What exactly is the lifetime of a data flash log?

Log Analysis -- deprecated Copter Logs -- deprecated
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Hi, I wonder when exactly does a data flash log begin and end?
Wiki says it’s after first arm. I armed, let the propellers spin for some time and then disarmed. But I couldn’t get a new log via MAVlink. Does APM require a restart to create a data flash log?

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[quote=“NickZhang”]Hi, I wonder when exactly does a data flash log begin and end?
Wiki says it’s after first arm. I armed, let the propellers spin for some time and then disarmed. But I couldn’t get a new log via MAVlink. Does APM require a restart to create a data flash log?[/quote]
Are you trying to download the log with a usb cable? You can’t wirelessly with telemetry.