adb logcat -f log.txt error: couldn't open output file: Read-only file system

Question

On windows (win7), debugging a real phone via USB I want to dump the logcat log into a file on my PC. The rate of data is beyond what is usable in eclipse; and I want the whole

Answer 1

adb logcat > logfile.txt

adb logcat *:E > logfile.txt

If you want only errors filtered.

This works for me on MS Windows 7.