Keysight Technologies FieldFox N9912A Security Features And Volatility Documentation page 16

Memory Clearing, Sanitization and/or Removal Procedures
Table 6-1
Description and
purpose
Remarks
16
64 MB Flash Memory
It is divided into three partitions: Keysight (42 Mb), FactoryData (2 Mb) and
UserData (20 Mb). Only the UserData partition is accessible by the user.
Notes on the process for erasing the UserData flash memory partition
There are two basic types of files in the UserData partition. One type is
"system" files that are required for normal operation of the firmware. When
the firmware finds one or more of these "system" files missing at boot up,
default versions of these "system" files are written into the partition. Some of
these "system" files may be modified by the user. The second type of files
result from actions by the user (saving traces, saving screen captures, saving
state files, etc.).
When the UserData partition is cleared, all files are removed from the
partition. When the instrument re-boots, the firmware writes default versions
of "system" files that are missing. Thus, clearing the UserData partition does
not permanently interfere with normal operation of the instrument.
There is no "full chip erase" function available on the memory chips used for
the flash memory on the SOM board.
The lowest level erase available on the flash memory is the sector erase. A
sector erase sets all bytes within a given sector to FF (all one's).
The Erase User Data function does the following:
— Performs a sector erase on all sectors in the UserData partition.
— Writes zeros into all bytes in the UserData partition.
— Performs a sector erase on all sectors in the UserData partition.
— The instrument is re-booted
Keysight N991xA/N992xA/N993xA Security Features and Volatility Documentation