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• Can NP-Intermediate exist if P = NP?

  - by Jason Baker

  My understanding is that Ladner's theorem is basically this: P != NP implies that there exists a set NPI where NPI is not in P and NPI is not NP-complete What happens to this theorem if we assume that P = NP rather than P != NP? We know that if NP Intermediate doesn't exist, then P = NP. But can NP Intermediate exist if P = NP?

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• Hard drive mounted at / , duplicate mounted hard drive after using MountManager

  - by HellHarvest

  possible duplicate post I'm running 12.04 64bit. My system is a dual boot for both Ubuntu and Windows7. Both operating systems are sharing the drive named "Elements". My volume named "Elements" is a 1TB SATA NTFS hard drive that shows up twice in the side bar in nautilus. One of the icons is functional and even has the convenient "eject" icon…

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• Best book regarding NP-hard, NP-complete, P =? NP

  - by RMMMM

  What is the best book for a student learning about concepts such as NP-hard, NP-complete and P=?NP? I've already got the CLR but it doesn't really cover these particular topics as thoroughly.

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• Will Windows fail activation on a new hard drive after previous hard drive failed

  - by ServerBloke

  I have a failing hard drive which won't boot, that has Windows 7 Home Premium installed. I have a replacement hard drive on the way. My question is will I run into problems trying to install Windows 7 using the same cdkey and DVD on the new hard drive? I assume activation will find that the cdkey has already been activated and fail, especially if…

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• Connect a 2.5" (laptop hard disk) SATA hard disk to Desktop PC

  - by Lawliet

  Can I connect a laptop SATA hard disk to Desktop PC? Do I have to use some adapters or I can just plug in SATA power connector and SATA data cable like my Desktop hard disk is connected? I noticed that both laptop and desktop SATA disks use same connectors, but I'm afraid that I might fry my laptop hard disk because the SATA connector has both…

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• Connect a 2.5" (laptop hard disk) SATA hard disk to Desktop PC

  - by Lawliet

  Can I connect a laptop SATA hard disk to Desktop PC? Do I have to use some adapters or I can just plug in SATA power connector and SATA data cable like my Desktop hard disk is connected? I noticed that both laptop and desktop SATA disks use same connectors, but I'm afraid that I might fry my laptop hard disk because the SATA connector has both…

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• Use hard disk image like a regular hard disk on Linux

  - by jobnoorman

  If you have a hard disk image (including partition table, multiple partitions,...), is it possible to let Linux treat it as a regular hard disk? By "regular hard disk" I mean I would like to have the image show up as, for instance, /dev/hdx and its partitions as /dev/hdx1,... (I know I can mount one of the partitions in the image using "mount…

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• Repairing hard disk when Windows installation disk won't boot

  - by Echows

  I'm trying to recover some data from a faulty hard disk with Windows installed on it (on which Windows won't even boot). I have tried so far: Booting to Ubuntu live USB stick and running ntfsfix (didn't work) Trying to mount the broken partition when running Ubuntu from usb stick (doesn't mount) Running photorec image recovery tool from live…

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• Will a higher hard drive size affect performance

  - by user273010

  My laptop came with a 500 GB hard drive. I use my laptop for storing my digital photographs, and only have about 14 GB of file storage left on the original hard drive. I have a 750 GB external hard drive, but am leery of relying on it for primary storage as I tend to knock things over and it has already crashed once and I lost a lot of the…

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• Corrupt file indicative of corrupt hard drive?

  - by Elipsicon

  I have noticed that two files on my (almost full) 2 TB hard drive have been corrupted. One file has 20 kB (!) corrupted, i.e. consecutive 20 kB have changed, even though the modification date of the file hasn't changed and I haven't worked with this file for over a year. This tells me that something "below" the file system level has messed…

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• External hard drive doesn't appear in Computer

  - by Thomas Clayson

  I cannot work out why this is happening. I have an external hard drive (which is an old laptop hard drive with an IDE to USB adapter). Plugging it into my computer powers it up. It spins correctly and the lights on the adapter flash normally. Uninstalling from hardware manager and plugging it back in causes Windows to "install new…

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• Do I need to replace my hard disk?

  - by Sneha Kamath

  Hello everyone. Whenever I start my computer Ubuntu pops up the following error: A hard disk may be failing one or more hard disk report health problems A friend of mine ran some test and it was found that my hard disk has 74 bad sectors. Is this merely a software issue that will be solved after a complete format of my hard…

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• Fedora 11 System - Failed Hard Drive Removed, and Boot gets GRUB Hard Disk Error

  - by Mindful

  Greetings, I have a machine with a 120GB ATA drive that has what I thought to be non-essential data on it. I also have a 320GB SATA hard drive with the OS/Application/Files (good data I want to keep). My 120GB ATA is failing I believe, as my computer kept slowing to a halt. However, when I move the drive from BIOS my computer…

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• Can't Read/Write the Hard disk used in NAS

  - by mgpyone

  I've lately purchased a Synology DS212j and I intended to use my two 3.5" HDs into it. One of them was in used as an external HD. Thus when I install these two unit in NAS, it asked me to formatted in order to used with its format (I think it's ext3?) . I installed the Disks and omit the formatting option. I just got another…

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• Hard drive failed, suspected filesystem corruption, still cannot salvage any data from harddrive

  - by Hippy-Head

  Firstly, I am terribly sorry if this is a duplicate, but I couldn't find a similar issue to mine, so here goes. I have a 1TB hdd bought around 8 months ago used as backup hard drive. I have not used the drive for a period of time whatsoever, and when I was trying to get back to some files on it, it was completely wiped just…

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• Force spin-down of external hard-drive on linux (raspberry pi)

  - by user258346

  I'm currently setting up a home-server using a Raspberry Pi with an external hard-disk connected via usb. However, my hard-drive will never spin down when being idle. I tried already the hints provided at raspberrypi.org ... without any success. 1.) sudo hdparm -S5 /dev/sda returns /dev/sda: setting standby to 5 (25…

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• Using an ATA-100 Hard Drive with a Thermaltake BlacX External Hard Drive Dock

  - by Joe

  Is it possible for a Thermaltake BlacX HDD Dock to connect to and recognize an ATA-100 Hard Drive? I know that the specifications for the BlacX say that it only supports SATA & SATAII, but I was hoping for one of three things: 1) for it to still work even though it isn't supported 2) for there to be some sort of…

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• Using an ATA-100 Hard Drive with a Thermaltake BlacX External Hard Drive Dock

  - by Joe

  Is it possible for a Thermaltake BlacX HDD Dock to connect to and recognize an ATA-100 Hard Drive? I know that the specifications for the BlacX say that it only supports SATA & SATAII, but I was hoping for one of three things: 1) for it to still work even though it isn't supported 2) for there to be some sort of…

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• Does vertical position affect hard drive?

  - by yoosiba

  Hey. Recently I noticed that for many small PC cases hard drives are installed in vertical position while in midi tower and all bigger they are in horizontal position. What impact on hdd (non SSD, just plain hdd with all mechanical parts inside) has vertical position/ Does it decrease life of hdd? Is it more prone…

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• Move smaller hard drive to partition on a larger hard drive

  - by bluejeansummer

  My parents bought a new hard drive for a laptop that I've owned for several years. It's much larger than the current one, so I plan on splitting it up to dual boot it with Ubuntu. I have no problem with partitioning a drive (I always keep a LiveCD handy), but my question is this: how can I go about moving the…

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• Checksum Errors From Hard Disk

  - by Ademos

  After running GSmartControl, I received three checksum errors on my storage hard disk. Error in Attribute Data structure: checksum error Error in Attribute Thresholds structure: checksum error Error in ATA Error Log structure: checksum error Does this indicate a hard disk failure? …

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• 2 Hard Drives.One Partition

  - by Nick

  I have two hard drives (One 500 GB and the other 750 GB). I would like to create a single partition which will include these 2 hard drives. I guess it works only with identical hard drives, correct me if I am wrong. I have these 2 drives at an old computer which I tuned and may turn it into a web…

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• Why is numpy's einsum faster than numpy's built in functions?

  - by Ophion

  Lets start with three arrays of dtype=np.double. Timings are performed on a intel CPU using numpy 1.7.1 compiled with icc and linked to intel's mkl. A AMD cpu with numpy 1.6.1 compiled with gcc without mkl was also used to verify the timings. Please note the timings scale nearly linearly with system…

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• Restoring a hard drive

  - by Indian

  I had a laptop on which there was an AMD X2 display card. Suddenly this laptop went kaput. Incidentally the hard drive was safe. I had checked it using another machine. Further, I got this hard drive covered using an external USB HDD case. One day, while sleeping, this case fell down and since…

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• Switch new hard drive with old hard drive (containing files)

  - by jeffmangum

  So my old pc is dead. I took off the HDD cause my files are in there. I have this new pc but the hdd is only 80gb. There are no important files in there so i can just throw it away. I want to switch it with my old HDD. But: I cant just plug in the old hdd to my new pc right? If not, how can…

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