Search Results

Search found 13047 results on 522 pages for 'np hard'.

Page 3/522 | < Previous Page | 1 2 3 4 5 6 7 8 9 10 11 12  | Next Page >

• Install failing new hard drives

  - by John

  I'm trying to install Ubuntu server 12.04 on my new hard drives but it seems to fail. Once past the option menu where is asked the partition to install the OS on, goes into a hold and no progress is shown afterwards. The hard disk I'm trying to install it on is: Western Digital WD20EARX The installation process hangs around 'installing core packages/installing the base system' . The CD comes through the test with being valid/ok. any help would be appreciated. Thanks in advance.

  Read the article

• External hard-drive is "clicking" when idle [closed]

  - by mirumir

  I'm struggling with a very annoying issue: My new hard-drive (Samsung Spinpoint M8 1TB (HN-M101MBB) was build in an USB 3.0 external case (Lian Li EX-10QR) and formatted with ext4. When this hard-drive is connected to my Notebook via USB 2.0 it "klicks", the LED flashs too, every second, but only when it's idle! It stays silent, when something is copying or reading from it. But when this drive was formatted with ext3 or fat, it always remained silent. This also happens with a Western Digital WD10JPVT Scorpio Blue, but the "klicks" are even louder! System: 12.04 64-bit with Gnome-Shell. Any ideas how to approach this issue?

  Read the article

• Slow tranfer to external USB3 hard drive

  - by JMP

  Trying to backup data from hard drive before reloading windows following some issue with its load. Having trouble with the file transfer to a USB3/2 external hard drive NTFS. Getting transfer speed of about 116.7kB/sec. In other words its taking about 5 hours to tranfer 1.4GB. I've got about 80GB to go. So the transfer is going to take 11days. Seems a little on the slow side. Am I missing something? Is there a way to make this faster. No issue with the external drive tranferring this amount in windows. But don't have that option at the moment.

  Read the article

• Partition Hard Drive For Data

  - by user211779

  Greetings ~ I am a new Linux/Ubuntu user. For various reasons (mostly my own ignorance) I am on my third install of Ubuntu 12.04. I want to partition the hard drive to create a drive for data and personal files in case I ever have to install again. I have been struggling all afternoon to make a gparted live USB. Tuxboot looked like the answer but I get an error message when using it. So, I am asking for help. Ultimately, I want to partition the hard drive for data and personal files. What do you recommend?

  Read the article

• Maxtor 500GB external hard drive not being detected but power is going to it?

  - by ClarkeyBoy

  I have 2 * Maxtor Onetouch 4 Lite 500GB external hard drives (part no. 9NT2A4-500). They both used to work fine on my old laptop (an Acer) but I have not used them for about a year, since my laptop was stolen and I got this one (also an Acer [Aspire 7738G]). I have one plugged into the mains with one of the leads I believe was supplied with them. It appears to be receiving power as it is warm and the power light (on the unit itself) is on; also the mains adapter is fairly warm. I also have it plugged into my laptop with a USB lead which I have tested on my mp3 player (so I know it works). However my hard drive is not showing on my computer. I have tried checking for new hardware, installing the software that was supplied with it, checking drive letters in case it is registered as C: or something stupid, checking for problems etc... I can't find any cause for it to do this. It does appear to be starting up and, possibly, shutting down and restarting constantly (that's what it sounds like altho I can't be certain). I have had both hard drives stored in different places for the last year and they're both doing the same thing.. if it was only one then I'd guess it had got damaged or corrupted or something but since it is both I doubt this is it. The only things in common with both of them are the leads and the laptop, however I know the USB lead works and guess the mains lead works as there is power going to the unit. Has anyone come across this before or does anyone have any idea what the cause / solution to the problem is? Any help would be greatly appreciated. Regards, Richard

  Read the article

• The subsets-sum problem and the solvability of NP-complete problems

  - by G.E.M.

  I was reading about the subset-sums problem when I came up with what appears to be a general-purpose algorithm for solving it: (defun subset-contains-sum (set sum) (let ((subsets) (new-subset) (new-sum)) (dolist (element set) (dolist (subset-sum subsets) (setf new-subset (cons element (car subset-sum))) (setf new-sum (+ element (cdr subset-sum))) (if (= new-sum sum) (return-from subset-contains-sum new-subset)) (setf subsets (cons (cons new-subset new-sum) subsets))) (setf subsets (cons (cons element element) subsets))))) "set" is a list not containing duplicates and "sum" is the sum to search subsets for. "subsets" is a list of cons cells where the "car" is a subset list and the "cdr" is the sum of that subset. New subsets are created from old ones in O(1) time by just cons'ing the element to the front. I am not sure what the runtime complexity of it is, but appears that with each element "sum" grows by, the size of "subsets" doubles, plus one, so it appears to me to at least be quadratic. I am posting this because my impression before was that NP-complete problems tend to be intractable and that the best one can usually hope for is a heuristic, but this appears to be a general-purpose solution that will, assuming you have the CPU cycles, always give you the correct answer. How many other NP-complete problems can be solved like this one?

  Read the article

• Move virtual machine hard disk to a separate physical hard disk for better performance?

  - by joeeoj

  I have a dual-core machine with the host OS and many guest virtual OSs. Although I have 8GB of RAM, I notice a slowdown when I turn some virtual machine on (and it takes only 1GB RAM). I was told that I should move virtual machine hard disk file to a separate (another) physical hard drive in my PC to get better performance. This way the head of the hard disk would not have to jump from the virtual OS to the host OS as each hard drive would have its own head to deal with the OS: hard drive 1 head for host OS and hard drive 2 head for guest OS. Is this true? Should I get another hard disk only for virtual machine hard disk files?

  Read the article

• VirtualBox : increase hard disk size of the virtual machine

  - by wim

  I have run out of space on my WinXP virtual machine, which I only gave 10 GB space for when I created it. Is there an easy way to increase it to, say, 20 GB? I can't see any obvious option in VirtualBox settings. edit: the suggestion below gives this error wim@wim-ubuntu:/media/data/winxp_vm$ VBoxManage modifyhd wim.vdi --resize 20000 VBoxManage: error: Cannot register the hard disk '/media/data/winxp_vm/wim.vdi' {46284957-2c09-4e70-8a49-bfbe0f7f681d} because a hard disk '/home/wim/VirtualBox VMs/winxp_vm/wim.vdi' with UUID {46284957-2c09-4e70-8a49-bfbe0f7f681d} already exists VBoxManage: error: Details: code NS_ERROR_INVALID_ARG (0x80070057), component VirtualBox, interface IVirtualBox, callee nsISupports Context: "OpenMedium(Bstr(pszFilenameOrUuid).raw(), enmDevType, AccessMode_ReadWrite, fForceNewUuidOnOpen, pMedium.asOutParam())" at line 210 of file VBoxManageDisk.cpp edit2: removing the .vdi from VirtualBox before calling VBoxManage command, then adding it back in, was successful. But now I can't boot the virtual machine, I get this worrying screen: By the way, it says FATAL: Could not read from the boot medium! System halted. edit3: The vdi must be reattached to the VM after VBoxManage command. Further, the partition will need to be resized from WITHIN windows, because you will have this empty space: I was able to resize the partition easily using a bit of freeware called EASEUS Partition Master 9.1.0 Home Edition.

  Read the article

• Can't access external hard drives or thumb drives

  - by calden

  I am not a complete linux noob but I don't know a lot either and would greatly appreciate some help with this. I just installed Ubuntu 10.10 onto my laptop. Everything is working great however USB devices such as thumb drives and external hard drives wont show up. I have been looking around a bit and when I run sudo fdisk -l it displays this: Disk /dev/sda: 250.1 GB, 250059350016 bytes 255 heads, 63 sectors/track, 30401 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00065684 Device Boot Start End Blocks Id System /dev/sda1 * 1 29255 234983424 83 Linux /dev/sda2 29255 30402 9212929 5 Extended /dev/sda5 29255 30402 9212928 82 Linux swap / Solaris Disk /dev/sdb: 16.0 GB, 16026435072 bytes 64 heads, 32 sectors/track, 15283 cylinders Units = cylinders of 2048 * 512 = 1048576 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000df90d Device Boot Start End Blocks Id System /dev/sdb1 * 1 15283 15649776 7 HPFS/NTFS It does seem to display my 16 gig thumb drive but other then seeing it here I cant access it to read and write files to it. It does the same with my external hard drive. I know those devices work as I have tried them on my other computer and they are working fine. Also this is what is in fstab if this will help anybody help me: proc /proc proc nodev,noexec,nosuid 0 0 /dev/sdb1 / ext4 errors=remount-ro 0 1 /dev/sdb5 none swap sw 0 0 Thank you very much for the help everyone.

  Read the article

• Why is Ubuntu unmounting my primary hard drive?

  - by Twisol

  I'm running Ubuntu 10.10 on my laptop (an Asus G73j), dual-booting Windows 7 if that matters. After using the computer for couple of hours or so, I get a popup complaining that a file was unmounted, then my GNOME desktop panels disappear. I can't save any unsaved work (the file browser shows "Filesystem" as totally empty), and other programs break in odd ways (like Chrome can't browse to any new pages, but keeps current ones going... at least I still have Pandora to listen to when this happens!). I've tried looking in the system logs to no avail; I'm assuming that it can't write any errors to the logs because, of course, the logs are on the primary hard drives. This started happening maybe a few days ago. Yesterday I upgraded from 10.4, but I believe it was happening before then. Any advice for figuring this out? EDIT: It just happened again, and I heard a small little clicky sound from the hard drive about five seconds before things went south. I'm thinking I should start backing up ASAP. In response to a comment, here's the dmesg output: http://askubuntu.pastebin.com/uYGshBay Also, the SMART status says the disk has a few bad sectors, and the detailed data says there are 14. It says it passed the self-assessment though. Lastly, this doesn't seem to be happening when I'm on Windows. I recently re-enabled ureadahead (which I disabled ages ago because it was causing Ubuntu to hang at the startup logo), could that be the source of the problem? I've disabled it again to see.

  Read the article

• Which hard disk drive is which?

  - by djeikyb

  I want to know which hard disk drive corresponds to which device path. It's trivial to match the hard disk stats (brand, size) with the dev path, but I want more. I want to know which drive is which inside my case. What's a good way to go about getting this info? Rules: I am a lazy bum. I don't want to tear apart my server to remove all the drives, then add back one by one. A reboot is acceptable. The drives are inconveniently scrunched together in the case. All label information is hidden. The case can be opened. Most disks are SATA, so theoretically hot swappable. Unplugging cables is fair game. Bonus: For a cli only solution. I'll award answer to the best/easiest gui or cli answer, and give a bounty to the next-best answer of the other kind. Or maybe the other way around, because the bounty is worth more points.

  Read the article

• Installing Windows from Ubuntu while booting only from the hard drive

  - by WindowsEscapist

  My problem is unrelated to this workaround (the question) here, but the end result is that I cannot change boot order (or use a boot menu) on my laptop. It is currently running Ubuntu 12.04 with a dual-boot to Fedora if anything goes catastrophically wrong with Ubuntu (read "if I mess it up"). I would really like to install Windows 7 (but XP would be fine) on an empty FAT32 partition I have already made because of issues with WINE-emulated programs running more slowly than under Windows. The problem is, I can only boot from my hard drive. I can boot from other devices by removing the hard drive, but this is irrelevant because SATA is non-hotpluggable (I can't plug it back in to install). Is there any way I could boot up a Windows installer CD (or other CDs)? (I know how to keep my Linux distros.) I have both the .iso's and the physical CDs (or can obtain them). This may be unneeded, but just as a disclaimer this is completely legal. The computer belongs to me, I have admin privs, etc. I'm not doing anything shady!

  Read the article

• recovering raid 0 hard disk

  - by Hiawatha

  I bumped to a huge (for me) problem. I was running dual boot system (win 7 / linux) and at some point I decided to test fedora ( I am new in Linux ). My hard disk conf: 3 hard disks each 1 TB, 2 set to raid 0 with windows running on it and 1 for linux. After installing it from live usb I found out that windows 7 is not in grub anymore and while booting shows raid error. I installed back Ubuntu and ran Disk Utility and checked now I have one disks (raid 0) failed (READ) error. First has 5 bad sectors and second has 1 bad sector. And now I dont know what to do and how to repair. further I dont know which data i could provide to get help. I tried ntfsfix and got this output: Mounting volume... NTFS signature is missing. FAILED Attempting to correct errors... NTFS signature is missing. FAILED Failed to startup volume: Invalid argument NTFS signature is missing. Trying the alternate boot sector Unrecoverable error Volume is corrupt. You should run chkdsk. #sudo ntfs-3g -o force,rw /dev/sdb /media/windows NTFS signature is missing. Failed to mount '/dev/sdb': Invalid argument The device '/dev/sdb' doesn't seem to have a valid NTFS. Maybe the wrong device is used? Or the whole disk instead of a partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around?

  Read the article

• Is the board game "Go" NP complete?

  - by sharkin

  There are plenty of Chess AI's around, and evidently some are good enough to beat some of the world's greatest players. I've heard that many attempts have been made to write successful AI's for the board game Go, but so far nothing has been conceived beyond average amateur level. Could it be that the task of mathematically calculating the optimal move at any given time in Go is an NP-complete problem?

  Read the article

• Does Hard Drive Orientation Affect Its Lifespan?

  - by Jason Fitzpatrick

  Many cases allow you to mount drives in vertical or horizontal configurations and external drives can be easily repositioned. Does the orientation of the hard drive affect the performance and longevity of the drive? Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-drive grouping of Q&A web sites. 6 Ways Windows 8 Is More Secure Than Windows 7 HTG Explains: Why It’s Good That Your Computer’s RAM Is Full 10 Awesome Improvements For Desktop Users in Windows 8

  Read the article

• Why doesn't Ubuntu detect my second hard drive?

  - by user93179

  I am new to Linux and to Ubuntu, I was wondering, I have two hard drives setup in SATA ports (non-raid, at least I don't think they are). I installed ubuntu unto the drives fresh without any previous versions or windows at all. However when I got the Ubuntu 12.04 LTS working, all I see is 1 x 120 gigabyte harddrive. Also, not sure if this is important or not, my hard drives are SSD. My computer specs are Asus P9Z77-V-LK Nvidia Geforce GTX 660 TI Intel i5 3570k 3.4 /proc/partitions shows: major minor #blocks name 8 0 117220824 sda 8 1 117219328 sda1 8 16 117220824 sdb 8 17 96256 sdb1 8 18 108780544 sdb2 8 19 8342528 sdb3 11 0 1048575 sr0 and ls -l /sys/block/ | grep -v /virtual/: lrwxrwxrwx 1 root root 0 Sep 27 17:26 sda - ../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda lrwxrwxrwx 1 root root 0 Sep 27 17:26 sdb - ../devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0/block/sdb lrwxrwxrwx 1 root root 0 Sep 27 22:26 sdc - ../devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.1/1-1.1:1.0/host6/target6:0:0/6:0:0:0/block/sdc lrwxrwxrwx 1 root root 0 Sep 27 22:04 sr0 - ../devices/pci0000:00/0000:00:1f.2/host3/target3:0:0/3:0:0:0/block/sr0 sudo file -s /dev/sd*: /dev/sda: x86 boot sector; partition 1: ID=0x7, starthead 32, startsector 2048, 234438656 sectors, code offset 0xc0, OEM-ID " ?", Bytes/sector 190, sectors/cluster 124, reserved sectors 191, FATs 6, root entries 185, sectors 64514 (volumes 32 MB) , physical drive 0x7e, dos 32 MB) , FAT (32 bit), sectors/FAT 749, reserved3 0x800000, serial number 0x35361a2b, unlabeled /dev/sdb2: Linux rev 1.0 ext4 filesystem data, UUID=387761ac-5eba-4d0f-93ba-746a82fb541d (needs journal recovery) (extents) (large files) (huge files) /dev/sdb3: data /dev/sdc: x86 boot sector; partition 1: ID=0xc, active, starthead 0, startsector 8064, 30473088 sectors, code offset 0xc0 /dev/sdc1: x86 boot sector, code offset 0x58, OEM-ID "SYSLINUX", sectors/cluster 64, reserved sectors 944, Media descriptor 0xf8, heads 128, hidden sectors 8064, sectors 30473088 (volumes 32 MB) , FAT (32 bit), sectors/FAT 3720, Backup boot sector 8, serial number 0xf90c12e9, label: "KINGSTON " /dev/sda1: x86 boot sector, code offset 0x52, OEM-ID "NTFS ", sectors/cluster 8, reserved sectors 0, Media descriptor 0xf8, heads 255, hidden sectors 2048, dos 32 MB) , FAT (32 bit), sectors/FAT 749, reserved3 0x800000, serial number 0x35361a2b, unlabeled Any help would be greatly appreciated! Thanks Another thing I noticed is, when i use gparted to locate my drives, it seems that sda1 is my second drive that I am not detecting when I boot up and my ubuntu + FAT Boot files are installed in sdb1

  Read the article

• Does extra hard drive cache make a difference for streaming video?

  - by johnny

  I am looking at the following two drives for a RAID device, which will be streaming normal things but also a lot of video: Seagate Constellation ES.3 ST4000NM0033 - hard drive - 4 TB - SATA-600 TOSHIBA DT01ACA300 3TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Will the 128 MB cache on the Seagate have an effect in my described scenario, compared to the 64 MB on the Toshiba? If so, what sort of difference can I expect? I'm using a qnap device, if that matters.

  Read the article

• Plex Media Server: Won't find media External Hard Drive

  - by grayed01

  I am attempting to turn an older PC into a home media server with Ubuntu 12.04 using Plex Media Server. I have a newer WD 2 TB external USB HD with all of my media on it. I can not for the life of me figure out why Plex will not recognize the files on this hard drive. It shows the external as there, Ubuntu shows the files and allows me to play them, view them, etc. Plex shows the name "External". But when I click it, it is 100% empty and shows nothing to add. I can access the files on the external through file sharing just fine, on my windows computers but would love to be able to use Plex for streaming with our Roku. I am fairly new to Ubuntu, I have used Plex with the same HD on Windows and it worked fine. I have read multiple articles on this and nothing seems to be doing the trick. How can I solve this?

  Read the article

• Help With Hard links And Symlinks Moving Directory And Files

  - by Julio

  This is what I would like to do. I have a symlink "/var" linking to "/tmpfs/var.1" /var - /tmpfs/var.1 I start a script called "cache_tmpfs" from /etc/rc.local on startup this script will copy /var.backup/* contents to /tmpfs/var.1/ cp -dpRxf /var.backup/* /tmpfs/var.1/ now the problem is that kernel is opening messages log file in /var/log/messages, is it possible to remove the current /var symlink and recreate a new one (that will symlink to /var.backup insteed of /tmpfs/var.1) without issues as files once opened by system become hard links?? rm /var && ln -s /var.backup /var Thanks...

  Read the article

• Need Help Changing Owner of External HArd Drive

  - by Thomas Ballew

  My understanding of code is about zero. I can open a terminal window, and type commands that are given to me, but that's about it. If someone can help me with this question, and explain at a level I'm likely to understand, thanks. If not, thanks anyway. I have an external hard drive with two partitions. I bought this drive when my operating system was Apple, 10.5 or so, and it was formatted as HFS+ with that system. Now, connecting the HD to my Linux system, I can read files, but I have about 1.5 TB of space that I can't use, because I am not the owner of the file, so can't write to the HD. Short of reformatting the HD, is there a way for me to set the permissions for the HD so I can write to it? Again, thank you.

  Read the article

• Ubuntu installer doesn't see internal hard drive on DELL Vostro 3360

  - by valk

  I just received a new DELL Vostro 3360, it has Windows 7 preinstalled. When it comes to the partition window I can't see the hard drive there. I see only /dev/sda or /dev/sdb (either one and in both cases it's a usb drive from which I'm installing). I tried every imaginable BIOS configuration. Tried to change the SATA mode to ATA, DHCI and more. EDIT: I tried to install with standard Ubuntu 12.04 32 bit, and 11.10 64 bit official versions. No luck. I'll appreciate any suggestion.

  Read the article

• External USB hard drive makes noises when the computer is turned off

  - by Amir Adar

  I have an external USB hard drive of 500GB. I can't tell what model it is exactly, as nothing specific is written on it and I don't have the box anymore. I use it as a backup disk. It works absolutely fine when the computer is turned on: no problems with writing or reading, and everything is done in dead silence. However, if I turn the computer off and the disk is still connected, it stays on and makes clicking noises. For that reason I only connect it when I need to back up or restore. Does that mean there's a problem with the disk, or with some preferences in the system itself? Or something else?

  Read the article

• Unable to mount hard disk

  - by user101522

  I am unable to mount hard disk and got this message: Unable to mount 158 GB Filesystem Error mounting: mount: wrong fs type, bad option, bad superblock on /dev/sda1, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so From the terminal, I tried syslog - try: No command 'syslog' found, did you mean: Command 'dsyslog' from package 'dsyslog' (universe) Command 'syslogd' from package 'sysklogd' (universe) Command 'syslogd' from package 'inetutils-syslogd' (universe) Command 'syslogd' from package 'busybox-syslogd' (universe) syslog: command not found Also tried dmesg | tail: [ 971.390588] sd 0:0:0:0: [sda] CDB: Read(10): 28 00 12 62 30 80 00 00 40 00 [ 971.390600] end_request: I/O error, dev sda, sector 308424832 [ 971.390605] Read-error on swap-device (8:0:308424840) [ 971.390608] Read-error on swap-device (8:0:308424848) [ 971.390617] Read-error on swap-device (8:0:308424856) [ 971.390620] Read-error on swap-device (8:0:308424864) [ 971.390623] Read-error on swap-device (8:0:308424872) [ 971.390626] Read-error on swap-device (8:0:308424880) [ 971.390629] Read-error on swap-device (8:0:308424888) [ 971.390632] Read-error on swap-device (8:0:308424896) It was fine before I tried to re-install 12.04 from the live CD (which failed due to the disk problem).

  Read the article

• Why is Ubuntu unmounting my primary hard drive?

  - by Twisol

  I'm running Ubuntu 10.10 on my laptop (an Asus G73j), dual-booting Windows 7 if that matters. After using the computer for couple of hours or so, I get a popup complaining that a file was unmounted, then my GNOME desktop panels disappear. I can't save any unsaved work (the file browser shows "Filesystem" as totally empty), and other programs break in odd ways (like Chrome can't browse to any new pages, but keeps current ones going... at least I still have Pandora to listen to when this happens!). I've tried looking in the system logs to no avail; I'm assuming that it can't write any errors to the logs because, of course, the logs are on the primary hard drives. This started happening maybe a few days ago. Yesterday I upgraded from 10.4, but I believe it was happening before then. Any advice for figuring this out?

  Read the article

• can't see second hard drive

  - by Todd K

  I had XP Pro installed, and then I installed 12.04 dual boot. System has 2 hard drives, c: (as in windows) is primarily OS stuff, and then E: is data/personal documents. XP can still see both drives as normal after the ubuntu install, but ubuntu can only see the windows C: drive. How can I access the second drive? I can't see any trace of it, using the little *nix know-how I have, which isn't much...any help is great! Thanks!

  Read the article

< Previous Page | 1 2 3 4 5 6 7 8 9 10 11 12  | Next Page >