is MinBlock == MaxBlock common?

[Dan Langille]

How common is it for a device to have a MinBlock == MaxBlock as in 
the following?

I ask this because this is what it showing up after I patched my 
sa(4).  See 
http://docs.freebsd.org/cgi/getmsg.cgi?fetch=43376+0+current/freebsd-
scsi for details.

# /usr/local/sbin/tapeinfo -f /dev/pass0
Product Type: Tape Drive
Vendor ID: 'WANGTEK '
Product ID: '51000  SCSI M74H'
Revision: '12B3'
Attached Changer: Yes
MinBlock:512
MaxBlock:512
Ready: yes

And from dmesg:

sa0 at ahc0 bus 0 target 2 lun 0
sa0: <WANGTEK 51000  SCSI M74H 12B3> Removable Sequential Access SCSI-
CCS device
sa0: 3.300MB/s transfers

Thanks
-- 
Dan Langille : http://www.langille.org/