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As simple as that, if you add a new virtual hard drive using VMWare in your virtual machine with Linux and you want to force the re-scan SCSI bus to see the new hard drive when you run, for example: “fdisk -l”. You can force the SCSI bus re-scan with:
# take into account that your new hard drive could be added in different point than "host0"
echo "- - -" > /sys/class/scsi_host/host0/scan