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• How is it possible for SSD's drives to have such a good latency?

  - by tigrou

  First time i read some information about SSD's, i was surprised to learn they internally use NAND flash chips. This kind of memory is generally slow (low bandwidth) and have high latency while SSD's are just the opposite. But here is how it works : SSD drives increase their bandwidth by using several NAND flash chips in parallel. In other words, they do some data striping (aka RAID0) across several chips (done by the controller). What i don't understand is how SSD's drives have such a low latency, whereas they are using NAND chips? (or at least lot better than what a typical single NAND chip would do) EDIT: I think under-estimate NAND chip capabilities. USB drives, while powered by NAND's are mostly limited by USB protocol (which have a pretty high latency) and the USB controller. That explain their poor performance in some cases.

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• External drives show up in Nautilus/Computer even when they are unplugged.

  - by Testament

  I have two 1TB Seagate USB (sdc1 and sdd1) drives connected to an old PC running Fedora 11 without an X server running. Since sdc1 and sdd1 change depending on the order in which they are plugged in, I decided to mount them using their UUID instead. These are my fstab entries UUID=d1b28578-451b-4f03-af28-2e8a6d5b7efb /media/Seagate ext3 defaults,rw,auto,users UUID=36bf5df4-934e-42d4-9e25-16a13971509c /media/Projects ext3 defaults,rw,auto,users They work fine, but when I unmount them and unplug the USB drives, they still show up in Nautilus (I'm running nautilus with X11 forwarding to an Ubuntu machine, btw). Now if I remove those entries from fstab, the drives disappear from Computer. If I add the entries back, they show up as an unmounted drive even when the drive is not plugged in. How do I do this so they don't show up when they're not plugged in?

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• External drives show up in Nautilus/Computer even when they are unplugged.

  - by Testament

  I have two 1TB Seagate USB (sdc1 and sdd1) drives connected to an old PC without an X server running. Since sdc1 and sdd1 change depending on the order in which they are plugged in, I decided to mount them using their UUID instead. These are my fstab entries UUID=d1b28578-451b-4f03-af28-2e8a6d5b7efb /media/Seagate ext3 defaults,rw,auto,users UUID=36bf5df4-934e-42d4-9e25-16a13971509c /media/Projects ext3 defaults,rw,auto,users They work fine, but when I unmount them and unplug the USB drives, they still show up in Nautilus (I'm running nautilus with X11 forwarding onto another Ubuntu machine, btw). Now if I remove those entries from fstab, the drives disappear from Computer. If I add the entries back, they show up as an unmounted drive even when the drive is not plugged in. How do I do this so they don't show up when they're not plugged in?

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• How common are power supply failures in comparison to hard disk failures?

  - by Adrian Grigore

  Hi, My webhost offers two different types of high availability options for dedicated servers: Redundant hard disks (RAID1) Redundant hard disks (RAID1) plus redundant power supply How common is a power supply failure in comparison to hard disk failure? I know it's not possible to know the exact figures without knowing the exact hardware, but ballpark figures are good enough for me at the moment. Thanks, Adrian

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• Repair GRUB bootloader for multiboot system

  - by user1715324

  I have two hard disks – one a 1TB and the other a 250 GB. I installed the OSes in the following order: Windows 7 on the first hard disk (1 TB) After that Kubuntu 12.04 on a partition (/dev/sdb7) on the second hard disk (250 GB) The second drive also contains an NTFS partition. Now, kubuntu's bootloader was installed on the second hard drive's MBR (and successfully detected Windows 7). So, whenever I wanted to load Windows I used to select the first hard disk from the BIOS boot menu and the second hard disk whenever I wanted to load kubuntu. I know I could have set the second hard disk as the default drive, still I prefered this method. The problem started when I installed Linux Mint 13 on the second hard disk (/dev/sdb3) and overwrote kubuntu's original MBR. Now, the GRUB just detects Mint and Windows. The MBR on the 1 TB hard disk is untouched. Is there a way I can modify the MBR on the second hard disk now so that it will show kubuntu and Mint both?

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• How should I buy a laptop with a solid state hard drive?

  - by Kragen

  I'm looking into buying myself a new laptop, and I'd like to get a solid state hard drive. I've been looking around for laptops and I can see a few are solid with solid state hard drives, however the choice generaly tends to be very limited compared with standard drives. What is the best way to go about buying a laptop with a solid state hard drive? Should I look at laptops that come with SSD's included, or am I better off looking at "normal" laptops, and buying the SSD separately and fitting it myself?

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• Programming in the United States Airforce - How hard to get a job doing it? [closed]

  - by Holland

  I already know how to program. Been at it for a year; the language I've worked mostly with has been C++, and I'm currently studying x86 assembly programming, with the goal to move towards ARM assembly after I've finished with that. Thus, given my experience and knowledge, I'm curious to know if any "vets" around here have had any excursions in the military doing software/electrical engineering, and how hard it would be to actually get a job doing it - with someone who already has previous experience and knowledge regarding that field, however slight. By definition of "hard", in this context, I suppose I'd be referring to the required knowledge to actually be a "shoe-in" for both low level and high level software/hardware applications. I know hex fairly well, and enough to convert that hex to binary. I also have an ok knowledge of algorithms, such as Binary Search Tree, Linked List, etc. Everything I've learned so far has been self taught for the most part.

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• Launch a real install of Ubuntu already on another hard-drive in Windows 7 like a VM

  - by Chad M

  I'm not too familiar with VMs and the like so this may not even be possible. Here is what I have: A real, full install of Windows 7 on hard drive A. A real, full install of Ubuntu 10.04 on hard drive B. Grub allowing me to select what I want to launch when I start up my computer. It would be Amazing if I could do one of two things. Within Windows 7, launch my real install of ubuntu as if it were a VM. That means i would get all the installed software, all of the files, and all of the settings. Launch a VM copy of ubuntu 10.04 but some how make it use all of the installed software and settings from my real copy. Thanks!

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• USB 3.0 hard disk not detected on a particular host controller?

  - by Alvin Wong

  I have a USB 3.0 hard disk which has always been working on my desktop with an XHCI. Now I just bought a notebook with an XHCI (something with Intel's Ivy Bridge setup). The first time I plug the hard disk in its 3.0 port it is detected and working. A few hours later I try to connect it again, but seems that the notebook just ignored it! The light on the hard disk didn't blink as usual (instead it is hold at on). I then tested it with my desktop again and it is working perfectly. It gets trickier when I plug it in the USB 2.0 port of that notebook it is detected and working perfectly (despite the slower speed). Then I try to plug in an USB 2.0 USB flash drive to that USB 3.0 port, and it is detected (of course as USB 2.0). So, there are two USB 3.0 ports on my notebook's XHCI. Both of them are not working with my hard disk but working perfectly fine with my USB 2.0 UFD. What's wrong with it? When I plug in the hard disk, device manager doesn't change. I've tried re-installing the driver for the XHCI, but it changes nothing. Had I broke the USB 3.0-specific pins of both USB 3.0 ports?

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• Why is it so hard to find anything on MS site?

  - by Amir Rezaei

  I have always had this question in my mind and I would really be happy to get an explanation for this. Is it only me or do you also feel the same way that it's hard to find anything on MS site. For example, every time I need to download .NET framework I have to Google it. You never know what you can download, no category for downloads. You are simply left to a search field. You never know if you downloaded the latest version of the file. The tragically true is that you have to rely on their competitor Google to find anything on their site. I know that they are a big company. But is it really that hard to have an organized way to publish information?

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• How do I add a second hard drive (within Virtual PC) without formatting it?

  - by Clay Nichols

  I'm trying to add a second hard drive within Virtual PC without formatting it. I followed the instructions for adding a second hard drive but when I add go the the Computer ManagementDisk Management console it wants to format it. The reason I want to add this second hard drive is that it has data on it that I want available to this instance of Virtual PC

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• What caused Cyclic Redundancy Check error on my BitLocker-enabled external hard drive and how to fix it?

  - by Forgiver

  I have an external hard drive that is connected to my computer (Windows 7 Ultimate 64 bit) via a USB port. BitLocker has been activated on the hard drive to protect the data. Yesterday I started downloading a huge data from the internet but now it failed to complete because of CRC error. I tried to repair it with chkdsk f:/r where f is the drive letter of that hard drive. There are many messages reporting "unreadable" as follows: What caused Cyclic Redundancy Check error on my BitLocker-enabled external hard drive and how to fix it?

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• Is Software Raid1 Using mdadm with a Local Hard Disk and GNDB Possible?

  - by Travis

  I have multiple webservers which use many small files to created dynamic web pages. Caching the web pages isn't an option. The webserver also performs writes so I need a synchronous filesystem. I'm looking to maximise performance as it's my understanding that small files is the weakness (to varying degreess) of a cluster filesystem over ethernet. Currently I'm using Centos 5.5, 64 bit. Since it's only about 300MB of data, I'm looking at mdadm using RAID-1 with the GNBD and a local hard disk using the "--write-mostly" option so the reads are done using the local hard disk. Is this possible? If so, is there any advantage to making it a tmpfs disk instead of a local hard disk? Or will the files on the local hard disk just get cached in RAM anyway so I won't see a performance gain by using tmpfs, assuming there's enough RAM available?

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• Is it possible to copy recordings off of a DVR box hard drive?

  - by bdr9

  My cable TV company gives me a Cisco Explorer 8640HDC DVR box that can record shows from TV. I know that it contains a hard drive to save the shows on. What format and file system are used to store the videos on the hard drive? I have looked at the documentation for this DVR box and there is no technical information about the manner in which recordings are stored. Is it possible to connect the hard drive to a computer and extract the recordings from it?

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• Windows 7: Can not safely remove hard-drive when using shared library function.

  - by user26684

  When using Windows 7 libraries for an external hard-drive. There is a problem when I go to safely remove the hard-drive. Windows won't let me because I have the drive assigned to the libraries feature. So the only way I can safely remove the external drive is to remove the library feature. Is there way to keep the library feature on and still safely remove the external hard-drive?

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• Does a hard drive "working hard", i.e. when defragmenting or otherwise continuously active, significantly affect a laptop's temperature?

  - by Marko

  Trying to diagnose and fix an overheating Acer 5735 laptop, running speedfan and doing general workload to try and cause the overheat conditions. I notice that windows xp is badly fragmented according to defraggler, at 58% fragmentation. So I defrag whilst watching the speedfan window, which was at the start reporting high warning style symbols for all of the sensors. After the defrag, I rebooted and ran a few programs, and even defraggler again and the sensors in speedfan all reported green i.e. not high. Wondering if there is a correlation between windows fragmentation causing the hard drive to work harder and produce more heat inside the laptop? dont want to just assume that the problems are resolved, so either speedfan is not accurate enough or fragmentation can lead to additional hard drive heat? All comments or suggestions welcome.

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• Is there any hard data on the (dis-)advantages of working from home?

  - by peterchen

  Is there any hard data (studies, comparisons, not-just-gut-feel analysis) on the advantages and disadvantages of working from home? My devs asked about e.g. working from home one day per week, the boss doesn't like it for various reasons, some of which I agree with but I think they don't necessarily apply in this case. We have real offices (2..3 people each), distractions are still common. IMO it would be beneficial for focus, and with 1 day / week, there wouldn't be much loss at interaction and communication. In addition it would be a great perk, and saving the commute. Related: Pros and Cons of working Remotely/from Home (interesting points, but no hard facts) [edit] Thanks for all the feedback! To clarify: it's not my decision to make, I agree that there are pro's and con's depending on circumstances, and we are pushing for "just try it". I've asked this specific question because (a) facts are a good addition to thoughts in arguing with an engineer boss, and (b) we, as developers, should build upon facts like every respectable trade.

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• How do I install Ubuntu on a second hard drive?

  - by Keith454

  I am going to be buying a second hard drive for my desktop here pretty soon, because my current hard drive is a piece of junk running windows 7. What I want to know is how to install Ubuntu on the second drive. I am looking for a non complicated answer as I am not familiar with the Ubuntu lingo. I am so sick of Windows.. I used Ubuntu before but it didn't work properly. When i installed it, it said I didn't have enough space... Even tho I had 600GB to use. Anyway if anyone can help me out it would be much appreciated. Thanks

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• If the size of the (accessible) RAM is limited, why isn't the hard disk?

  - by sub

  When the number of possible RAM adresses is limited by the computer architecture (32/64 bit), why isn't the size of the hard disk limited? Or is it limited? If yes, what would be the highest possible size of a hard-disk for a 32-bit computer? How are the adresses of hard-disks handled then?

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• How do I configure my 2 RAID drives so I can use it as /home?

  - by Kenn

  I've installed Ubuntu 11 64-bit to a 2 TB drive. it is on /dev/sda - port 1 of SATA Host Adaptor. This contains /dev/sda1 (1 MB boot), /dev/sda2 (2TB EXT4), /dev/sda3 8.6GB SWAP. I also have: /dev/sdb 2TB RAID COMPONENT /dev/sdc 2TB RAID COMPONENT which also show as /dev/dm-0 not partitioned /dev/dm-2 not partitioned which is mounted as /media/RAID_HOME I'm completely stumped as to how to use this version of Ubuntu to make these drives seem as just one raid mirrored drive and then how to transfer /home onto it.

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• If a raid controller changes, are the drives still usable without re-formatting?

  - by Jeremy

  I've been wanting to do a raid 1 setup in my home with a pair of sata drives. Someone told me that if the controller fails, you can't just get a new controller because you'll have to reformat the drives. Or is that true only in some implementations? I was originally just looking at an onboard raid controller, or an entry level nas drvice like the intel SS4200-E, but If the hardware (controller) ever fails, will I be out of luck accessing the data if I can't get the exact same hardware to replace it?

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• How to list all files on all hard drives with output in MS-DOS batch?

  - by Leandro

  How can I list all files (including system and hidden) on all hard drives (not removable drives)? I think in something like a: dir -a -h *.* /s > file.txt but this is for the specific drive where I'm. How can I do something like that but with C:, D:, etc, but I don't know the DOS's name of the drivers, and i need a .bat to do this (an automatic listing). Implementer can't also know the names of drivers.

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• Network drives don't get mapped and desktop redirection stops working when domain user becomes a member of the Local Administrator group on their PC

  - by Kim Jong-Un

  We have a Small Business Server 2003 domain controller with Windows 7 workstations joined to the domain. I noticed recently that, if I make a user a local administrator on his computer, his redirected desktop and mapped network drives do not connect at login (error on login that network drives inaccessible and desktop is blank). However, it is still possible for this user to browse to his home directory where his redirected folders are located- so he still has access to that location. Does anyone have any theories as to what is going on here?

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• Laptop will boot to some usb flash drives but not others.

  - by evolvd

  Laptop: HP Compaq 6710b I can boot from usb just fine with the following usb flash drives: Cruzer micro 4GB HP 4GB The flash drive that will not boot: Flash Voyager 8GB To knock out variables I did the following: Using Hard Disk Low Level Format Tool I performed a low level format Full erase with Flash Memory Tookit In windows 7 I formated the drive to fat32 Used USB-Boot-Tester to write to the drive Also used uNetbooting with various distros to see if that would make a difference My guesses on what could be preventing the drive from booting: The laptop does not support booting to usb flash drives larger than 4GB The drive is defective in some way

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• Possible to (re)sync 2 drives into RAID 1 Array?

  - by MsLis

  Have an XP machine with 2 drives configured in a RAID 1 array. Trying to fix a boot problem, I took the drives out to run chkdsk on them, and I accidentally got them out-of-sync (event logs, etc). Is there any way to duplicate the contents of one drive onto the other to restore their RAID-ness, or have I really messed myself up?

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