#Hardware compression ON:
[root@asdf root]# amtapetype -f /dev/nst0
Writing 512 Mbyte   compresseable data:  25 sec
Writing 512 Mbyte uncompresseable data:  143 sec
WARNING: Tape drive has hardware compression enabled
Estimated time to write 2 * 1024 Mbyte: 572 sec = 0 h 9 min
wrote 885189 32Kb blocks in 2707 files in 12817 seconds (short write)
wrote 874495 32Kb blocks in 5365 files in 17273 seconds (short write)
define tapetype unknown-tapetype {
    comment "just produced by tapetype prog (hardware compression on)"
    length 27999 mbytes
    filemark 128 kbytes
    speed 1915 kps
}

#Hardware compression OFF:
[root@asdf root]# amtapetype -f /dev/nst0
Writing 256 Mbyte   compresseable data:  65 sec
Writing 256 Mbyte uncompresseable data:  65 sec
Estimated time to write 2 * 1024 Mbyte: 520 sec = 0 h 8 min
wrote 1010430 32Kb blocks in 3090 files in 13476 seconds (short write)
wrote 996908 32Kb blocks in 6116 files in 18389 seconds (short write)
define tapetype unknown-tapetype {
    comment "just produced by tapetype prog (hardware compression off)"
    length 32002 mbytes
    filemark 142 kbytes
    speed 2067 kps
}