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  • What are the differences between the "generic" and "server" kernel images provided by Ubuntu?

    - by dcrosta
    In particular, I'm wondering if there are any patches or config adjustments made to the disk cache size in the server edition. I'm running on a small system (256M RAM), and would like to experiment with keeping the disk cache size smaller so that there's more memory available for applications. I've found this page at Ubuntu's website, which neither answers my questions nor is about the 9.04 release.

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  • Re-format thumb drive

    - by wizlog
    I was trying to put the Windows 8 Consumer Preview onto a thumb drive, when I was asked if I was OK with wiping it (I said yes I as it was blank). I had to sleep my computer during the wiping, and now I can't do anything with my dive. When I put it into my computer: When I click format disk: In short, the disk never reformats (I get an error message letting me know that Windows was unable to format the drive). Whats going on, and how do I fix it?

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  • Can I boot my notebook via eSata pci-xpress card?

    - by OliverS
    I would like to boot directly from an external hard disk to improve performance over my internal notebook hard disk. My notebook has no native eSata jack but a pci express card. As my BIOS doesn't support the card on boot time so no way directly booting it. My question is, is it possible to work around this issue by using an USB stick or similar with a boot loader like grub and if so, will this only work for Linux or Windows as well?

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  • How do I automatically copy data when attaching external storage?

    - by Iceking007
    If I am correct to assume that once I place a DVD/disk in my optical drive (or use a USB flash drive or external HDD for that matter; for arguments sake) that this action would in effect trigger an 'event' in Windows. I would like to use this 'triggered event' to enable an entire copy of that device. Example: if my optical H: reads a disk OR the user closes the tray OR ... then xcopy /S H: "F:\Copy of H"

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  • To Run Linux (Ubuntu) on Windows 7, is using Virtual PC one of the best ways?

    - by Jian Lin
    I need to try Linux (Ubuntu) and feel hesitant to install Ubuntu on top of a Win 7 machine to dual boot (might need to use Win7 and Ubuntu at the same time). Is creating a Virtual PC on Win7, and then install the latest Ubuntu on that Virtual PC one of the better option? So I think I can create a Virtual PC with an empty virtual hard disk (vhd), say, for 30GB, and then put in the Ubuntu DVD-R or CD-R to install Ubuntu onto that empty hard disk.

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  • Windows 7 Ultimate files to Iso

    - by user269833
    So i had copied my windows 7 files from an installation disc to a flash disk which i had made bootable to format a mini laptop with no DVD drive, then by mistake broke the installation disc but still have the files in the flash disc, i want to burn them into another disk. Have tried burning them as data but wont work in some systems...so how can i get to create a bootable disc / disc iso image? I rily need help ASAP**

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  • Reinstallation of Ubuntu

    - by Achuthan
    When I tried to re install Ubuntu 11.10, I wanted to erase the existing Ubuntu using gparted editor/ something else icon in Ubuntu. I found it was not detecting any existing partition. Then when I googled and used gparted editor I found it was showing unallocated space of entire hard disk space. However I am able to boot to Ubuntu normally and when I use disk utilities I am able to access and see all partitions. Please help me to solve my issue

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  • Making many network shares appear as one

    - by jimbojw
    Givens: disk is cheap, and there's plenty lying around on various computers around the corporate intranet redundant contiguous large storage volumes are expensive Problem: It would be fantastic to have a single entry point (drive letter, network path) that presents all this space as one contiguous filesystem, effectively abstracting the disk and network architecture from the paths presented to users. Does anyone know how to implement such a solution? I'm open to Windows and non-windows solutions, free and proprietary.

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  • Recovery partition is 'visible' while hidden

    - by jroeleveld
    For some reason the recovery partition of windows is appearing while it is hidden. With hidden I mean hidden in Disk management and Diskpart. This partition causes the screen to flicker sometimes, as it is continuously switching between being visible and hidden. Sometimes however, it is just visible. In the attached screenshots you can see the configuration. Translation: partitie=partition, In orde = OK, Verborgen = hidden, Lokale schijf = local disk, Herstelpartitie = recovery partition

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  • Convert Ubuntu back to windows 8

    - by alex0112
    I recently wiped a windows 8 machine and installed Ubuntu. I now need to sell this machine, and the people I want to sell it to would like it to be running windows 8 again. I've been looking around online, and I was under the impression that I could simply order a recovery disk or a re-install disk or something similar. But I'm getting a lot of different answers. What is the right (legal, cheap, in that order) way to do this?

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  • Create a primary partition on Windows 7

    - by TutorialPoint
    I have windows 7 installed. On the moment i have the following partitions on 1 hard disk: (300 GB) C: (Windows) (Primary, System, Boot, Page File, Crash Dump, Active) 100 GB D: (Data) (Logical) 100 GB E: (System Reserved created after Boot repair) (primary, system) 100 MB Now i want to create a new primary partition on this disk, because i have +/- 100 GB left, for a new OS. However when trying to make a new partition, it makes it a Logical partition, not Primary. How to make it primary...?

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  • Speed up MySQL for inserts (for testing purposes)

    - by Alex N
    I have a bit of software that needs to do a lot of INSERTs. In production environment there'll be some serious tweaking and testing and stuff like that, but now when I need to test it I'd like to speed up inserts as much as possible. Hence my question - is there a way to tweak mysql such that it doesn't do much disk I/O but keeps everything in RAM and syncs with disk rarely(like once n-seconds say?)

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  • SQL Server: Database stuck in "Restoring" state

    - by Ian Boyd
    i backed up a data: BACKUP DATABASE MyDatabase TO DISK = 'MyDatabase.bak' WITH INIT --overwrite existing And then tried to restore it: RESTORE DATABASE MyDatabase FROM DISK = 'MyDatabase.bak' WITH REPLACE --force restore over specified database And now the database is stuck in the restoring state. Some people have theorized that it's because there was no log file in the backup, and it needed to be rolled forward using: RESTORE DATABASE MyDatabase WITH RECOVERY Except that, of course, fails: Msg 4333, Level 16, State 1, Line 1 The database cannot be recovered because the log was not restored. Msg 3013, Level 16, State 1, Line 1 RESTORE DATABASE is terminating abnormally. And exactly what you want in a catastrophic situation is a restore that won't work. The backup contains both a data and log file: RESTORE FILELISTONLY FROM DISK = 'MyDatabase.bak' Logical Name PhysicalName ============= =============== MyDatabase C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\DATA\MyDatabase.mdf MyDatabase_log C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\DATA\MyDatabase_log.LDF

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  • PHP mcrypt usage class?

    - by kavoir.com
    I'm pretty new at this. Tried to make sense of the manual page for mcrypt at PHP.net when I thought a good tutorial would do a better job. So I searched yet without anything substantial. I also tried one of the examples of using mcrypt to perform the encryption and decryption with 2 functions, but it gives a warning of "Size of key is too large for this algorithm". Can anyone please write me a two-way class to do the encryption / decryption using mcrypt so I can make sense of the library? Thanks!

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  • Help make sense of a KillDisk error/log

    - by user284194
    I have a hard drive that I've been trying to reformat. I tried reformatting it in the windows XP and 7 installers, and in an Ubuntu live cd with gparted. I tried using dd to 'zero' the drive as well with no success. Finally I ran across KillDisk after a search. I tried to zero the disk again with KillDisk and after 8 hours of zeroing I get the following errors in the log: ----------------------------------------Erase Session Begin--------------------------------------- 2010-03-23 19:35:54 Active@ KILLDISK for Windows Build 5.1.39 started Target: WDC WD2500KS-00MJB0 232.9 GB Located on: WDC WD2500KS-00MJB0 (Serial number: WD-WCANK9604799) Erase method: One Pass Zeros (1 pass) Passes: 1 Bad (unwritable) sectors detected from 1701 to 488397167 on Hard Disk 1. Error (the handle is invalid) refreshing device Hard Disk 1. Error (the handle is invalid) reading sector 0 on 81h. 2010-03-24 02:28:25 Total number of erased device(s): 0, partition(s): 0 -----------------------------------------Erase Session End---------------------------------------- Is the drive dead?

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  • how can I translate a NSString to NSData? And the data has the same content as the string

    - by someonemaybe
    NSString * theString=@"e88d"; NSData * data; // something I should implement NSLog(@"%@", theString); NSLog(@"%@",[data description]); I want the results of the two printings are the same. AES encryption and decryption: (1).The server: if the plaintext is :@"abcd"; the AES encrypted data(NSData data type) is :"d882830c dc892036 4345839f 13c7516a"; (2).in my local app, my code is : NSData*data=[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://..."]]; NSString * mystring= [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; However, to decrypt data successfully, I must got a data(NSData date type) which equals to "d882830c dc892036 4345839f 13c7516a".But it is the mystring (NSString data type) not the data(NSData data type) that equals to the right value. the encryption and decryption function both need a data(NSData data type) as input datas. (NSData*)AES128EncryptWithKey:(NSString*)key; (NSData*)AES128DecryptWithKey:(NSString*)key;

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  • How are interrupts handled by dual processor machines?

    - by jeffD
    I have an idea of how interrupts are handled by a dual core CPU. I was wondering about how interrupt handling is implemented on a board with more than one physical processor. Is any of the interrupt responsibility determined by the physical board's configuration? Each processor must be able to handle some types of interrupts, like disk I/O. Unless there is some circuitry to manage and dispatch interrupts to the appropriate processor? My guess is that the scheme must be processor neutral, so that any processor and core can run the interrupt handler. If a core is waiting on a disk read, will that core be the one to run the interrupt handler when the disk is ready?

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  • Alternative to udev functionality on OSX

    - by S1syphus
    I'm trying to create a custom file/check in check out script for external hardrives, however part of the script is from a Linux machine, which I have tested works fine, but uses udevinfo, OS X doesn't have udev, so is there anything that offers the same functionality? #!/bin/bash declare -a EXTERNAL_DISKS declare -a INTERNAL_DISKS for disk in /dev/[sh]d[a-z]; do eval `udevinfo -q env -n $disk` [ "$ID_BUS" = "usb" ] && EXTERNAL_DISKS=( ${EXTERNAL_DISKS[@]} $disk ) [ "$ID_BUS" = "scsi" ] && INTERNAL_DISKS=( ${INTERNAL_DISKS[@]} $disk ) done echo "Internal disks: ${INTERNAL_DISKS[@]}" echo "External disks: ${EXTERNAL_DISKS[@]}" Anybody know any alternatives? Or a way this could be accomplished on OSX using bash?

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  • Detect block size for quota in Linux

    - by Chen Levy
    The limit placed on disk quota in Linux is counted in blocks. However, I found no reliable way to determine the block size. Tutorials I found refer to block size as 512 bytes, and sometimes as 1024 bytes. I got confused reading a post on LinuxForum.org for what a block size really means. So I tried to find that meaning in the context of quota. I found a "Determine the block size on hard disk filesystem for disk quota" tip on NixCraft, that suggested the command: dumpe2fs /dev/sdXN | grep -i 'Block size' or blockdev --getbsz /dev/sdXN But on my system those commands returned 4096, and when I checked the real quota block size on the same system, I got a block size of 1024 bytes. Is there a scriptable way to determine the quota block size on a device, short of creating a known sized file, and checking it's quota usage?

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  • Perl - Internal File (create and execute)

    - by drewrockshard
    I have a quick question about creating files with perl and executing them. I wanted to know if it was possible to generate a file using perl (I actually need a .bat script) and then execute this file internally to the program. I know I can create files, and I have with perl, however, I'm wanting to do this internally to the program. So, what I want it to do is actually create a batch script internally to the program (no file is actually written to the disk, everything remains in memory, or the perl program), and then once it completes the writing of the file, I'd like to be able to actually execute this file, and then discard the file it just wrote. I'm basically trying to have it create a batch script on the fly, so that I can just have output text files from the output of the script, rather than creating the batch script on disk, then executing it, and then deleting the batch file from disk when its done. Can this be done and how would I go about doing this? Regards, Drew

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  • System.Security.Cryptography.CryptographicException: Length of the data to decrypt is invalid Error

    - by EdA
    I used the code on http://www.obviex.com/samples/Encryption.aspx for encryption/decryption. I was successful in creating a simple test to functionality encrypt and decrypt data. However, I keep on getting the following error when I test the decrypt function that is used from the Accounts Controller. I am thinking it either has to do with the Machine Code within the Web.config or the the last byte not getting read by the decrypt code. Error: "Length of the data to decrypt is invalid" Note: I tried the padding fix I found on the internet and that did not work. Thanks in advance.

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  • how to convert byte array to key format??

    - by sebby_zml
    hi everyone, i would like to know how to convert byte array into key. i am doing an AES encryption/decryption. instead of generating a key, i would like to use my generated byte array. byte[] clientCK = Milenage.f3(sharedSecret16, RANDbytes, opc); let say i have a byte array called clientCK, stated above. i want to use it in AES encryption as shown below. Cipher c = Cipher.getInstance("AES"); c.init(Cipher.ENCRYPT_MODE, key); byte[] encValue = c.doFinal(valueToEnc.getBytes()); String encryptedValue = new BASE64Encoder().encode(encValue); therefore, i need to convert that byte array clientCK into key format. please help.

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  • How can I retain carriage returns when I'm encrypting data?

    - by William Calleja
    I have this following setup, a textarea named with some data in it that may have carriage returns and another textarea that has style='display:none' in order to make it hidden as follows: <textarea id="myTextarea" onBlur="encryptMyData()"></textarea> <textarea name="encryptedText" style='display:none'></textarea> the user enters data in the first textarea and when that text area loses focus the 'encryptMyData()' javascript function is calling an ajax call to take whatever the user entered in the first textfield, encrypt it using rijndael, and paste it in the encryptedText textarea so that it is stored in the database later. Now what I need to do is this, find a way to convert the carriage returns before encryption to a tag like so [cr] so that when I retrieve the data, all formatting is retained. Any idea how I do this? I'm using asp.net and c# to perform the encryption.

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