Panasonic Toughbook CF-Y4HWPZZBM Operating Instructions Manual page 61

Set the Product Recovery DVD-ROM, and execute step D.
D Press the F10 key.
At the confirmation message, select [Yes] and press the Enter key.
The Setup Utility will close, and the computer will restart.
If [Enter Password] is displayed during the following procedure, enter the
Supervisor Password or User Password.
<When the hard disk backup function has been enabled>
When the message [The Backup function has been enabled...] appears,
press the Y key.
E When the message "Select a number" is displayed, press the 2 key and
perform [2. [Erase HDD]].
(You can cancel this operation by pressing the 0 key.)
The confirmation message will be displayed.
<When the hard disk backup function has been enabled>
When the message [The Backup function has been enabled...] appears,
press the Y key.
When the message [Computer must be rebooted in order to execute
[Erase HDD]] appears, press the R key.
F Press the Y key.
Hard Disk Data Erase Utility will start.
G When [<<<Start menu>>>] is displayed, press the Enter key.
H The approximate time required for erasing data will be displayed.
Press the Space key.
I At the confirmation message, press the Enter key.
The operation of erasing the hard disk starts.
If necessary, the "hard disk data erase" operation can be cancelled
after it has begun by pressing the Ctrl+C key.
If the operation is cancelled before being completed, a part of data will
not be erased.
J The message "Hard disk data has been deleted" will be displayed.
Remove the Product Recovery DVD-ROM, and press any key to shut
down the computer.
If a problem occurred during the operation, an error message will be
displayed.
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