On Tue, 3 May 2011, Edwin L. Culp W. wrote:

It will be ada0 rather than ad4.  With adaX the weird ATA_STATIC_ID stuff is
gone and ATA disks are now numbered starting from 0 just like SCSI disks use
da0, da1, ... etc.

--
John Baldwin

Thanks, John.  I was afraid that was the answer. Now, II'm really
confused.  I'm guessing that the partitions will notl need to be shown
in fstab (ada0s1a).   What little mind I have left is a blank,
/dev/ad4s1g will be automatically be detected.  Is that correct?

What will I do with my second disk /dev/ad0s1a that is already zero?

The device names change from ad to ada. Slice and partition identifiers don't change. Device numbering is dynamic with ahci. Using labels is an easy way to not have to worry about a device's name or number.

Moving A FreeBSD System To AHCI
http://www.wonkity.com/~wblock/docs/html/ahci.html

FreeBSD Labeled Filesystems
http://www.wonkity.com/~wblock/docs/html/labels.html
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