Siemens SOMATOM Spirit Operator's Manual page 247

Operation
Maintenance shutdown
04/2012
During a maintenance shutdown, the system cleans up unused
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pixel data and defragments the image directories for faster
access. This operation may take several hours.
During the maintenance shutdown access to the user interface
or operating system is not possible.
Call up System > Run in the main menu.
✧
Select System Clean Up and Shutdown.
✧
The System Clean Up and Shutdown dialog box is displayed.
Click on Start.
✧
i
If you do not want to exit syngo, click on Cancel. You return to
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the user interface.
Switching the System On and Off
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