"b" stands for block device; just like "c" will represent a character device.
I looked all over the place for that kind of information years ago...
strangely, I found in when scanning the man page for 'find'.
>________________________________
> From: "Bob Goodwin ~ Zuni, Virginia, USA" <bobgood...@wildblue.net>
>To: Fedora List <users@lists.fedoraproject.org>
>Sent: Monday, September 23, 2013 3:05 PM
>Subject: permissions -
>
>
>
>I spent the last half hour googling with no success. What does the "b"
>mean and how is it controlled?
>
>[root@box10 bobg]# ll /dev/sdb*
>brw-rw----. 1 root disk 8, 16 Sep 23 14:36 /dev/sdb
>brw-rw----. 1 root disk 8, 17 Sep 23 14:36 /dev/sdb1
>
>Bob
>
>--
>
>http://www.qrz.com/db/W2BOD
>
>box10 Fedora-19 Linux/XFCE
>
>
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