Guralp Systems CMG-DCM build <10,000 - Manual (Page 54)

CMG-EAM (Platinum Firmware)
The gdi2gcf module, know as the GCF compressor, is responsible for
re-blocking GDI samples into GCF blocks. It provides data to all GCF
output modules as well as to the gdi­record module, which writes
GCF files to disk. It has a number of configuration options, which are
described in section 10.2 on page 109.
A similar arrange applies to miniSEED data: the gdi2miniseed
module provides data to the SEEDlink server and to gdi­record.
54 Issue C