...
"Connecting hard disk drive",
"AV camera"
Units of the 900 series have the ability to connect an internal SATA Hard Disk Drive for saving logs, video, etc. To use the recording from an AV camera, an HDD is required.
...
#
# Device type: "VT325", Firmware version: "2.7.1".
# Hostname: "hostname", IP: "192.168.0.199", MAC: "d8:80:39:9e:97:a7"
#
Thu Nov 17 14:23:20 2016 message: USB Flash was inserted
Thu Nov 17 14:23:25 2016 state: Element Onboard Temperature (id=201001) changed state from "unknown" to "normal"
Thu Nov 17 14:23:25 2016 state: Element Onboard Voltage DC (id=203001) changed state from "unknown" to "normal"
Thu Nov 17 14:23:26 2016 state: Element Dry-1 (id=101001) changed state from "unknown" to "normal"
Thu Nov 17 14:23:26 2016 state: Element Dry-2 (id=101002) changed state from "unknown" to "normal"
Thu Nov 17 14:23:30 2016 message: System started up and ready
Thu Nov 17 14:23:41 2016 state: Element GSM Modem (id=404001) changed state from "unknown" to "normal"
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Sensor dump files
Read more about Sensors dump files.