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  • Can't boot after Deleted System Reserved Partition

    - by mauris
    I accidentally deleted the System Reserved Partition and now I can no longer boot into Windows 7. The installation of Windows and all my files still exists in the partition, but without the System Reserved Partition I can no longer boot. After I deleted the System Reserved Partition I moved left the primary partition to fill the space. Is there any way I can "reinstall" that System Reserved Partition and the boot files? PS: I only have Windows 7 installed. No dual-boot nothing.

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  • Partition table damaged

    - by emaster70
    Hello, I'm currently in a terrible situation with my hdd: I was trying to install an OS side by side with my windows 7 x64 and I used the Paragon Partition Manager feature made for that. It disabled/hid/(damaged?) one of my partitions and now I can no longer access it. The partition, unfortunately, contains data I need to access urgently and I've got no backup. To complicate things even further I don't have another PC (I'm writing this msg from my iphone) and all I can rely on is a backtrac 4 disk (wkn't connect to my wifi, gets stuck obtaining IP address) and. Windows 7 x64 disk. Booting into windows fails with the pc hanging on the starting windows screen. Safe mode won't work either. Is there anything I can do? Here's the layout of the disk: Recovery partition Win partition Unallocated space (it's supposed to be my data partition) Other os partition (don't care about that, the installation of the other OS failed) Please help me, I'm desperate.

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  • Partition Wise Joins II

    - by jean-pierre.dijcks
    One of the things that I did not talk about in the initial partition wise join post was the effect it has on resource allocation on the database server. When Oracle applies a different join method - e.g. not PWJ - what you will see in SQL Monitor (in Enterprise Manager) or in an Explain Plan is a set of producers and a set of consumers. The producers scan the tables in the the join. If there are two tables the producers first scan one table, then the other. The producers thus provide data to the consumers, and when the consumers have the data from both scans they do the join and give the data to the query coordinator. Now that behavior means that if you choose a degree of parallelism of 4 to run such query with, Oracle will allocate 8 parallel processes. Of these 8 processes 4 are producers and 4 are consumers. The consumers only actually do work once the producers are fully done with scanning both sides of the join. In the plan above you can see that the producers access table SALES [line 11] and then do a PX SEND [line 9]. That is the producer set of processes working. The consumers receive that data [line 8] and twiddle their thumbs while the producers go on and scan CUSTOMERS. The producers send that data to the consumer indicated by PX SEND [line 5]. After receiving that data [line 4] the consumers do the actual join [line 3] and give the data to the QC [line 2]. BTW, the myth that you see twice the number of processes due to the setting PARALLEL_THREADS_PER_CPU=2 is obviously not true. The above is why you will see 2 times the processes of the DOP. In a PWJ plan the consumers are not present. Instead of producing rows and giving those to different processes, a PWJ only uses a single set of processes. Each process reads its piece of the join across the two tables and performs the join. The plan here is notably different from the initial plan. First of all the hash join is done right on top of both table scans [line 8]. This query is a little more complex than the previous so there is a bit of noise above that bit of info, but for this post, lets ignore that (sort stuff). The important piece here is that the PWJ plan typically will be faster and from a PX process number / resources typically cheaper. You may want to look out for those plans and try to get those to appear a lot... CREDITS: credits for the plans and some of the info on the plans go to Maria, as she actually produced these plans and is the expert on plans in general... You can see her talk about explaining the explain plan and other optimizer stuff over here: ODTUG in Washington DC, June 27 - July 1 On the Optimizer blog At OpenWorld in San Francisco, September 19 - 23 Happy joining and hope to see you all at ODTUG and OOW...

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  • "unbound identifier" errors in scheme

    - by user186909
    Hello: I'm using drscheme from: http://www.archlinux.org/packages/extra/x86_64/drscheme/ I'm trying to work with the sample code in my textbook, but I keep getting getting "unbound identifier" errors. Is it because the scheme interpreter is not configured correctly? or is the code just plain wrong? Here are a few examples: Input: #lang scheme (define (equalimp lis1 lis2) (COND ((NULL? lis1) (NULL? lis2)) ((NULL? lis2) '()) ((EQ? (CAR lis1) (CAR lis2)) (equalimp (CDR lis1) (CDR lis2))) (ELSE '()) )) Output: Welcome to DrScheme, version 4.2.5 [3m]. Language: scheme; memory limit: 128 MB. expand: unbound identifier in module in: COND Input: #lang scheme (define (quadratic_roots a b c) (LET ( (root_part_over_2a (/ (SQRT (- (* b b) (* 4 a c))) (* 2 a))) (minus_b_over_2a (/ (- 0 b) (* 2 a))) ) (DISPLAY (+ minus_b_over_2a root_part_over_2a)) (NEWLINE) (DISPLAY (- minus_b_over_2a root_part_over_2a)) )) Output: expand: unbound identifier in module in: LET Note: I tried using LET* because I read this: stackoverflow.com/ questions/946050/using-let-in-scheme but it produces the same error. Thanks !

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  • Help in recovering partition

    - by goshopedero
    Okay so i had one NTFS partition and i wanted to resize it, but while resizing it with partition magic some error occurred and now i am not able to enter in my partition anymore. I have slackware 13 also and i tried mounting the partition from there but it didn't succeed. One friend of mine came to my house with some live-cd os called backtrack3 and when he booted from cd, he was able to mount the damaged partition - and was able to read/write on it anywhere. I saw my files, they are all there, so nothing's erased just the partition is somehow damaged. But strange thing was that from backtrack we weren't able to mount some of the working partitions of my comp, and we could mount the damaged one. So i am asking for some help here: My files are all there, and i saw them from backtrack. What can i do to fix the partition so it would be usable from windows/slackware again ? Please tell me anything you've got because i have some important data on it. Thank you.

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  • How do I define functions using PLT Scheme macros?

    - by nickname
    I am trying to write a macro that defines a special class of data structure with associated functions. I know this is possible; it is done multiple times in the core language itself. As a specific example, how would I define the define-struct macro in Scheme itself. It needs to create make-struct, struct-<<field>>, etc functions. I tried doing this using define, however, this only defines the function in the macro's lexical scope. How can I actually define a function in a macro?

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  • How do I use Declarations (type, inline, optimize) in Scheme?

    - by kunjaan
    How do I declare the types of the parameters in order to circumvent type checking? How do I optimize the speed to tell the compiler to run the function as fast as possible like (optimize speed (safety 0))? How do I make an inline function in Scheme? How do I use an unboxed representation of a data object? And finally are any of these important or necessary? Can I depend on my compiler to make these optimizations? thanks, kunjaan.

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  • Recover an HP recovery partition from an offline drive

    - by eric.chartier
    I have a (semi)-dead hard drive with an HP recovery partition on it. My goal is to 1-Buy a new hard drive (checked) 2-Copy the recovery partition to a drive ( dd if=/dev/sdb1 of=~/recovery.bak ) 3-Make a new partition of 12000 mb with Windows 7 4-Copy back recovery partition to the new drive ( dd if=~/recovery.bak of=/dev/sdb1 ) Then press F11 when the laptop boots however it does NOT work. Any idea why? It seemed quite fool proof...

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  • Copying Windows 7 system onto Mac Pro partition?

    - by BEATFROMBRAIN
    Instead of installing a new Windows 7 system onto a mac pro partition, is it possible to copy over my complete Windows 7 system directly onto the partition, and get it to run? I just bought the mac pro, and it's running OSX 10.6... Copied from a comment: I wish to make a windows partition on the mac pro startup disk, but instead of installing windows, was wondering if I can copy over from my pc laptop byte for byte my windows system into said partition, and successfully run it

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  • Cannot assign a letter to a FAT32 partition

    - by Toc
    I have an external hard disk where I have created many partitions to use also in Linux. First two partitions are FAT32. The third is a Truecrypt partition. I cannot assign a letter to the second partition. When I go to Manage disk and right-click on the unassigned partition, most of the options are not enabled. What have I to do to see this partition on my XP PC?

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  • Transform a NTFS partition type into EISA

    - by doug
    hi there Some time ago I've installed windows 7 on my laptop which has a EISA partition with MS Vista. I really don't remember what I did(I'm silly i Know) but now, that EISA partition has NTFS type but is also hidden. Does anyone knows how can I make that NTFS partition into a EISA partition type, as it was build when I've buyed the laptop? TY

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  • XP: cannot assign a letter to a FAT32 partition

    - by Toc
    I have an external hard disk, where I have created many partitions to use also in Linux. The first two partitions are FAT32. The third is a Truecrypt Partition. I cannot assign a letter to the second partition. When I go to Manage disk and make right clic on the unassigned partition, most of the items are not enables. See screenshot: http://i42.tinypic.com/ofsh9u.jpg What have I to do to see this partition on my XP pc?

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  • Writing an auto-memoizer in Scheme. Help with macro and a wrapper.

    - by kunjaan
    I am facing a couple of problems while writing an auto-memoizer in Scheme. I have a working memoizer function, which creats a hash table and checks if the value is already computed. If it has been computed before then it returns the value else it calls the function. (define (memoizer fun) (let ((a-table (make-hash))) (?(n) (define false-if-fail (?() #f)) (let ((return-val (hash-ref a-table n false-if-fail))) (if return-val return-val (begin (hash-set! a-table n (fun n)) (hash-ref a-table n))))))) Now I want to create a memoize-wrapper function like this: (define (memoize-wrapper function) (set! function (memoizer function))) And hopefully create a macro called def-memo which defines the function with the memoize-wrapper. eg. the macro could expand to (memoizer (define function-name arguments body ...) or something like that. So that I should be able to do : (def-memo (factorial n) (cond ((= n 1) 1) (else (* n (factorial (- n 1)))))) which should create a memoized version of the factorial instead of the normal slow one. My problem is that the The memoize-wrapper is not working properly, it doesnt call the memoized function but the original function. I have no idea how to write a define inside of the macro. How do I make sure that I can get variable lenght arguments and variable length body? How do I then define the function and wrap it around with the memoizer? Thanks a lot.

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  • solve a partition misalignment?

    - by learner
    I have a new Dell XPS laptop which had Windows 7 installed in it. It also had a default extra partition for "Dell Utility". I installed Ubuntu in it on an Extended Partition along with windows and specified the logical partitions myself (for /,/home and swap). Now when I open Disk Utility , it shows this "Partition misaligned by 512 bytes" error for the Dell Utility partition and "Partition misaligned by 1024 bytes" for the entire Extended partition where Ubuntu is installed. Deleting the extended partition and re-installing Ubuntu may solve the problem of misalignment in the extended partition. But how about the Dell Utility partition? If I re-install Windows 7 Dell Utility wouldn't be a part of the re-install. So that may not solve it either. How do I fix this? Note: The extended partition I made contains an NTFS logical partition for holding data accessible by both OSes(basically a personal data partition). EDIT: I deleted all my Ubuntu partitions and re-installed Ubuntu like before,this time making them partitions with GParted via LiveCD. Now the only problem is that there is a misalignment in the Dell Utility partition. The other misalignment got fixed. Now how do I get rid of that issue?

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  • Mount a LUKS partition at boot

    - by Adam Matan
    Hi, I have installed an Ubuntu machine with two encrypted LUKS partitions: one for / and one for /home. I've reinstalled the machine to upgrade to 10.04. Again, the / is installed using LUKS, and I'm able to mount the /home using: mkdir /media/home sudo cryptsetup luksOpen /dev/sda2 home sudo mount -t ext3 /dev/mapper/home /media/home The problem is, this cryptfs mapper disappears after boot, so I putting the appropriate line in fstab fails. How do I set the cryptfs to prompt for password and unlock the drive at boot? Thanks, Adam

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  • Scheme vs Haskell for an Introduction to Functional Programming?

    - by haziz
    I am comfortable with programming in C and C#, and will explore C++ in the future. I may be interested in exploring functional programming as a different programming paradigm. I am doing this for fun, my job does not involve computer programming, and am somewhat inspired by the use of functional programming, taught fairly early, in computer science courses in college. Lambda calculus is certainly beyond my mathematical abilities, but I think I can handle functional programming. Which of Haskell or Scheme would serve as a good intro to functional programming? I use emacs as my text editor and would like to be able to configure it more easily in the future which would entail learning Emacs Lisp. My understanding, however, is that Emacs Lisp is fairly different from Scheme and is also more procedural as opposed to functional. I would likely be using "The Little Schemer" book, which I have already bought, if I pursue Scheme (seems to me a little weird from my limited leafing through it). Or would use the "Learn You a Haskell for Great Good" if I pursue Haskell. I would also watch the Intro to Haskell videos by Dr Erik Meijer on Channel 9. Any suggestions, feedback or input appreciated. Thanks. P.S. BTW I also have access to F# since I have Visual Studio 2010 which I use for C# development, but I don't think that should be my main criteria for selecting a language.

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  • Backup Linux Root Partition (Fedora 12)

    - by SomeNewbie
    I setup my partition scheme to have an extra partition the size of my / partion. I have a separate home directory partition. Essentially, I will be doing things that might make my OS unstable so I'd like to backup the OS state but without bothering my home directory. Can I just backup (maybe with dd?) my root partition to another partition on the HDD? I know to restore it I would have to boot up with a livecd or something and do the reverse procedure. I want this to be as simple and require the least amount of external hardware as possible.

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  • "EISA Configuration" partition

    - by jpbochi
    I have a new Alienware M17x running Vista x64. I just found out that it came with a misterious "EISA Configuration" partition. On Disk Management, my Disk 0 tells me that my HD has about 300 GB. The EISA partition has 12 GB. That's big enough to know why is it there. So, this is more of a bundle question. What is this "EISA Configuration" partition? Is it safe to remove it somehow? If so, how can I delete it? I mean join it with the primary partition, or set it as a secondary small partition.

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  • Fix NTFS partition

    - by stolebe
    Okay, so i was about to resize one of my NTFS partitions but suddenly the partition tool showed me an error and it crashed, so i was no longer able to use my partition - even when i tried mounting it under linux it showed me error. I installed active partition recovery, and using it i can see all my files on that partition - it's all there, nothing's been removed. I just need somehow to fix the partition so it can be usable again. Can you tell me how, or using with which tool/software ? Thank you.

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  • Windows cannot access my external harddisk partition but all partition managers can

    - by Ashish
    Some weird problem happened to my Maxtor 500GB external harddisk, it all started when it once freezed during some operation. Now when I insert the drive in a USB slot, Windows asks me to format it, and if I try to open the drive from my computer it says, "not accessible".. I tried most of the major partition managers and partition recovery software. All of these can see and access my partition normally. It showing the free space and used space correctly. But Windows can't. Please help me out. Including a screenshot: On the left side, the partition manager can access and see my data in the corrupted partition, and on the right side Windows can't

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  • Merely chainloading an Acer Recovery Partition deleted all data

    - by WindowsEscapist
    I was starting a backup of Acer's factory restore partition located inside of an extended partition to determine whether or not it still worked. I clicked "take no action" once I saw that it had, in fact, successfully started up. However, when I rebooted, I got an "error: no such partition" and was dropped to a GRUB recovery prompt. Upon further investigation, I discovered that all partitions inside the extended partition were gone except for the recovery partition! What happened? How can I fix this? testdisk doesn't find the deleted partitions!

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  • 1 TB hdd and no space to create a partition for linux !

    - by rangalo
    I have a brand new Acer aspire 5811 with core i5 processor and all that. There is windows 7 Home Premium pre-installed on it. I want to install arch and setup a dual boot system. The problem is: Windows shows 4 partitions 14 MB UNKNOWN recovery partition 100MB NTFS System Reserved partition for Windows 7 448GB NTFS Windows 7 system partition 468GB NTFS Data partition for windows 7 But GpartedLive cd and also arch setup show 5 partitions 938Kb UNKOWN system reserved partition 14 MB UNKNOWN recovery partition 100MB NTFS System Reserved partition for Windows 7 448GB NTFS Windows 7 system partition 468GB unusable space Because of this, I cannot create another primary partition. Can any body guide me about how should I go for creating partition for installing arch ? Note: I need to keep windows 7 working. regards.

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  • Accidentally dd'ed an image to wrong drive / overwrote partition table + NTFS partition start

    - by Kento Locatelli
    I screwed up and set the wrong output for dd when trying to copy a freenas iso, overwriting the wrong external hard drive. Ironically, I was trying to setup a freenas server for data backup... External drive is only used for data storage, system is entirely intact Drive had a single NTFS partition filing the entire device (2TB WD elements) Drive originally had an MBR partition table. Drive now shows as having a GPT, presumably from the freenas image. Drive was mounted at the time, with maybe a couple kB of data written/read after running dd Drive is just a few months old and healthy (regular SMART / fs checks) I have not reboot the OS (crunchbang) /proc/partition still holds the correct information (and has been stored) Have dd's output (records in / out / bytes) testdrive did not find any partitions on quick or deep search running photorec to recover the more important data (a couple recent plaintext files that hadn't been backed up yet). Vast majority of disk content ( 80%) is unnecessary media files. My current plan is to let photorec do it's thing, then recreate the mbr with gparted and use cfdisk to create another NTFS partition using the sector information from /sys/block/.../. Is that a good course of action (that is, a chance of success)? Or anything else I should try first? Possibly relevant information: dd if=FreeNAS-8.0.4-RELEASE-p3-x86.iso of=/dev/sdc: 194568+0 records in 194568+0 records out 99618816 bytes (100 MB) copied grep . /sys/block/sdc/sdc*/{start,size}: /sys/block/sdc/sdc1/start:2048 /sys/block/sdc/sdc1/size:3907022848 cat /proc/partitions: major minor #blocks name ** Snipped ** 8 32 1953512448 sdc 8 33 1953511424 sdc1 current fdisk -l output: WARNING: GPT (GUID Partition Table) detected on '/dev/sdc'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sdc: 2000.4 GB, 2000396746752 bytes 255 heads, 63 sectors/track, 243201 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: 0x00000000 Disk /dev/sdc doesn't contain a valid partition table

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