Diskeeper 10 User's Manual

54 Diskeeper Operation
The TVE operates differently from the standard Diskeeper defragmentation engines since it is designed
specifically for very large volumes. For example, when the TVE is defragmenting a volume, the graphic display
usually shown in the Volume Map tab is replaced with numerical data showing the progress of the
defragmentation operation. This reduction in system resource usage pays off in lower CPU consumption and
faster defragmentation of very large volumes. (You can optionally disable this resource-saving feature. See
page 52 for more information.)
Also, the TVE may or may not examine the whole volume in a single process. This saves system memory
resources.
Here is a description of the information displayed in the Volume Map tab when the TVE is defragmenting a
volume:
File record examinations
This is the number of times a file record (MFT record) was examined and is basically used to show that
progress is occurring. The number may be larger than the number of file records on the volume if a full job
runs, because a file record may be examined more than once, or it may be smaller than the number of file
records on the volume if the job didn't run to completion.
Fragmented file examinations
This is the number of the above file record examinations that located fragmented files. Again, a file may be
examined more than once during a defragmentation job, so this number will not match the number of
fragmented files reported in the Job Report tab.
Fragments eliminated
This is the number of fragments that were eliminated by the TVE. It may not match the number of fragments
reported in the Job Report tab because the job was only partially completed, or because files became more or
less fragmented as the result of other processes during the period when the engine runs.
Contiguous file examinations
This is the number of the above file record examinations that located contiguous files that could be moved to
help consolidate free space. Not all files on the volume are candidates for this action, so the number will most
likely be far less than the number of contiguous files in the Job Report tab.
Files that could not be processed
This is the number of times that a file couldn't be moved. The most common reasons for a file not moving are:
• Diskeeper was denied permission to open the file (the file did not allow the SYSTEM process Full Control)
• The file was open for exclusive use by another process
• Free space was no longer available when the move was attempted.
The Windows application event log stores the reason(s) for the first fifty files that could not be processed.
Running Diskeeper From the Command Prompt
In addition to its Graphical User Interface (GUI), Diskeeper supports commands from the Windows command
prompt. This provides an alternative method of defragmenting disk volumes. The single command supports
several optional command qualifiers.
To use this command, follow these steps:
1. Open the Windows command prompt window.
2. Type Diskeeper at the command prompt, followed by a drive letter and any of the optional command
parameters.
The Diskeeper command defragments the files of the selected volume. Use the command in this form: