boot up from RedHat installation CD/DVD and execute this code at boot prompt:
Code:
linux rescue
chroot /mnt/sysimage
grub-install /dev/hda
press Ctrl+D two times. machine will reboot and GRUB will be back in business.
Take a look at http://www.linuxforums.org/forum/lin...d-edition.html I have used it several times and it has always worked
Sunday, August 23, 2009
Monday, August 10, 2009
Solution to ‘You may be a victim of software counterfeiting’ Problem
Microsoft has started bugging the users of non genuine copies of Windows. If you are also running a non genuine or pirated copy of Windows then there is a full chance of you getting this notification one day or the other.
The problem was reported by one of our viewers that when she updated her copy of Windows with Windows Update then her system started showing this notification that reads “You may be a victim of software counterfeiting” and “This copy of windows does not pass genuine Windows validation”.
These notifications start coming back again after some time and do not feel good. Though I never encourage piracy but here is how you can remove this problem:
1. Before doing anything serious try restoring your system. If the problem is occurring after the Windows Update then System Restore will surely help.
2. But if it does not then do try this, launch Windows Task Manager.
3. Locate the process “wgatray.exe” and end it.
4. Log in into the Safe Mode and delete the file WgaTray.exe from c:\Windows\System32
5. Also delete the WgaTray.exe from c:\Windows\System32\dllcache
6. Type regedit in Run to open Registry Editor, navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify key.
7. Delete the folder WgaLogon and all of its contents.
8. Restart the PC normally.
The problem was reported by one of our viewers that when she updated her copy of Windows with Windows Update then her system started showing this notification that reads “You may be a victim of software counterfeiting” and “This copy of windows does not pass genuine Windows validation”.
These notifications start coming back again after some time and do not feel good. Though I never encourage piracy but here is how you can remove this problem:
1. Before doing anything serious try restoring your system. If the problem is occurring after the Windows Update then System Restore will surely help.
2. But if it does not then do try this, launch Windows Task Manager.
3. Locate the process “wgatray.exe” and end it.
4. Log in into the Safe Mode and delete the file WgaTray.exe from c:\Windows\System32
5. Also delete the WgaTray.exe from c:\Windows\System32\dllcache
6. Type regedit in Run to open Registry Editor, navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify key.
7. Delete the folder WgaLogon and all of its contents.
8. Restart the PC normally.
Tuesday, July 21, 2009
what are the games in Command & Conquer
what are the games in Command & Conquer?
C&C
Command & Conquer (1995)
Command & Conquer: The Covert Operations (expansion pack) (1996)
Command & Conquer: Sole Survivor (1997)
Command & Conquer: Tiberian Sun (1999)
Command & Conquer: Tiberian Sun: Firestorm (expansion pack) (2000)
Command & Conquer: Renegade (2002)
Command & Conquer 3: Tiberium Wars (2007)
Command & Conquer 3: Kane's Wrath (expansion pack) (2008)
RED ALERT:
Command & Conquer: Red Alert (1996)
Command & Conquer: Red Alert: Counterstrike (expansion pack) (1997)
Command & Conquer: Red Alert: The Aftermath (expansion pack) (1997)
Command & Conquer: Red Alert: Retaliation (1998) - This was a compilation of Counterstrike and The Aftermath released for the PlayStation
Command & Conquer: Red Alert 2 (2000)
Command & Conquer: Yuri's Revenge (expansion pack) (2001)
Command & Conquer: Red Alert 3 (October 2008)
GENERALS:
Command & Conquer: Generals (2003)
Command & Conquer: Generals – Zero Hour (expansion pack) (2003)
C&C
Command & Conquer (1995)
Command & Conquer: The Covert Operations (expansion pack) (1996)
Command & Conquer: Sole Survivor (1997)
Command & Conquer: Tiberian Sun (1999)
Command & Conquer: Tiberian Sun: Firestorm (expansion pack) (2000)
Command & Conquer: Renegade (2002)
Command & Conquer 3: Tiberium Wars (2007)
Command & Conquer 3: Kane's Wrath (expansion pack) (2008)
RED ALERT:
Command & Conquer: Red Alert (1996)
Command & Conquer: Red Alert: Counterstrike (expansion pack) (1997)
Command & Conquer: Red Alert: The Aftermath (expansion pack) (1997)
Command & Conquer: Red Alert: Retaliation (1998) - This was a compilation of Counterstrike and The Aftermath released for the PlayStation
Command & Conquer: Red Alert 2 (2000)
Command & Conquer: Yuri's Revenge (expansion pack) (2001)
Command & Conquer: Red Alert 3 (October 2008)
GENERALS:
Command & Conquer: Generals (2003)
Command & Conquer: Generals – Zero Hour (expansion pack) (2003)
Saturday, June 20, 2009
ISO for OS for XP for DELL(key not required)
http://rapidshare.com/files/242548031/DELLXP.part01.rar
http://rapidshare.com/files/242551359/DELLXP.part02.rar
http://rapidshare.com/files/242555109/DELLXP.part03.rar
http://rapidshare.com/files/242558769/DELLXP.part04.rar
http://rapidshare.com/files/242562293/DELLXP.part05.rar
http://rapidshare.com/files/242566052/DELLXP.part06.rar
http://rapidshare.com/files/242569992/DELLXP.part07.rar
http://rapidshare.com/files/242573607/DELLXP.part08.rar
http://rapidshare.com/files/242578391/DELLXP.part09.rar
http://rapidshare.com/files/242583065/DELLXP.part10.rar
http://rapidshare.com/files/242587918/DELLXP.part11.rar
http://rapidshare.com/files/242544964/DELLXP.part12.rar
http://rapidshare.com/files/242551359/DELLXP.part02.rar
http://rapidshare.com/files/242555109/DELLXP.part03.rar
http://rapidshare.com/files/242558769/DELLXP.part04.rar
http://rapidshare.com/files/242562293/DELLXP.part05.rar
http://rapidshare.com/files/242566052/DELLXP.part06.rar
http://rapidshare.com/files/242569992/DELLXP.part07.rar
http://rapidshare.com/files/242573607/DELLXP.part08.rar
http://rapidshare.com/files/242578391/DELLXP.part09.rar
http://rapidshare.com/files/242583065/DELLXP.part10.rar
http://rapidshare.com/files/242587918/DELLXP.part11.rar
http://rapidshare.com/files/242544964/DELLXP.part12.rar
Monday, June 1, 2009
Sunday, May 3, 2009
Download Full Standalone Offline Installer for Latest Google Chrome.
http://dl.google.com/chrome/install/154.36/chrome_installer.exe
Saturday, May 2, 2009
Download Yahoo Messenger 9 full Setup Offline Installer (Yahoo)
please use this download offline installer for yahoo massenger
http://download.yimg.com/ycs/msg/dl/msgr9/us/ymsgr9us.exe
http://download.yimg.com/ycs/msg/dl/msgr9/us/ymsgr9us.exe
Monday, April 20, 2009
150 run command
As we all know sometimes it’s easier to get to a program or Windows XP utility by just entering a command name. Because its really necessary sometimes. Below you’ll find a list of over 150+ windwos XP “run” commands.
List of Commands :
| Program | Run Command |
| Accessibility Controls | access.cpl |
| Accessibility Wizard | accwiz |
| Add Hardware Wizard | hdwwiz.cpl |
| Add/Remove Programs | appwiz.cpl |
| Administrative Tools | control admintools |
| Adobe Acrobat ( if installed ) | acrobat |
| Adobe Distiller ( if installed ) | acrodist |
| Adobe ImageReady ( if installed ) | imageready |
| Adobe Photoshop ( if installed ) | photoshop |
| Automatic Updates | wuaucpl.cpl |
| Basic Media Player | mplay32 |
| Bluetooth Transfer Wizard | fsquirt |
| Calculator | calc |
| Ccleaner ( if installed ) | ccleaner |
| C: Drive | c: |
| Certificate Manager | cdrtmgr.msc |
| Character Map | charmap |
| Check Disk Utility | chkdsk |
| Clipboard Viewer | clipbrd |
| Command Prompt | cmd |
| Command Prompt | command |
| Component Services | dcomcnfg |
| Computer Management | compmgmt.msc |
| Compare Files | comp |
| Control Panel | control |
| Create a shared folder Wizard | shrpubw |
| Date and Time Properties | timedate.cpl |
| DDE Shares | ddeshare |
| Device Manager | devmgmt.msc |
| Direct X Control Panel ( if installed ) | directx.cpl |
| Direct X Troubleshooter | dxdiag |
| Disk Cleanup Utility | cleanmgr |
| Disk Defragment | dfrg.msc |
| Disk Partition Manager | diskmgmt.msc |
| Display Properties | control desktop |
| Display Properties | desk.cpl |
| Display Properties (w/Appearance Tab Preselected ) | control color |
| Dr. Watson System Troubleshooting Utility | drwtsn32 |
| Driver Verifier Utility | verifier |
| Ethereal ( if installed ) | ethereal |
| Event Viewer | eventvwr.msc |
| Files and Settings Transfer Tool | migwiz |
| File Signature Verification Tool | sigverif |
| Findfast | findfast.cpl |
| Firefox | firefox |
| Folders Properties | control folders |
| Fonts | fonts |
| Fonts Folder | fonts |
| Free Cell Card Game | freecell |
| Game Controllers | joy.cpl |
| Group Policy Editor ( xp pro ) | gpedit.msc |
| Hearts Card Game | mshearts |
| Help and Support | helpctr |
| Hyperterminal | hypertrm |
| Hotline Client | hotlineclient |
| Iexpress Wizard | iexpress |
| Indexing Service | ciadv.msc |
| Internet Connection Wizard | icwonn1 |
| Internet Properties | inetcpl.cpl |
| Internet Setup Wizard | inetwiz |
| IP Configuration (Display Connection Configuration) | ipconfig /all |
| IP Configuration (Display DNS Cache Contents) | ipconfig /displaydns |
| IP Configuration (Delete DNS Cache Contents) | ipconfig /flushdns |
| IP Configuration (Release All Connections) | ipconfig /release |
| IP Configuration (Renew All Connections) | ipconfig /renew |
| IP Configuration (Refreshes DHCP & Re-Registers DNS) | ipconfig /registerdns |
| IP Configuration (Display DHCP Class ID) | ipconfig /showclassid |
| IP Configuration (Modifies DHCP Class ID) | ipconfig /setclassid |
| Java Control Panel ( if installed ) | jpicpl32.cpl |
| Java Control Panel ( if installed ) | javaws |
| Keyboard Properties | control keyboard |
| Local Security Settings | secpol.msc |
| Local Users and Groups | lusrmgr.msc |
| Logs You Out of Windows | logoff |
| Malicious Software Removal Tool | mrt |
| Microsoft Access ( if installed ) | access.cpl |
| Microsoft Chat | winchat |
| Microsoft Excel ( if installed ) | excel |
| Microsoft Diskpart | diskpart |
| Microsoft Frontpage ( if installed ) | frontpg |
| Microsoft Movie Maker | moviemk |
| Microsoft Management Console | mmc |
| Microsoft Narrator | narrator |
| Microsoft Paint | mspaint |
| Microsoft Powerpoint | powerpnt |
| Microsoft Word ( if installed ) | winword |
| Microsoft Syncronization Tool | mobsync |
| Minesweeper Game | winmine |
| Mouse Properties | control mouse |
| Mouse Properties | main.cpl |
| MS-Dos Editor | edit |
| MS-Dos FTP | ftp |
| Nero ( if installed ) | nero |
| Netmeeting | conf |
| Network Connections | control netconnections |
| Network Connections | ncpa.cpl |
| Network Setup Wizard | netsetup.cpl |
| Notepad | notepad |
| Nview Desktop Manager ( if installed ) | nvtuicpl.cpl |
| Object Packager | packager |
| ODBC Data Source Administrator | odbccp32 |
| ODBC Data Source Administrator | odbccp32.cpl |
| On Screen Keyboard | osk |
| Opens AC3 Filter ( if installed ) | ac3filter.cpl |
| Outlook Express | msimn |
| Paint | pbrush |
| Password Properties | password.cpl |
| Performance Monitor | perfmon.msc |
| Performance Monitor | perfmon |
| Phone and Modem Options | telephon.cpl |
| Phone Dialer | dialer |
| Pinball Game | pinball |
| Power Configuration | powercfg.cpl |
| Printers and Faxes | control printers |
| Printers Folder | printers |
| Private Characters Editor | eudcedit |
| Quicktime ( if installed ) | quicktime.cpl |
| Quicktime Player ( if installed ) | quicktimeplayer |
| Real Player ( if installed ) | realplay |
| Regional Settings | intl.cpl |
| Registry Editor | regedit |
| Registry Editor | regedit32 |
| Remote Access Phonebook | rasphone |
| Remote Desktop | mstsc |
| Removable Storage | ntmsmgr.msc |
| Removable Storage Operator Requests | ntmsoprq.msc |
| Resultant Set of Policy ( xp pro ) | rsop.msc |
| Scanners and Cameras | sticpl.cpl |
| Scheduled Tasks | control schedtasks |
| Security Center | wscui.cpl |
| Services | services.msc |
| Shared Folders | fsmgmt.msc |
| Sharing Session | rtcshare |
| Shuts Down Windows | shutdown |
| Sounds Recorder | sndrec32 |
| Sounds and Audio | mmsys.cpl |
| Spider Solitare Card Game | spider |
| SQL Client Configuration | clicongf |
| System Configuration Editor | sysedit |
| System Configuration Utility | msconfig |
| System File Checker Utility ( Scan Immediately ) | sfc /scannow |
| System File Checker Utility ( Scan Once At Next Boot ) | sfc /scanonce |
| System File Checker Utility ( Scan On Every Boot ) | sfc /scanboot |
| System File Checker Utility ( Return to Default Settings) | sfc /revert |
| System File Checker Utility ( Purge File Cache ) | sfc /purgecache |
| System File Checker Utility ( Set Cache Size to Size x ) | sfc /cachesize=x |
| System Information | msinfo32 |
| System Properties | sysdm.cpl |
| Task Manager | taskmgr |
| TCP Tester | tcptest |
| Telnet Client | telnet |
| Tweak UI ( if installed ) | tweakui |
| User Account Management | nusrmgr.cpl |
| Utility Manager | utilman |
| Volume Serial Number for C: | label |
| Volume Control | sndvol32 |
| Windows Address Book | wab |
| Windows Address Book Import Utility | wabmig |
| Windows Backup Utility ( if installed ) | ntbackup |
| Windows Explorer | explorer |
| Windows Firewall | firewall.cpl |
| Windows Installer Details | msiexec |
| Windows Magnifier | magnify |
| Windows Management Infrastructure | wmimgmt.msc |
| Windows Media Player | wmplayer |
| Windows Messenger | msnsgs |
| Windows Picture Import Wizard (Need camera connected) | wiaacmgr |
| Windows System Security Tool | syskey |
| Windows Script host settings | wscript |
| Widnows Update Launches | wupdmgr |
| Windows Version ( shows your windows version ) | winver |
| Windows XP Tour Wizard | tourstart |
| Wordpad | write |
| Zoom Utility | igfxzoom |
Saturday, April 18, 2009
Wednesday, April 8, 2009
RedHat Enterprise Linux 5.3 Download From Rapidshare
http://rapidshare.com/files/218818084/rhel5.3.by_mam.part01.rar
http://rapidshare.com/files/218789965/rhel5.3.by_mam.part02.rar
http://rapidshare.com/files/218789684/rhel5.3.by_mam.part03.rar
http://rapidshare.com/files/218790278/rhel5.3.by_mam.part04.rar
http://rapidshare.com/files/218795920/rhel5.3.by_mam.part05.rar
http://rapidshare.com/files/218818340/rhel5.3.by_mam.part06.rar
http://rapidshare.com/files/218795619/rhel5.3.by_mam.part07.rar
http://rapidshare.com/files/218812640/rhel5.3.by_mam.part08.rar
http://rapidshare.com/files/218817213/rhel5.3.by_mam.part09.rar
http://rapidshare.com/files/218815092/rhel5.3.by_mam.part10.rar
http://rapidshare.com/files/218811742/rhel5.3.by_mam.part11.rar
http://rapidshare.com/files/218817727/rhel5.3.by_mam.part12.rar
http://rapidshare.com/files/218813308/rhel5.3.by_mam.part13.rar
http://rapidshare.com/files/218812387/rhel5.3.by_mam.part14.rar
http://rapidshare.com/files/219000202/rhel5.3.by_mam.part15.rar
http://rapidshare.com/files/219005096/rhel5.3.by_mam.part16.rar
http://rapidshare.com/files/219000518/rhel5.3.by_mam.part17.rar
http://rapidshare.com/files/219006306/rhel5.3.by_mam.part18.rar
http://rapidshare.com/files/219000113/rhel5.3.by_mam.part19.rar
http://rapidshare.com/files/219006682/rhel5.3.by_mam.part20.rar
http://rapidshare.com/files/219002592/rhel5.3.by_mam.part21.rar
http://rapidshare.com/files/218999242/rhel5.3.by_mam.part22.rar
http://rapidshare.com/files/219006751/rhel5.3.by_mam.part23.rar
http://rapidshare.com/files/219007408/rhel5.3.by_mam.part24.rar
http://rapidshare.com/files/219017380/rhel5.3.by_mam.part25.rar
http://rapidshare.com/files/219018283/rhel5.3.by_mam.part26.rar
http://rapidshare.com/files/219017948/rhel5.3.by_mam.part27.rar
http://rapidshare.com/files/218780938/rhel5.3.by_mam.part28.rar
http://rapidshare.com/files/218789965/rhel5.3.by_mam.part02.rar
http://rapidshare.com/files/218789684/rhel5.3.by_mam.part03.rar
http://rapidshare.com/files/218790278/rhel5.3.by_mam.part04.rar
http://rapidshare.com/files/218795920/rhel5.3.by_mam.part05.rar
http://rapidshare.com/files/218818340/rhel5.3.by_mam.part06.rar
http://rapidshare.com/files/218795619/rhel5.3.by_mam.part07.rar
http://rapidshare.com/files/218812640/rhel5.3.by_mam.part08.rar
http://rapidshare.com/files/218817213/rhel5.3.by_mam.part09.rar
http://rapidshare.com/files/218815092/rhel5.3.by_mam.part10.rar
http://rapidshare.com/files/218811742/rhel5.3.by_mam.part11.rar
http://rapidshare.com/files/218817727/rhel5.3.by_mam.part12.rar
http://rapidshare.com/files/218813308/rhel5.3.by_mam.part13.rar
http://rapidshare.com/files/218812387/rhel5.3.by_mam.part14.rar
http://rapidshare.com/files/219000202/rhel5.3.by_mam.part15.rar
http://rapidshare.com/files/219005096/rhel5.3.by_mam.part16.rar
http://rapidshare.com/files/219000518/rhel5.3.by_mam.part17.rar
http://rapidshare.com/files/219006306/rhel5.3.by_mam.part18.rar
http://rapidshare.com/files/219000113/rhel5.3.by_mam.part19.rar
http://rapidshare.com/files/219006682/rhel5.3.by_mam.part20.rar
http://rapidshare.com/files/219002592/rhel5.3.by_mam.part21.rar
http://rapidshare.com/files/218999242/rhel5.3.by_mam.part22.rar
http://rapidshare.com/files/219006751/rhel5.3.by_mam.part23.rar
http://rapidshare.com/files/219007408/rhel5.3.by_mam.part24.rar
http://rapidshare.com/files/219017380/rhel5.3.by_mam.part25.rar
http://rapidshare.com/files/219018283/rhel5.3.by_mam.part26.rar
http://rapidshare.com/files/219017948/rhel5.3.by_mam.part27.rar
http://rapidshare.com/files/218780938/rhel5.3.by_mam.part28.rar
Tuesday, April 7, 2009
What Is Mkv And How To Convert Mkv To Mp4, Avi, Wmv, Mov, Mpg, 3gp, Ipod, Zune, Psp Etc?
Lately, a new format MKV emerged. More and more people start to use MKV. However, lots of people don't know what the MKV is. As seldom players can read it, people may face the problem that they can't use the MKV video. This thread here is to remedy that. I will show you what the MKV is on earth, and how to convert MKV to other popular video format so that your video can be widely used.
What is MKV?
MKV, also known as Matroska, is a multimedia container format. It is not a video or audio compression format. It is an envelope for which there can be many audio, video and subtitles streams, allowing the user to store a complete movie or CD in a single file. Matrosla has incorporates features that you would expect from a modern container format like fast seeking in the file, high error recovery, chapter entries, selectable subtitle streams, selectable audio streams, modularly extendable, streamable over internet (HTTP and RTP audio & video streams), Menus (like DVD's have). MKV is similar to AVI – it is another container format. But MKV is much newer, and can contain all kinds of stuff that doesn't fit into AVI. It also has numerous features that AVI lacks. There's also the difference that windows knows how to open the AVI "box" by itself, since the format was developed by Microsoft in the first place. MKV, however, was not developed by Microsoft and windows do not handle MKV by itself.
How to convert MKV to MP4, AVI, WMV, MOV, MPG, 3GP, iPod, Zune, PSP, .etc?
As seldom players support this format, we'd better convert it to popular video format such as mp4, wmv, 3gp or others when we use it. We may use Nidesoft MKV Converter to convert it to all the popular video and audio format you want, as this converter support very comprehensive video formats. After download and install this program, you only need three steps to do it:
Step 1: click add button to add your mkv video from your computer. This converter support batch conversion, so you may add several video files at one time.

Step 2: click the format list to choose your profile. Here you may choose the output format you want.
Step 3: click the convert button to start conversion. The conversion will be completed in a short time.
You could also set the video size, crop mode, video quality and audio quality for your output videos by yourself.
Ok, now you have convert your MKV files to other format files and you may use it more convenient.
What is MKV?
MKV, also known as Matroska, is a multimedia container format. It is not a video or audio compression format. It is an envelope for which there can be many audio, video and subtitles streams, allowing the user to store a complete movie or CD in a single file. Matrosla has incorporates features that you would expect from a modern container format like fast seeking in the file, high error recovery, chapter entries, selectable subtitle streams, selectable audio streams, modularly extendable, streamable over internet (HTTP and RTP audio & video streams), Menus (like DVD's have). MKV is similar to AVI – it is another container format. But MKV is much newer, and can contain all kinds of stuff that doesn't fit into AVI. It also has numerous features that AVI lacks. There's also the difference that windows knows how to open the AVI "box" by itself, since the format was developed by Microsoft in the first place. MKV, however, was not developed by Microsoft and windows do not handle MKV by itself.
How to convert MKV to MP4, AVI, WMV, MOV, MPG, 3GP, iPod, Zune, PSP, .etc?
As seldom players support this format, we'd better convert it to popular video format such as mp4, wmv, 3gp or others when we use it. We may use Nidesoft MKV Converter to convert it to all the popular video and audio format you want, as this converter support very comprehensive video formats. After download and install this program, you only need three steps to do it:
Step 1: click add button to add your mkv video from your computer. This converter support batch conversion, so you may add several video files at one time.
Step 2: click the format list to choose your profile. Here you may choose the output format you want.
Step 3: click the convert button to start conversion. The conversion will be completed in a short time.
You could also set the video size, crop mode, video quality and audio quality for your output videos by yourself.
Ok, now you have convert your MKV files to other format files and you may use it more convenient.
Creating Bootable Cds
There are many applications for bootable CD-ROMs (we'll call them BCDs) - the most common being when undertaking large roll-outs and when using test rigs, where it is often useful to combine operating systems with boot and diagnostic diskettes to automate the process of setting up machines.
If you need to repeatedly test from clean installations it can save lots of time if you image a disk drive and put the image, along with the imaging software, on a BCD.
It can also be a timesaver to have frequently used boot and diagnostic diskettes on CD, and it's an easy way to work with PCs that do not have a floppy disk drive.
To see if a PC supports booting from a CD, check your BIOS set-up screens. SCSI drives have their own BIOS on the adapter; IDE drives use code in the system BIOS. Most modern SCSI adapters have a BIOS that allows it, and most motherboards of the last two years support booting from IDE CD drives.
If you are able to change the boot options, and it lists "CD-ROM", your system supports booting from a CD. If you have a 1995 or 1996 motherboard or SCSI card that does not support it, it's probably worth contacting the manufacturer -many have BIOS upgrades available.
Technical Details
When a BCD is created, a "boot record" is put at the very beginning of the CD, just as it is with a bootable floppy or hard disk.
This record specifies whether the CD is to emulate a floppy or hard disk drive, and contains a pointer to the location of the actual boot image file.
The El Torito specification, created by IBM and Phoenix Technologies, was designed to be completely compatible with the ISO 9660 CD standard. It adds to the ISO 9660 specification by requiring a boot record at sector 11 of the last session on the CD.
The boot record contains an absolute sector number that points to the "boot catalog". There's no restriction on the location of the boot catalog. The catalog contains a list of entries describing all the "boot images" present on the CD. Again, there's no restriction on where the boot images can be on the CD. There can be any number of them, of three different types:
1. "Bootable emulation" causes the image to be mapped to drive A or C, as a conventional bootable storage device.
2. "Non-bootable emulation" maps the image as a conventional storage device, and allocates the last drive letter to it.
3. "No emulation" is a special mode which loads the image into memory and executes it -extremely useful when developing copy protection or "smart" CDs designed for a variety of disparate systems. For example, the "no emulation" mode is used in the Windows NT operating system CDs.
There is much scope for system vendors to create multi-image CDs where the boot image is selected dynamically by the system BIOS, but this requires a lot of manual assembling and editing, and is beyond the range of this article.
Although it is relatively easy to manually assemble the boot catalog, most BIOSes do not allow selection of the image and you will have to write a small amount of low level system code to do it. CDs can be set to boot as drive A or C. The fact that they are a late addition to the PC makes them subject to certain other restrictions.
To boot as drive A, the boot image must be made in the same format as a 1.2 MB, 1. 4 MB or 2. 88 MB floppy disk. The first floppy disk drive, if present, will become the B drive. If the system has a second floppy disk drive, it will not be accessible.
If you need to repeatedly test from clean installations it can save lots of time if you image a disk drive and put the image, along with the imaging software, on a BCD.
It can also be a timesaver to have frequently used boot and diagnostic diskettes on CD, and it's an easy way to work with PCs that do not have a floppy disk drive.
To see if a PC supports booting from a CD, check your BIOS set-up screens. SCSI drives have their own BIOS on the adapter; IDE drives use code in the system BIOS. Most modern SCSI adapters have a BIOS that allows it, and most motherboards of the last two years support booting from IDE CD drives.
If you are able to change the boot options, and it lists "CD-ROM", your system supports booting from a CD. If you have a 1995 or 1996 motherboard or SCSI card that does not support it, it's probably worth contacting the manufacturer -many have BIOS upgrades available.
Technical Details
When a BCD is created, a "boot record" is put at the very beginning of the CD, just as it is with a bootable floppy or hard disk.
This record specifies whether the CD is to emulate a floppy or hard disk drive, and contains a pointer to the location of the actual boot image file.
The El Torito specification, created by IBM and Phoenix Technologies, was designed to be completely compatible with the ISO 9660 CD standard. It adds to the ISO 9660 specification by requiring a boot record at sector 11 of the last session on the CD.
The boot record contains an absolute sector number that points to the "boot catalog". There's no restriction on the location of the boot catalog. The catalog contains a list of entries describing all the "boot images" present on the CD. Again, there's no restriction on where the boot images can be on the CD. There can be any number of them, of three different types:
1. "Bootable emulation" causes the image to be mapped to drive A or C, as a conventional bootable storage device.
2. "Non-bootable emulation" maps the image as a conventional storage device, and allocates the last drive letter to it.
3. "No emulation" is a special mode which loads the image into memory and executes it -extremely useful when developing copy protection or "smart" CDs designed for a variety of disparate systems. For example, the "no emulation" mode is used in the Windows NT operating system CDs.
There is much scope for system vendors to create multi-image CDs where the boot image is selected dynamically by the system BIOS, but this requires a lot of manual assembling and editing, and is beyond the range of this article.
Although it is relatively easy to manually assemble the boot catalog, most BIOSes do not allow selection of the image and you will have to write a small amount of low level system code to do it. CDs can be set to boot as drive A or C. The fact that they are a late addition to the PC makes them subject to certain other restrictions.
To boot as drive A, the boot image must be made in the same format as a 1.2 MB, 1. 4 MB or 2. 88 MB floppy disk. The first floppy disk drive, if present, will become the B drive. If the system has a second floppy disk drive, it will not be accessible.
Monday, March 30, 2009
Subscribe to:
Posts (Atom)



























