The following output was generated against a Dell PowerVault 110T:
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# amtapetype -f /dev/sa0
Writing 512 Mbyte   compresseable data:  26 sec
Writing 512 Mbyte uncompresseable data:  76 sec
WARNING: Tape drive has hardware compression enabled
Estimated time to write 2 * 1024 Mbyte: 304 sec = 0 h 5 min
wrote 2258916 32Kb blocks in 6908 files in 27078 seconds (short write)
wrote 2144754 32Kb blocks in 13158 files in 39497 seconds (short write)
define tapetype unknown-tapetype {
    comment "just produced by tapetype prog (hardware compression on)"
    length 74529 mbytes
    filemark 584 kbytes
    speed 2203 kps
}
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Here's a tapetype definition with some comments, just for convenience :)
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define tapetype Dell-DLTVS160 {
    comment "Dell PowerVault 110T DLT VS160 tape drive"
    length 74529 mbytes         # 72.78 Gb
    filemark 584 kbytes
    speed 2203 kbytes           # 2.15 Mb/s
}

Evan Tattam, Wizard Information Services
http://www.wizardis.com.au
[evan.tattam[at]wizardis.com.au]