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284 Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide
Creating and Downloading User-Data Files
Signal Generator Memory
(see table on page 284). For example, referring to table on page 284, 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).
On the Agilent MXG the non-volatile memory is also referred to as internal storage and USB media.
The Internal and USB media files /USERS/NONVOLATILE Directory contains file names with full
extensions (i.e. .marker, .header, etc.-).
For more information on default cluster sizes for FAT file structures, refer to Table 7-2 on page 284
and to http://support.microsoft.com/.
Non-Volatile Memory (ESG, PSG, and E8663B)
The signal generator allocates non-volatile memory in blocks of 512 bytes. For files less than or equal
to 512 bytes, the file uses only one block of memory. For files larger than 512 bytes, the signal
generator allocates additional memory in multiples of 512 byte blocks. For example, a file that has
21,538 bytes consumes 43 memory blocks (22,016 bytes).
Memory Size
For the E4438C, E8267D, and E8663B, the maximum volatile memory size for user data is less than
the maximum size for waveform files. This is because the signal generator permanently allocates a
portion of the volatile memory for waveform markers. The values in Table 8 is the total amount of
memory after deducting the waveform marker memory allocation.
The amount of available memory, volatile and non-volatile, varies by signal generator option and the
size of the other files that share the memory. The baseband generator (BBG) options contain the
volatile memory. Table 8 shows the maximum available memory assuming that there are no other
files residing in memory.
Ta b l e 7 - 2
Drive Size (logical volume) Cluster Size (Bytes)
(Minimum Allocation Size)
0 MB - 15 MB 4K
16 MB - 127 MB 2K
128 MB - 255 MB 4K
256 MB - 511 MB 8K
512 MB - 1023 MB 16k
1024 MB - 2048 MB 32K
2048 MB - 4096 MB 64K
4096 MB - 8192 MB 128K
8192 MB - 16384 MB 256K