Sony HDPS-M10 Operating Instructions Manual page 51

If an HDD Format Error (error code: F20) appears
Perform the following steps to format the unit's internal hard disk.
1
At first, connect the unit to a computer and backup your data.
Then safely disconnect the drive.
Error code F20 will be shown on the LCD display.
Warning
The following steps will erase all data on your hard disk.
2
Press the CANCEL button 5 times while holding the COPY
button.
The screen below will be displayed.
3
Press COPY button.
The screen below will be displayed.
4
Press COPY button again to start the format.
The screen below will be displayed. The hard disk data will be erased.
The screen below will be displayed upon format completion.
51