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• blurry lines between web application context layer, service layer and data access layer in spring

  - by thenaglecode

  I Originally asked this question in SO but on advice I have moved the question here... I'll admit I'm a spring newbie, but you can correct me if I'm wrong, this one liner looks kinda fishy in a best practices sort of way: @RepositoryRestResource(collectionResourceRel="people"...) public interface PersonRepository extends PagingAndSortingRepository<Person, Long> For those who are unaware, the following does many things: It is an interface definition that can be registered in an application context as a jpa repository, automagically hooking up all the default CRUD operations within a persistence context (that is externally configured). and also configures default controller/request-mapping/handler functionality at the namespace "/people" relative to your configured dispatcher servlet-mapping. Here's my point. I just crossed 3 conceptual layers with one line of code! this feels against my seperation-of-concern instincts but i wanted to hear your opinion. And for the sake of being on a question and answer site, I would like to know whether there is a better way of seperating these different layers - Service, Data, Controllers - whilst maintaining as minimal configuration as possible

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• Creating a layer of abstraction over the ORM layer

  - by Daok

  I believe that if you have your repositories use an ORM that it's already enough abstracted from the database. However, where I am working now, someone believe that we should have a layer that abstract the ORM in case that we would like to change the ORM later. Is it really necessary or it's simply a lot of over head to create a layer that will work on many ORM? Edit Just to give more detail: We have POCO class and Entity Class that are mapped with AutoMapper. Entity class are used by the Repository layer. The repository layer then use the additional layer of abstraction to communicate with Entity Framework. The business layer has in no way a direct access to Entity Framework. Even without the additional layer of abstraction over the ORM, this one need to use the service layer that user the repository layer. In both case, the business layer is totally separated from the ORM. The main argument is to be able to change ORM in the future. Since it's really localized inside the Repository layer, to me, it's already well separated and I do not see why an additional layer of abstraction is required to have a "quality" code.

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• Corrupted File System on Dual HD/Dual Boot System

  - by Troy

  I have the following system set up: 2 drives, 1 TB each, one with Windows 7 and the other with what used to be Ubuntu 11.x After an update my system became corrupted and now the file system is apparently corrupt. The Ubuntu drive is /dev/sda2, the Windows 7 is /dev/sda1. I've tried fsck /dev/sda2 -t ext3 and that does nothing. I'm not sure what to do at this point. I don't even mind wiping the /dev/sda2 drive clean, so it will at least accept a completely new installation of Ubuntu. I just don't know how to do that. Please help. Thank you

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• Dual Boot, Dual Hard Drives!

  - by Mars

  I'm posting this question after reading most of similar ones. My situation is different here in the fact that I'm installing on SSD and not partitioning my HDD, and that I can actually boot! I'm just looking to improve the convenience of having easier way to choose. 1- I have a Dell Inspiron 15R SE. It has HDD (1TB) and SSD (32GB). I managed to do whatever things I did in distant past to set the SSD free (I don't really care how fast my system boots). Now I wanted to install Linux on the SSD and leave the HDD untouched. It's way too precious for me to mess with it. So, I repartitioned the SSD to: 30GB for /root, 1GB for /swap, and 100MB for /boot. I installed Linux on the root and the GRUB on boot (of the SSD). Now GRUB immediately boots into linux and doesn't allow me to boot to Windows. BUT! If I enable UEFI Boot manager and choose "Windows Boot Manager" after hitting F12, I can boot into Windows 8 normally. I'd say that's pretty ok, except, I'd prefer to have the option to boot into which one or at the very least, default to boot to Windows. 2- I'm concerned that if I now delete the SSD partition, that the boot will break and I won't be able to boot anything! Does this seem like a valid concern? I made that choice of having linux on SSD because I'm going to be training on it, so I expect multiple resets from time to time.

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• Create Business logic Layer, Data Access Layer classes and Stored Procedure scripts from database ta

  Create Business logic Layer, Data Access Layer classes and Stored Procedure scripts from database table

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• Distinguishing the Transport Layer from the Session Layer

  In the OSI communications model, the Session layer manages the creation and removal of the association between two communicating network end points. This can also be called a connection. A connection is maintained while the network end points are communicated between each other in a conversation or session of some unknown length of time. Some connections and sessions only need to last long enough to send a message or a piece of data in one direction. In addition, some sessions may last longer, this typically occurs when one or both of the network end points are  able to terminate it the connection. The transport layer ensures that messages/data are delivered without errors, in sequence, and with no data content losses or data content duplications. It relieves the Session Layer from any concern with the transfer of data between them and their peers. Examples: Session Layer This layer acts like a manager and asks one of its employees (Transport Layer) to move a piece of data/message from one network end-point to another. Transportation Layer This layer takes the request of the Session Layer and moves the data as insturcted, it also double checks the data for any missing or corrupted information after it has been moved. If for some reason the new data does not match the old data then the Transport player will attempt to move the data gain until the data at both locations is in sync.

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• My presentation layer does not match my model layer even though I have no animations

  - by Kevin McCullough

  On iPhone I have a CALayer that I animate via Core Animation. Then at some point I change view controllers. I then return to the view controller with the CALayer and in viewWillAppear: I set the frame and position properties on my layer to move it back to its starting point. Setting these properties changes the model layer but the presentation layer still has the old values and its presentation layer does not update until the next animation I play. In the CA Programming guide it says "You can query an instance of CALayer for its corresponding presentation layer while an animation transaction is in process." Which, to me, implies that the presentation layer should only be different from the model layer during an animation. But there are no animations currently running. I even used kCATransactionDisableActions to ensure that when I set the position property an implicit animation is not started. Does anyone know why my presentation and model layers are out of sync? Thanks.

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• Business layer access to the data layer

  - by rerun

  I have a Business layer (BL) and a Data layer (DL). I have an object o with a child objects collection of Type C. I would like to provide a semantics like the following o.Children.Add("info"). In the BL I would like to have a static CLASS that all of business layer classes uses to get a reference to the current datalayer instance. Is there any issue with that or must I use the factory pattern to limit creation to A class in the BL that knows the DL instance.

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• Displaying dual monitor screenshot in "dual fullscreen" mode

  - by ohadsc

  Suppose I take a PNG screenshot on a dual monitor system (let's assume for simplicity they are identical), The screenshot will capture both monitors. Now say I want to display that screenshot in an image viewer (windows photo viewer, xnview, etc) at fullscreen - I will then have to choose which monitor to display it on, distorting the image. Is there a way to strech it accross both monitors (aside of changing the windows display mode in the screen configuration window) ? I am using Windows 7 Thanks

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• Windows 8 fresh install and 12.10 dual boot

  - by Sir Linuxalot

  I have a question concerning Windows 8 and dual booting with Ubuntu 12.10. I've researched answers here, but haven't seen a question that resembles mine exactly: Ubuntu install and dual Boot with Windows 8 UEFI UEFI hardware and dual booting with windows Ubuntu 12.10 wont boot Specifically, I'm pondering installing a fresh install of Windows 8 (for game purposes), and a fresh install of 12.10 and dual booting them. I'm not sure if UEFI is hardware specific or software specific, and I'm worried if I try to implement the dual boot I'm going to run into UEFI issues and have to go through the grief of getting things up and running by following a long and tedious procedure. Can I, starting with Windows 8, then install 12.10 without too much hassle? My current hardware config is: Microstar Motherboard 7514 with an Intel Core 2 Duo processor. The drive I'm thinking of using is a Western Digital TB drive, new out of the box. As always, any help would be appreciated. Thanks.

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• Service Layer which can switch between Web Service Layer and Data Access Layer

  - by Blake Blackwell

  I am building an application that will function as a client-server application, and also as a disconnected client application. I will be using WPF (browser app for client-server application). When interacting with the server's database, I will need to connect using WCF web services. When connecting with the localized database, I will need to connect using the local db's data access layer. What methods/patterns exist for this sort of architecture?

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• Why put a DAO layer over a persistence layer (like JDO or Hibernate)

  - by Todd Owen

  Data Access Objects (DAOs) are a common design pattern, and recommended by Sun. But the earliest examples of Java DAOs interacted directly with relational databases -- they were, in essence, doing object-relational mapping (ORM). Nowadays, I see DAOs on top of mature ORM frameworks like JDO and Hibernate, and I wonder if that is really a good idea. I am developing a web service using JDO as the persistence layer, and am considering whether or not to introduce DAOs. I foresee a problem when dealing with a particular class which contains a map of other objects: public class Book { // Book description in various languages, indexed by ISO language codes private Map<String,BookDescription> descriptions; } JDO is clever enough to map this to a foreign key constraint between the "BOOKS" and "BOOKDESCRIPTIONS" tables. It transparently loads the BookDescription objects (using lazy loading, I believe), and persists them when the Book object is persisted. If I was to introduce a "data access layer" and write a class like BookDao, and encapsulate all the JDO code within this, then wouldn't this JDO's transparent loading of the child objects be circumventing the data access layer? For consistency, shouldn't all the BookDescription objects be loaded and persisted via some BookDescriptionDao object (or BookDao.loadDescription method)? Yet refactoring in that way would make manipulating the model needlessly complicated. So my question is, what's wrong with calling JDO (or Hibernate, or whatever ORM you fancy) directly in the business layer? Its syntax is already quite concise, and it is datastore-agnostic. What is the advantage, if any, of encapsulating it in Data Access Objects?

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• Desktop Fun: Dual Monitor Wallpaper Collection Series 2

  - by Asian Angel

  Last month we brought you the first batch of wallpapers geared specifically towards dual monitor setups. Today we present the second offering in our series of dual monitor wallpaper collections. Note: Click on the picture to see the full-size image—these wallpapers vary in size so you may need to crop, stretch, or place them on a colored background in order to best match them to your screen’s resolution. More Dual Monitor Goodness Desktop Fun: Dual Monitor Wallpaper Collection Series 1 Span the same wallpaper across two monitors or use a different wallpaper for each. Dual Monitors: Use a Different Wallpaper on Each Desktop in Windows 7, Vista or XP For more wallpapers be certain to see our great collections in the Desktop Fun section. Latest Features How-To Geek ETC The 20 Best How-To Geek Linux Articles of 2010 The 50 Best How-To Geek Windows Articles of 2010 The 20 Best How-To Geek Explainer Topics for 2010 How to Disable Caps Lock Key in Windows 7 or Vista How to Use the Avira Rescue CD to Clean Your Infected PC The Complete List of iPad Tips, Tricks, and Tutorials Tune Pop Enhances Android Music Notifications Another Busy Night in Gotham City Wallpaper Classic Super Mario Brothers Theme for Chrome and Iron Experimental Firefox Builds Put Tabs on the Title Bar (Available for Download) Android Trojan Found in the Wild Chaos, Panic, and Disorder Wallpaper

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• Ubuntu 12.10 - Windows 8 Dual Boot (Tried boot-repair) - Dual OS option not showing

  - by Anand Danani

  as title says, this is my first time trying ubuntu. I have been trying since last week with continuous googling and searching, but still no luck. I had win8 x64 installed before, then tried installing Ubuntu 12.10 desktop (dual OS option) I tried like 10 times already, everytime it's showing installation complete, but when i restarted and boot from my HDD, dual boot option is not showing, directly to win8 startup I installed win8 on C before. I had a 104gb free drive to install linux to (it's installed already.. but the dual boot option is now showing) In case it helps, Laptop Model : Acer Aspire 4752 Intel Core i3, 2.30GHz Ram 4GB 64 Bit OS - Windows 8 Pro with Media Center This is the url i got from the boot-repair http://paste.ubuntu.com/1407018/ (it's not win vista, thou it seems showing so in the link) Thanks a lot.. Any help will be greatly appreciated. I really want to get my Linux installed. Ken D

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• The Windows 8 and Ubuntu 12.04 Dual Boot NIghtmare

  - by Steve

  I have done some research as to how to go about this dual-boot, and I am close, but I need some guidance with booting into Windows 8 (Ubuntu is installed). I have a Lenovo Ideapad y510p. I will go over what I have done to dual-boot this laptop, with windows 8 pre-installed, with Ubuntu 12.04: I followed every instruction to the letter for the 97-vote response here, and everything worked fine up until after the repair boot section: Installing on a Pre-Installed Windows 8 System (UEFI Supported) I ran into the following error upon restarting after the repair boot section: error: invalid arch independent elf magic. This error (a grub issue) disabled me from booting into Ubuntu :( After a little googling, I followed the instructions in the reactivating grub 2 section to resolve the error: http://kb.acronis.com/content/1686 I found a possible solution to fixing the Windows 8 boot issue, and tried it: http://webcache.googleusercontent.com/search?q=cache:i9JMyXzzRpYJ:askubuntu.com/questions/279275/dual-boot-problem-windows-8-ubuntu-12-04+&cd=1&hl=en&ct=clnk&gl=us&client=ubuntu I thought the above solution worked, but when I attempt to boot into Windows 8, I get the following missing file error: File: \Boot\BCD Status: 0xc000000e Info: The Boot Configuration Data for your PC is missing or contains errors. Here is some other information that may be useful: I have 3 partitions devoted to Ubuntu. The first, sda8, has a flag bios_grub (1049 kb). The second, sda9, is where everything else is (96.6 GB). The last, sda10, is for swap (8299 MB). My question is: How do I fix the boot configuration for Windows 8? Any help would be greatly appreciated :) Update 1: When I attempt to boot into UEFI mode, I get the following error: invalid arch independent elf magic (the same error I saw in step 2). Update 2: A useful link here I found: Dual booting Ubuntu 12.04: UEFI and Legacy So, this is my 4th time installing Ubuntu on the laptop, and it looks like I need to install it in UEFI mode. Should I scrap it all again, and reinstall? Or is there ANY way of salvaging my installation? At this point, I can't even boot into Windows (although I have an installation cd to fix the windows boot issue, that would ultimately screw over ubuntu). Update 3: After doing a little more browsing around, I found a cool way around this messy grub stuff, using rEFInd. Rod Smith's post here saved me! Installing ubuntu 12.04.02 in uefi mode Now, I am able to dual-boot Windows 8 and Ubuntu and boot into both operating systems :) I have another issue (relating to the boot configuration in the bios) that I will post as a separate question :)

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• dual boot Windows 7 and Ubuntu 11.04, black screen when loading Windows

  - by Sean

  I am proficient with Windows and not so much with Linux. Here is my story: Original system came with Windows 7, got openSUSE installed on the second hard drive, and dual boot for this setup worked fine. Wanted to switch to Windows 7 and Ubuntu 11.04 dual boot so I did a Windows system recovery and it appeared to give me back a fresh Windows 7 install. I then go to install Ubuntu 11.04 and the installer informs me I have multiple operating systems already installed. I go to the advanced partitioning option and sure enough Windows 7 is on /sda while openSUSE is still on /sdb. From here I followed this guide (How to dual-boot Linux and Ubuntu with two hard drives) after I had deleted all the openSUSE partitions on /sdb through the Allocate Drive Space tab of the installer. I make the /boot, swap, /, and /home partitions and set the GRUB into the MBR of the second disk (/dev/sdb). Everything installs fine. I reboot, Windows loads automatically, install EasyBCD and add an entry for Ubuntu into the Windows Boot Manager while assigning the type as GRUB2. Reboot the system and it now shows dual booting options for both Windows and Ubuntu. Problem is: while I can use Ubuntu fine when I try to boot into Windows it just gives me a black screen and after a little while the fans start running crazy. If I restart the computer I will sometimes get the message that my system was put into hibernation mode because the temperature got too high (90C) which I presume is in accordance with the fans going crazy. I have linked the output from the Boot Info Script below, any suggestions on how to fix this issue would be greatly appreciated! UPDATED SCRIPT OUTPUT Boot Info Script output: http://paste.ubuntu.com/682152/

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• How To Dual Boot Windows 7 and Ubuntu in 32GB SSD

  - by Hussain

  In my System I have a 32GB SSD and a 500GB HDD. I want to dual Boot My Windows OS and Ubuntu OS in the Same SSD HardDisk..but i am Unable to do that...afterwards i tried to install Both the OS in my 500 GB HDD, but it then also is Not Dual Booting.... Then i have Tried to Boot my Ubuntu in 32 SSD & Windows 7 in HDD, So While Booting it Starts with Windows 7... So My Question is First of all How To Dual Boot Windows 7 and Ubuntu in 32 GB SSD.. and if Not Possible then... Why is it Not Booting From 500GB HDD.. Please Help Me..... Thanxx in Advance..

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• Can't Dual Boot Ubuntu 12.04 and Windows 7 on Sony Vaio S 15 (2012)

  - by Nathaniel

  I just bought my dad a new laptop for fathers day, a Sony Vaio S 15 (the latest models from Sony) and he wants to dual boot Ubuntu and Windows 7. I put Ubuntu 12.04 on a USB drive and went to install it on the computer, but when I got into the partition part of the install there was no option to dual boot. Only to delete everything and install Ubuntu or 'other'. I installed using the 'other' feature by manually partitioning, however once I installed it the computer wouldn't ever go to grub. From inside windows I used Easy BCD to try and fix the boot loader so it would give the option to boot into Windows 7 or Ubuntu 12.04, but it couldn't detect ANY operating systems on the computer (not even windows). Is it not possible to dual boot on the latest Sony Vaios, or is there a workaround for this?

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• Cannot connect to Internet after using Windows XP on dual booted machine

  - by babelproofreader

  I have a dual booted Windows XP and Ubuntu 10.10 box (AMD64) and have an unusual problem in that after connecting to the internet on Windows I cannot connect using Ubuntu. I don't believe it is actually a problem with configuring my Ubuntu connections because when I get up in the morning Ubuntu connects without any problem - this problem only exists (and persists for at least several hours) if I try to connect using Ubuntu immediately after connecting using Windows. I don't know how long the problem actually lasts because I usually just go to bed and then in the morning I can connect without problems. It is not problem with my provider's service as I have a second Ubuntu 10.10 box which I manually connect and works even when the dual booted one (on Ubuntu) won't. It is a particular problem with the dual booted box. A power down reset does not solve the problem.

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• Application layer vs domain layer?

  - by Louis Rhys

  I am reading Domain-Driven Design by Evans and I am at the part discussing the layered architecture. I just realized that application and domain layers are different and should be separate. In the project I am working on, they are kind of blended and I can't tell the difference until I read the book (and I can't say it's very clear to me now), really. My questions, since both of them concerns the logic of the application and are supposed to be clean of technical and presentation aspects, what are the advantages of drawing a boundary these two?

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• HP Pavilion dv7 dual boot with ubuntu and original win7 issues

  - by Neasy11

  I just bought a hp dv7 and I want to dual boot it with the win7 it came with and ubuntu 12.04.1. I shrunk the C partition to make room for the ubuntu one then downloaded an burnt the iso. Next I booted from the cd and followed the simple instructions until I got to the page of the install to choose the partition where all choices were greyed out and the table was completely blank and the drop down only had one choice. After researching this I found that a main problem might be that I can only have 4 primary partitions and the computer was shipped with the 4 already (system,C,recovery,hp tools). I guess my question is what is the best way to go about completing this dual boot? I have read to delete the hp tools partition or combine it with another, I just want a step by step of how to dual boot this computer, I have done plenty of computers in the past but never ran into these issues that come with an HP (should have got a dell lol)!

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• UEFI Dual-Boot - Ubuntu 12.04.3 + Windows 8.1 (One GPT HDD)

  - by swafbrother

  UEFI Dual-Boot - Ubuntu 12.04.3 + Windows 8.1 (One GPT HDD) Hello, I'm having trouble setting up a dual-boot (Ubuntu 12.04 LTS and Windows 8.1) in my ASUS K55VM laptop's hard drive disk (500 GB). I was mostly following tutorials for doing this, but at some point something has gone wrong. Up to now, I have followed these steps: I formatted my HDD into GPT. I clean-installed Windows 8.1. I didn't prevent Windows from choosing the partitions to use and it created these partitions: A Recovery partition (sda1). An EFI System Partition (sda2). A Microsoft Reserved Partition (sda3). A Windows Data Partition or C drive (sda4). I reduced the Windows Data Partition via Windows' Disk Management. I made a bootable USB Stick with Ubuntu 12.04 LTS from ISO, using Universal USB Installer. I created these partitions for Ubuntu: A Boot partition, mounted at /boot (sda5). A Root partition, mounted at / (sda6). A Swap partition (sda7). In Device for boot loader installation I chose: /dev/sda. Then, when I rebooted, it went straight into Ubuntu. So I installed Boot-Repair, and clicked on Recommended Repair. It automatically did its job without asking for anything. I rebooted and Grub showed up, with a lot of options. At this point I had a decent dual-boot setup; Ubuntu and both Windows entries worked fine: Ubuntu. Windows Boot UEFI Loader. Windows UEFI bkpbootmgfw.efi. I executed this command: sudo grub-install --force /dev/sda5. Then I tried to make Windows 8.1's Boot Manager the main boot manager, so that I could choose which OS to boot into from a menu. I downloaded EasyBCD on Windows. It showed 2 Ubuntu entries and 1 Windows entry. I went into BCD Deployment tab and clicked on Write MBR. At this point, I went into BIOS and made Windows Boot Manager the first boot option. When I rebooted, I got a black screen with the message efidisk read error, and then (I guess) it switched to the next boot option, which is Ubuntu, resulting in Grub showing up. From Grub, Ubuntu entry is working and so are both Windows entries. If I choose Ubuntu, it normally boots into Ubuntu. But if I choose Windows, it goes into Windows' boot manager. In Windows' boot manager, a menu shows up: Ubuntu. Ubuntu. Windows 8.1. If I choose Windows, it boots into Windows without any problem. If I choose Ubuntu, it boots into Grub (back to step 14). Here's my BootInfo Summary: http://paste.ubuntu.com/6698171/ Windows Boot Manager is clearly not working as expected; I can't directly boot into it and I can't boot into it from BIOS either (efidisk read error again). If I want to boot into Windows I need to boot into Grub first, which is the opposite of what I wanted. I need help at this point. What is the best thing I can do? Is there a more reliable and/or simpler way of acomplishing a satisfying dual-boot for this situation? Can someone provide a way for going back to step 8, where I had a more efficient dual-boot setup? If only I could undo what I did with Easy BCD and skip Windows' Boot Menu... Can someone provide a way to fix this mess? Thanks in advance and sorry for the length of this, I wanted to be exhaustive.

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• Extracting the layer transparency into an editable layer mask in Photoshop

  - by last-child

  Is there any simple way to extract the "baked in" transparency in a layer and turn it into a layer mask in Photoshop? To take a simple example: Let's say that I paint a few strokes with a semi-transparent brush, or paste in a .png-file with an alpha channel. The rgb color values and the alpha value for each pixel are now all contained in the layer-image itself. I would like to be able to edit the alpha values as a layer mask, so that the layer image is solid and contains only the RGB values for each pixel. Is this possible, and in that case how? Thanks. EDIT: To clarify - I'm not really after the transparency values in themselves, but in the separation of rgb values and alpha values. That means that the layer must become a solid, opaque image with a mask.

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• Internet is far slower in Ubuntu than Windows 7 on dual-booted machine

  - by Tim

  Edit: I'll leave the original post as-is, but after further investigation, it appears that the problem is something to do with my wi-fi card. Speeds are normal when I connect via cable. Edit 2: Problem was solved. It was something to do with the wireless card drivers. I normally use Windows 7 on my laptop and have internet speeds that are normally about 15-20 Mb/s. I have recently dual-booted with Ubuntu 12.10, and have noticed that internet speeds are drastically slower in Ubuntu. When tested, speeds range from 0.2-2 Mb/s, although occasionally being significantly faster than that or even stopping completely for short periods of time. I've also noticed that when first booting into Ubuntu, speeds start fairly fast, and drop to incredibly slow with a few seconds to a few minutes. There's still some possibility that the issue may be with my ISP, as things seem slower than usual even in Windows, but I suspect that it is related to Ubuntu, as things are far slower in Ubuntu than in Windows. I'm wondering, what could be the cause of this? Potentially relevant information: -I've dual booted before on this machine with earlier versions of Ubuntu (different ISP at the time) with no problem. ISP: Rogers (Major Canadian ISP) System info (Gateway NV53a Laptop): Operating System MS Windows 7 Home Premium 64-bit CPU AMD Phenom II N970 Caspian 45nm Technology RAM 6.00 GB Dual-Channel DDR3 @ 664MHz (9-9-9-24) Motherboard Gateway SJV51_DN (Socket S1G4) Graphics Generic PnP Monitor (1366x768@60Hz) ATI Mobility Radeon HD 4250 (Acer Incorporated [ALI]) Hard Drives 733GB TOSHIBA TOSHIBA MK7559GSXP ATA Device (SATA) Networking info: Connected through Wi-Fi Atheros AR5B97 Wireless Network A

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• Dealing with three Windows partitions in dual boot installation

  - by Tim

  For dual-boot installation of Ubuntu after Windows. Quoted from ubuntuguide If a Windows boot partition exists as a second NTFS partition, it should be left alone. If there is a Windows recovery partition also installed, it can also be left alone as long as there are only two NTFS partitions total on the hard drive (i.e. there is no NTFS boot partition as well). If there are a total of 3 NTFS partitions on the hard drive, then the third Windows NTFS partition (the recovery partition) should be removed after creating Recovery CDs from it (see here). In the last case where Windows has three partitions, I was wondering why it says the recovery partition shall be removed? Is it possible to keep the three and create another extended partition with several logical partitions for installing Ubuntu and dual-booting the two OSes? I plan to dual-boot install Ubuntu 10.04 with existing Windows 7. Following is the layout of the current partitions of my hard drive viewed from Windows 7: So must I remove the Lenovo_Recovery (Q:) partition for the same reason you give for the first question? Thanks and regards!

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