Scheduling Tasks

As you use your system,you will have to perform the same tasks over and over
again.If such a task can run unattended,you can schedule that task at a time
when it does not interfere with your work and does not stress the computer
while you are using it.Another advantage is that once you add a job to the list,it
will automatically run,without you having to remember to run it manually.Of
course,it is good practice to regularly check to see if these jobs produced any
errors.An example of a job you can run unattended is the command-line utility
defrag.You can make sure that this utility will be run every week at a particular
time,assuming you have the computer up and running at that time.To schedule
defrag,you may want to create a batch script to run one or more subsequent
defragmentations.
You can start Scheduled Tasks from All Programs | Accessories |
System Tools,which will open an Explorer window .The right
pane shows all scheduled tasks and an Add Scheduled Task Wizard at the top of
the list.
You maintain Scheduled Tasks in an Explorer window because every task is a
?le with a special ?le type that is identi?ed with the extension .job.These jobs
are located in the folder C:\WINDOWS\TASKS (assuming that you do not
have a multiboot system where the drive letter may be something else then C:\).
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The Limitations of Disk Defragmenter

The best way to identify the usage of Disk Defragmenter is to quote Microsoft
from its Knowledgebase document ìRunning Windows 2000 Disk Defragmenter
Requires Administrator Privilegesî(Article ID Q231176):
ìDisk Defragmenter was designed primarily for stand-alone workstations or
servers whose users have the ability to log on locally with administrator privi-
leges.Disk Defragmenter is not intended to be a tool for administrators to main-
tain networked workstations.î
Taking this into account,along with information from the documents
ìWindows 2000 Disk Defragmenter Limitationsî(Article ID Q227463) and
ìFiles Excluded by the Disk Defragmenter Toolî(Article ID Q227350) we come
up with the following limitations of Disk Defragmenter:
It can only be used by users with administrator rights.
It can only be started from the console.

It can only defragment local volumes,thus not networked volumes.
It can only defragment one volume at a time.
Only one copy of Disk Defragmenter can run at a time.
It canít scan a volume while defragmenting another volume.
It canít defragment the MFT and Paging ?le(s).
It can only run a complete defragment process if at least 30 percent of
disk space is free (this is a rule of thumb).
It canít run in a Windows script,nor can it run as a scheduled task;you
need the command-line version of Disk Defragmenter,called defrag.
It can only run at normal priority and needs to compete with other
running applications.
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