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When you uninstall a prerelease version of any software, you might encounter problems. At some point, you might have no choice but to reformat your hard disk and reinstall your operating system. This situation is not uncommon when you work with prerelease software, but this problem has a solution. Before beginning the uninstall procedure, and as a precautionary measure, be sure to back up all your data. If possible, it s good practice to avoid installing any prerelease versions of any products on your main computer. Using a test machine (or virtual software) will help you avoid losing any important data and won t slow your productivity in the event that something goes wrong. You can learn more about the virtual solution that Microsoft offers, called Microsoft Virtual PC 2007, at http://www.microsoft.com/ windows/virtualpc/default.mspx. Luckily, with Visual Studio 2008, all Community Technology Preview (CTP) and pre Beta 2 versions were time-bombed virtual images provided by Microsoft; therefore, the chance of ruining your main computer has been almost eliminated. You simply have to delete the Virtual PC image provided by Microsoft, and you should be good to go with the released version of the product. But if you installed Visual C# 2008 Express Edition Beta 2 and you didn t use a Virtual PC image, you will have to uninstall the beta version before you proceed with installing the released version.

Compression adds overhead to the system because a compressed NTFS file is decompressed, copied, and then recompressed as a new file even when the file is copied in the same computer. If your server is CPU-bound, avoid using compression. For more information about compression, see File Compression earlier in this chapter.

Windows Messenger is readily available on your Windows XP computer by clicking Start, All Programs. To begin using Windows Messenger, all you need is an Internet connection

If users frequently search for files on NTFS volumes in computers running Windows XP Professional, reduce search times dramatically by enabling Indexing Service. Indexing Service also works well when users search for content inside documents. After you enable Indexing Service, it uses system resources to build and maintain its index, and NTFS begins tracking all file changes in the NTFS change journal. Both of these actions result in a slight performance decrease. However, for volumes that contain frequently searched files, the benefits gained from increased search speed outweigh the performance impact caused by enabling Indexing Service. For more information about Indexing Service, see Indexing Service earlier in this chapter.

Each file and folder on an NTFS volume contains an attribute called Last Access Time. This attribute shows when the file or folder was last accessed, such as when a user performs a folder listing, adds files to a folder, reads a file, or makes changes to a file. The most up-to-date Last Access Time is always stored in memory and is eventually written to disk within two places:

The file s attribute, which is part of its MFT record. A directory entry for the file. The directory entry is stored in the folder that contains the file. Files with multiple hard links have multiple directory entries.

(see 4, Configuring Internet Connections ) and a Microsoft .NET Passport. If you want to use video or voice with your Windows Messenger calls, you ll also need a sound card, a microphone, and a Web camera.

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The Last Access Time on disk is not always current because NTFS looks for a one-hour interval before forcing the Last Access Time updates to disk. NTFS also delays writing the Last Access Time to disk when users or programs perform read-only operations on a file or folder, such as listing the folder s contents or reading (but not changing) a file in the folder. If the Last Access Time is kept current on disk for read operations, all read operations become write operations, which affects NTFS performance. Note

Your computer is probably already equipped with a sound card see your computer s documentation for details. You can purchase a microphone and a universal serial bus (USB) Web cam inexpensively at your favorite computer store.

File-based queries of Last Access Time are accurate even if all on-disk values are not current. NTFS returns the correct value on queries because the accurate value is stored in memory.

NTFS eventually writes the in-memory Last Access Time to disk as follows. Within the file s attribute NTFS typically updates a file s attribute on disk if the current Last Access Time in memory differs by more than an hour from the Last Access Time stored on disk, or when all in-memory references to that file are gone, whichever is more recent. For example, if a file s current Last Access Time is 1:00 P.M., and you read the file at 1:30 P.M., NTFS does not update the Last Access Time. If you read the file again at 2:00 P.M., NTFS updates the Last Access Time in the file s attribute to reflect 2:00 P.M. because the file s attribute shows 1:00 P.M. and the in-memory Last Access Time shows 2:00 P.M. Within a directory entry for a file lowing events:

NTFS updates the directory entry for a file during the fol-