User`s guide

Getting Started 2
E6651A User’s Guide 29
Turning the Power OFF (Abnormal Termination)
When the program cannot be terminated normally, terminate
manually by holding down the Power button for more than 5
seconds.
CAUTION
Do not turn the power off while the equipment is reading to or
writing from the internal disk (this includes the OS boot process and
program initiation). Doing so may damage the disk's internal file
system.