Guralp Systems CMG-DCM build <10,000 - Manual (Page 107)

Operator's Guide
10 Recording and Retrieving Data
Data can be recorded to internal and external storage, in raw GCF
format or in miniSEED format. Data can be browsed via the web
interface or copied to external computers for further processing.
10.1 Preparing removable drives
When a new removable disk is to be used with a CMG-EAM, it must
first be formatted for use. The disk can be formatted by any computer,
but the CMG-EAM also has the capability of formatting the disk itself.
The CMG-EAM accepts disks formatted in either ext3 format (which is
faster and more reliable, but can only be read under Linux systems) or
VFAT format (slower and arguably less reliable, but can be read under
all operating systems). To prepare the disk on a PC, simply format it
with a single partition containing either of the above file-systems; it
can then be inserted directly into a CMG-EAM.
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Note: When using removable disks from CMG-EAMs and CMG-
DCMs with PCs, you may need to provide a power supply for
the disk.
When using a six-circuit
(powered) IEEE1394 FireWire
interface, the disk can draw its
power from the host PC. When
connected to a four-circuit (un-
powered) FireWire interface, such
as Sony i.Link, external power
needs to be applied as described
below. Power also needs to be
supplied when using the USB
interface.
A power supply of between 4.5V
and 30V DC should be connected
to the 2.1mm barrel connector
(lowermost in the picture). The
central pin of the connector
should be connected to the
positive supply line.
IMPORTANT: Do not connect anything to the larger barrel
connector, which is used for the heater and temperature sensor.