# ./amtapetype -c -f /dev/nst0
Writing 256 Mbyte   compresseable data:  37 sec
Writing 256 Mbyte uncompresseable data:  114 sec
WARNING: Tape drive has hardware compression enabled
Estimated time to write 2 * 1024 Mbyte: 912 sec = 0 h 15 min

# ./amtapetype -e 20g -f /dev/nst0
Writing 256 Mbyte   compresseable data:  37 sec
Writing 256 Mbyte uncompresseable data:  114 sec
WARNING: Tape drive has hardware compression enabled
Estimated time to write 2 * 20480 Mbyte: 1856 sec = 0 h 30 min
wrote 524240 32Kb blocks in 80 files in 7414 seconds (short write)
wrote 527436 32Kb blocks in 161 files in 7414 seconds (short write)


define tapetype Dell-PV100T-DDS4 {
    comment "just produced by tapetype prog (hardware compression on)"
    length 16432 mbytes
    filemark 0 kbytes
    speed 2269 kps
}


Question:  Is it better to have hw compression turned off?  Another poster got 
a measured length of 19457 mbytes.  Or is this deceptive since I'll be 
getting roughly 1.3 to 2 times the amount of space listed in my measured 
length due to the hw compression?  Just curious.