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the Windows Server 2008 OS; the second GUID shown is the GUID of the RE entry:
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C:\>bcdedit /set {57f9d850-b1b2-11dc-9cfd-e2c6c11635e9} recoverysequence {57f9d854-b1b2-11dc-9cfd-e2c6c11635e9} The operation completed successfully C:\>bcdedit /set {57f9d850-b1b2-11dc-9cfd-e2c6c11635e9} recoveryenabled yes The operation completed successfully
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A new RE boot entry will be written to the BCD and is accessed by opening the advanced boot options menu (F8) and selecting the Repair Your Computer option, as shown in Figure 20-7
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20 TROUBLESHOOTING WINDOWS SERVER 2008 AND VISTA ENVIRONMENTS
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FIGURE 20-7 Selecting the repair option from a locally installed RE
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20 Troubleshooting Windows Server 2008 and Vista Environments
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The advantage of this approach is that you are not prompted to enter an administrator password or select the OS to repair
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After selecting the command prompt from the RE main dialog, a command prompt will open in the X:\sources folder This folder is the PE environment from the media or WIM le loaded into RAM running as the local system account You can do almost anything to the accessible areas Windows RE is essentially the Windows PE environment, which is itself a subset of the Windows Server 2008 OS Many of the normal command-line commands will work in PE and, therefore, RE (such as copy, cd, del, and dir) This is in addition to more powerful commands, such as the net suite of commands (like net start and net stop), and the ipcon g, ping, tracert, and pathping commands for network troubleshooting (even though, by default, the network is not running) Concentrate on the commands that are special to RE or applicable to the RE environment You can also run other commands inside the RE that are available; however, because Windows PE is a subset of Windows Server 2008, there are limitations:
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No support for the NET Framework No Windows On Windows (WOW) support 16-bit applications will not run on a 32-bit Windows PE, and 32-bit applications will not run on a 64-bit Windows PE Windows PE automatically restarts after 24 hours to avoid being used as a normal OS The following APIs are not part of PE, so any application that uses them will fail: access control, NetShow Theater Administration, OpenGL, power options, printing and print spooler, still image, tape backup, terminal services, user pro le, Windows station and desktop, Windows multimedia, and the Windows shell
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Let s rst look at a computer not starting Aside from physical hardware problems (of which memory can be tested using the memory diagnostics), the actual OS load is performed via several stages and information sources
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Windows Recovery Environment
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The BIOS of the computer loads the Master Boot Record (MBR) from the boot disk The MBR gives instruction on the loading boot sector from the system disk; this loads the Windows Boot Manager (bootmgr), which loads the BCD The BCD resides in the \boot\bcd folder on the system volume (or \EFI\Microsoft\Boot for EFI installations stored on the EFI system partition) The BCD holds information about the OSs installed on the computer; when starting an OS, winloadexe is called This in turn calls and starts the main Windows kernel and core services (for example ntoskrnlexe), and then the rest of Windows starts (for example, winlogonexe, and so on) All these sources can be corrupted or erased With the RE, you can recover each of them A new command is available in Windows RE the bootrec command Bootrec is a single command that replaces the MBR boot sector and rebuilds the BCD database in the event of corruption These commands replace the information needed for the OS to start without wiping partition information, so don t fear that they might erase information Delete the BCD database and run the /scanos command, which searches for any OSs that are not currently contained in the BCD database This is why the old database needs to be removed before running it
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C:\>bootrec / xmgr The operation completed successfully C:\>bootrec / xboot The operation completed successfully C:\>del \boot\bcd C:\>bootrec /scanos Scanning all disks for Windows installations Please wait, since this may take a while Successfully scanned Windows installations Total identi er Windows installations: 1 [1] C:\Windows The operating completed successfully
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