cd rom device naming clarification

"Craig Lloyd" <[email protected]> Mon, 5 Jan 2004 16:24:14 -0500
Newsgroups gmane.os.freebsd.configuration
Message-ID <[email protected]>
->Just an info on something I could found nowhere
(searched the device namings section of FreeBSD handbook, 
books, other forums..etc) 

I know that IDE ATAPI cdrom drive is 
acd -> 
acd0 = 1st IDE ATAPI cdrom 
acd1 = 2nd IDE ATAPI cdrom 
acd2 = 3rd IDE ATAPI cdrom 
..etc
My question: why is there mention in FreeBSD manuals
and technicals of acd0a, acd0b..etc Why that letter
at the end (which normaly designates a partition --but 
there's no partitions on a Cd rom!!!)
please also tell me when it should be a,b,c,d,e at the end 
on the cdrom device naming?

OS that I have -> FreeBSD 5.1


Craig Lloyd 

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