrooked
    I'm trying to figure out how to use the server capabilities of VLC. More specifically, how to export an SDP file when RTP streaming. In chapter 4 in the section related to RTP Streaming examples for server and client are given: vlc -vvv input_stream --sout '#rtp{dst=192.168.0.12,port=1234,sdp=rtsp://server.example.org:8080/test.sdp}' vlc rtsp://server.example.org:8080/test.sdp It's not very clear to me how to make it actually work. I have tried these two commands for server and client using two cmd instances: vlc -I rc screen:// --sout=#rtp{dst=127.0.0.1,port=4444,sdp=rtsp://localhost:8080/test.sdp} vlc -I rc rtsp://localhost:8080/test.sdp Invoking the second command causes the first one to crash. The second command shows the error message "could not connect to localhost:8080".

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  • Core i5 Turboboost/C states Freezing computer

    - by Aaron Smith
    I'm not sure which, but I just had a heck of a time getting my computer to boot up and not freeze. It would run until it finished booting windows, then everything would freeze. This happened until I turned off turboboost and all the c states on the processor. What could be causing this? Is the processor going bad?

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  • Is there a way to route all traffic from Android through a proxy/tunnel to my Tomato router?

    - by endolith
    I'd like to be able to connect my Android phone to public Wi-Fi points with unencrypted connections, but People can see what I'm doing by intercepting my radio transmissions People who own the access point can see what I'm doing. There are tools like WeFi and probably others to automatically connect to access points, but I don't trust random APs. I'd like all my traffic to go through an encrypted tunnel to my home router, and from there out to the Internet. I've done such tunnels from other computers with SSH/SOCKS and PPTP before. Is there any way to do this with Android? I've asked the same question on Force Close, so I'll change this question to be about both sides of the tunnel. More specifically: My phone now has CyanogenMod 4.2.3 My router currently has Tomato Version 1.25 I'm willing to change the router firmware, but I was having issues with DD-WRT disconnecting, which is why I'm using Tomato. Some possible solutions: SSH with dynamic SOCKS proxy: Android supposedly supports this through ConnectBot, but I don't know how to get it to route all traffic. Tomato supports this natively. I've been using this with MyEntunnel for my web browsing at work. Requires setting up each app to go through the proxy, though. PPTP: Android supports this natively. Tomato does not support this, unless you get the jyavenard mod and compile it? I previously used PPTP for web browsing at work and in China because it's native in Windows and DD-WRT. After a while I started having problems with it, then I started having problems with DD-WRT, so I switched to the SSH tunnel instead. Also it supposedly has security flaws, but I don't understand how big of a problem it is. IPSec L2TP: Android (phone) and Windows (work/China) both support this natively I don't know of a router that does. I could run it on my computer using openswan, but then there are two points of failure. OpenVPN: CyanogenMod apparently includes this, and now has an entry to create a new OpenVPN in the normal VPN interface, but I have no idea how to configure it. TunnelDroid apparently handles some of this. Future versions will have native support in the VPN settings? Tomato does not support this, but there are mods that do? I don't know how to configure this, either. TomatoVPN roadkill mod SgtPepperKSU mod Thor mod I could also run a VPN server on my desktop, I guess, though that's less reliable and presumably slower than running it in the router itself. I could change the router firmware, but I'm wary of more fundamental things breaking. Tomato has been problem-free for the regular stuff. Related: Anyone set up a SSH tunnel to their (rooted) G1 for browsing?

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  • What free space thresholds/limits are advisable for 640 GB and 2 TB hard disk drives with ZEVO ZFS on OS X?

    - by Graham Perrin
    Assuming that free space advice for ZEVO will not differ from advice for other modern implementations of ZFS … Question Please, what percentages or amounts of free space are advisable for hard disk drives of the following sizes? 640 GB 2 TB Thoughts A standard answer for modern implementations of ZFS might be "no more than 96 percent full". However if apply that to (say) a single-disk 640 GB dataset where some of the files most commonly used (by VirtualBox) are larger than 15 GB each, then I guess that blocks for those files will become sub optimally spread across the platters with around 26 GB free. I read that in most cases, fragmentation and defragmentation should not be a concern with ZFS. Sill, I like the mental picture of most fragments of a large .vdi in reasonably close proximity to each other. (Do features of ZFS make that wish for proximity too old-fashioned?) Side note: there might arise the question of how to optimise performance after a threshold is 'broken'. If it arises, I'll keep it separate. Background On a 640 GB StoreJet Transcend (product ID 0x2329) in the past I probably went beyond an advisable threshold. Currently the largest file is around 17 GB –  – and I doubt that any .vdi or other file on this disk will grow beyond 40 GB. (Ignore the purple masses, those are bundles of 8 MB band files.) Without HFS Plus: the thresholds of twenty, ten and five percent that I associate with Mobile Time Machine file system need not apply. I currently use ZEVO Community Edition 1.1.1 with Mountain Lion, OS X 10.8.2, but I'd like answers to be not too version-specific. References, chronological order ZFS Block Allocation (Jeff Bonwick's Blog) (2006-11-04) Space Maps (Jeff Bonwick's Blog) (2007-09-13) Doubling Exchange Performance (Bizarre ! Vous avez dit Bizarre ?) (2010-03-11) … So to solve this problem, what went in 2010/Q1 software release is multifold. The most important thing is: we increased the threshold at which we switched from 'first fit' (go fast) to 'best fit' (pack tight) from 70% full to 96% full. With TB drives, each slab is at least 5GB and 4% is still 200MB plenty of space and no need to do anything radical before that. This gave us the biggest bang. Second, instead of trying to reuse the same primary slabs until it failed an allocation we decided to stop giving the primary slab this preferential threatment as soon as the biggest allocation that could be satisfied by a slab was down to 128K (metaslab_df_alloc_threshold). At that point we were ready to switch to another slab that had more free space. We also decided to reduce the SMO bonus. Before, a slab that was 50% empty was preferred over slabs that had never been used. In order to foster more write aggregation, we reduced the threshold to 33% empty. This means that a random write workload now spread to more slabs where each one will have larger amount of free space leading to more write aggregation. Finally we also saw that slab loading was contributing to lower performance and implemented a slab prefetch mechanism to reduce down time associated with that operation. The conjunction of all these changes lead to 50% improved OLTP and 70% reduced variability from run to run … OLTP Improvements in Sun Storage 7000 2010.Q1 (Performance Profiles) (2010-03-11) Alasdair on Everything » ZFS runs really slowly when free disk usage goes above 80% (2010-07-18) where commentary includes: … OpenSolaris has changed this in onnv revision 11146 … [CFT] Improved ZFS metaslab code (faster write speed) (2010-08-22)

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  • SD cards and CPRM protection

    - by Francesco Turco
    Before buying an SD memory card, I'd like to know something more about the CPRM protection, in particular: Does CPRM influence the way I am supposed to access my own data? That is, does CPRM encrypt it? Could CPRM prevent me from accessing my own data? Is it possible to disable or eliminate CPRM from either the memory card or the card reader? Are there manufacturers selling CPRM-free SD memory cards? Is there any real alternative to CPRM-protected SD memory cards beside USB flash drives? Is Linux support for SD cards good? Thanks.

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