When running amtapetype in June of 2014 I got:

-> amtapetype -f /dev/st0
Device is busy.  Amtapetype will retry forever; hit ctrl-C to quit.
Drive was busy for 38 seconds.
If this device is used in a changer, you may want to set timeouts appropriately.
Checking for FSF_AFTER_FILEMARK requirement
Applying heuristic check for compression.
Wrote random (uncompressible) data at 145956737.969231 bytes/sec
Wrote fixed (compressible) data at 148237312 bytes/sec      
Compression: disabled
Writing one file to fill the volume.
File 1, block 38947409    
Wrote 2501585797120 bytes at 154519 kb/sec                  
Writing smaller files (25015844864 bytes) to determine filemark.
define tapetype unknown-tapetype {                          
    comment "Created by amtapetype; compression disabled"
    length 2442954880 kbytes
    filemark 7456397 kbytes
    speed 154519 kps
    blocksize 32 kbytes
}
# LEOM is not supported for this drive and kernel
--

Steve
-- 
Steven J. Backus                        Computer Systems Manager
University of Utah                      E-Mail:  [email protected]
Genetic Epidemiology                    Alternate:  [email protected]
391 Chipeta Way -- Suite D              Office:  801.587.9308
Salt Lake City, UT 84108-1266           http://www.math.utah.edu/~backus

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