http://www.openbsd.org/faq/faq1.html#WhatsNew says: diskmap(4) interface People using USB attached storage or softraid(4) configurations often had difficulty with drive identifiers changing from boot to boot, or between hardware configurations. diskmap(4) allows you to mount drives by unique disklabel UIDs rather than how they are attached, so now you can use the same /etc/fstab on your USB flash disk without worrying wheter it would come up as sd0, sd1 sd2, etc.
http://www.openbsd.org/faq/faq14.html#flashmemLive says: If your target machine has an ahci(4) or SCSI interface, you will probably find your USB drive's identifier changing. Having multiple versions of your /etc/fstab file may make this easier to "fix" (in single user mode). -------Question Would somebody rewrite #flashmemLive section for the diskmap interface change? or how to edit the /etc/fstab for live USB device without worrying wheter it would come up as sd0, sd1 sd2, etc.
