Guralp Systems CMG-DCM build <10,000 - Manual (Page 141)

Acquisition Modules and Platinum Firmware Recording and Retrieving Data
Format filesystem: This drop-down menu allows you to select the format
used when the storage device is reformatted. The current choices are FAT32
and ext4. The ext4 filesystem is more robust and should be used where
possible but it is not currently supported by Microsoft windows. If you need
to read the storage device under windows (for example, by using the
GPIO/USB cable), then you should choose FAT32.
Continuous power: In order to reduce power consumption, gdi­record
does not write continuously to the hard drive. Data are buffered in flash
memory and, at a configurable interval, these data are checked to see which
complete files can be written to a mass storage device. The storage device is
powered down when not in use. If power is not a consideration, certain
options (such as retrieving data to remote systems using scp) are easier if the
power to the storage device is left on continuously. Tick this check-box to
enable continuous power to the storage device.
11.2.1.2 MiniSEED
For some applications, it is more convenient to store the data directly in
mini-SEED format. The second tab of the “Storage and recording” page
controls options related to recording in this format. If recording in mini-SEED
format is enabled, a GDI to Mini-SEED compressor (converter) is started
automatically. See section 12.2 on page 179 for more details.
Selecting the “MiniSEED” tab displays the following screen:
Enabled: MiniSEED recording will be enabled if this check-box is ticked and
disabled otherwise.
File period: This drop-down menu offers a choice of file periods: the options
are 15 or 30 minutes and 1, 2, 3, 4, 6, 12 or 24 hours. If set, for example, to 15
minutes, four files will be generated each hour whereas, if set to 24 hours,
MAN-EAM-0003 141 Issue E - February 2014