Guralp Systems CMG-DCM - Manual (Page 87)

Operator's guide
If you want to check that the hard disk is working, explore its contents,
or format it, you should use the Tools – Disk tools page instead.
At the top of the window are two sets of options, disk.recordas... and
disk.recordfrom....
Data recording formats: disk.recordas
The disk.recordas section tells the DCM which formats to record data
on the disk.You can record simultaneously from any number of ports
and in any number of formats. If you record in several formats
simultaneously, you should make sure that you have the capacity to
store all the data the DCM will produce, or the bandwidth to transfer
it.
For example, if you set all the disk.recordfrom options to yes,
disk.recordas.gcf to yes, and the other formats to no, the DCM will
record GCF data from all serial ports on the disk. This is the default
behaviour.
Files are not immediately written to the disk, but into Flash memory;
the options disk.usagemode and disk.writeinterval, below, control
how often the DCM flushes new data to the disk, and what it will do if
the disk becomes full.
disk.recordas.gcf : Set this to yes to have the DCM record Güralp
Compressed Format data files. We recommend that you leave this
option set to
yes, because Güralp Systems digitizers output natively in
this format. If you record in a different format, and do not keep the
original GCF data, information will be lost.
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