Keysight E4428C ESG RF Programming Manual page 239

As shown in the examples, waveforms can cause the signal generator to allocate more memory than
what is actually used, which decreases the amount of available memory.
NOTE In the first block of data of volatile memory that is allocated for each waveform file, the file
header requires 512 bytes (N5162A/82A) or 256 bytes (E4438C/E8267D).
Non–Volatile Memory (Keysight MXG)
NOTE
If the Keysight MXG's external USB flash memory port is used, the USB flash memory can
provide actual physical storage of non–volatile data in the SECUREWAVE directory versus
the "virtual" only data.
ARB waveform encryption of proprietary information is supported on the external
non–volatile USB flash memory.
To copy unencrypted data files from an external media (as in USB Flash Drive [UFD]) for
playing on a signal generator, the full filename extension is required (i.e. .MARKER,
.HEADER, .WAVEFORM, etc.). For more information on unencrypted data, refer to
"Commands for Downloading and Extracting Waveform Data" on page 234. For more information
on how to work with files, refer to the User's Guide.
To copy compatible licensed encrypted data files (i.e. .SECUREWAVE) from an external media,
download (copy) the files to the signal generator (refer to the User's Guide for information
on how to work with files). When using the external media along with the signal generator's
Use as or Copy File to Instrument softkey menus, encrypted data files can be automatically
detected by the Keysight MXG, regardless of the suffix (e.g. .wfm, .wvfm, and no suffix, etc.).
These various waveform files can be selected and played by the Keysight MXG. For more
information on encrypted data, refer to "Commands for Downloading and Extracting Waveform
Data" on page 234. When using the Copy File to Instrument, the signal generator prompts the user
to select between BBG Memory and Internal Storage memories as locations to copy the files.
On the N5162A/82A, non–volatile files are stored on the non–volatile internal signal generator
memory (internal storage) or to an USB media, if available.
The Keysight MXG non–volatile internal memory is allocated according to a Microsoft compatible file
allocation table (FAT) file system. The Keysight MXG signal generator allocates non–volatile memory
in clusters according to the drive size (see Table 5-3 on page 232). For example, referring to Table 5-3
on page 232, if the drive size is 15 MB and if the file is less than or equal to 4K bytes, the file uses
only one 4 KB cluster of memory. For files larger than 4 KB, and with a drive size of 15 MB, the
signal generator allocates additional memory in multiples of 4KB clusters. For example, a file that
has 21,538 bytes consumes 6 memory clusters (24,000 bytes).
For more information on default cluster sizes for FAT file structures, refer to Table 5-3 on page 232
and to http://support.microsoft.com/.
Keysight Signal Generators Programming Guide
Creating and Downloading Waveform Files
Waveform Memory
231