printing barcode vb.net Managing Disks and File Systems in Visual C#.NET

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CHapTER 16
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Managing Disks and File Systems
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DiskPart Microsoft DiskPart version 6.1.7100 Copyright (C) 1999-2008 Microsoft Corporation. On computer: WIN7
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DISKPART> create vdisk file="C:\vdisks\disk1.vhd" maximum=16000
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Volume ### ---------Volume 0 Volume 1 Volume 2 Volume 3 Volume 4
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Ltr --F E R C D
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Label ----------New Volume New Volume
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Fs ----NTFS NTFS NTFS
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Type ---------Simple Simple DVD-ROM Partition Partition
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Size ------20 GB 40 GB 0 B 75 GB 52 GB
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Status --------Healthy Healthy No Media Healthy Healthy
Info --------
System
New Volume
NTFS
DISKPART> select volume 0
Volume 0 is the selected volume.
DISKPART> delete volume
DiskPart successfully deleted the volume.
For additional options, run the command help create vdisk at the DiskPart command prompt . After you create a VHD, you must attach it, create a partition, assign it a drive letter, and format it before it can be used . The following script (which must be run within a DiskPart session) demonstrates how to do this .
create vdisk file="C:\vdisks\disk1.vhd" maximum=16000 attach vdisk create partition primary assign letter=g format
Working with Volumes
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File System Fragmentation
As files are created, deleted, and modified over time, their size and physical location on the hard disk will change . If a file size needs to increase and the hard disk doesn t have room directly adjacent to the existing file, the file system automatically places the new portion of the file where it can find the room and then marks the necessary structures so that the file system can find the entire file when an application needs it . The file is now in two (or more) fragments . Fragmentation is normal behavior and is completely transparent to both applications and users . The problem is that over time, more and more files become fragmented and even highly fragmented, increasing the amount of time that it takes for the hard disk controller to locate all of the fragments . Not only does this slow down file access, but it also places additional stress on the hard disk itself . By default, Windows Vista and Windows 7 will defragment the hard drive at 1:00 A .M . every Wednesday . If the computer is off at this time, defragmentation will start shortly after the computer boots next . Ideally, defragmentation will run when the computer is not in use, minimizing the performance impact . However, the user impact is minimal because the defragmenter uses both low CPU priority and low-priority input/output (I/O) . Unlike earlier versions of Windows, Windows 7 recognizes solid-state drives (SSDs) and disables automatic defragmentation . Defragmentation does not improve the performance of SSDs and can decrease the lifetime of the SSD by unnecessarily reading and writing data . HoW it WoRKS
Defragmentation Algorithm Improvements
any systems administrators have been captivated by the graphical defragmentation displays in previous versions of Windows. You ll notice the graphics are
gone in Windows Vista and Windows 7. Unfortunately, displaying the layout of files and highlighting files that had even one fragmentation made many performancefocused administrators obsessed with eliminating every single fragmented file. Fragmentation does reduce disk performance, but having a few fragments in a large file doesn t make a difference even years of reading and writing a large file with a single fragment would never add up to a significant amount of time. For this reason, Microsoft tweaked the defragmentation algorithm so that it does not defragment a file if a segment is longer than 64 MB. In those circumstances, the relatively significant effort required to rearrange files just to combine two 64-MB fragments isn t worth the effort, so Windows doesn t bother. If you run a different defragmentation tool (including the defragmenter in Windows Xp), those fragments will show up, and they ll probably look significant because the fragmented file is so large. (Typically, the entire file appears red if it has even a single fragment.) Trust the algorithm, though a few fragments don t matter.
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Managing Disks and File Systems
To defragment a file system or configure the automatic disk defragmentation schedule manually, follow these steps:
1. 2. 3.
Click Start and then click Computer . Right-click the drive and then click Properties . Click the Tools tab and then click Defragment Now . The Disk Defragmenter appears, as shown in Figure 16-1 .
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