Quoting Jon LaBadie <jon AT jgcomp DOT com>:

> On Sat, Aug 11, 2007 at 02:28:10PM +0100, Rory Beaton wrote:
> >
> > grunt:/usr/sbin # amtapetype  -o -e 80g -f /dev/nst0
> > Writing 512 Mbyte   compresseable data:  94 sec
> > Writing 512 Mbyte uncompresseable data:  82 sec
> > Estimated time to write 2 * 81920 Mbyte: 26240 sec = 7 h 17 min
> > wrote 2490330 32Kb blocks in 95 files in 12562 seconds (short write)
> > wrote 2477223 32Kb blocks in 189 files in 12784 seconds (short write)
> > define tapetype unknown-tapetype {
> >     comment "just produced by tapetype prog (hardware compression off)"
> >     length 78236 mbytes
> >     filemark 4461 kbytes
> >     speed 6272 kps
> > }
> >
>
> DAT tapetype reports have varied as to whether there was any
> filemark at all.  I don't know why.  My own testing on two
> HP DATs (dds2 & dds3) showed no filemarks.
>
> You might do another tapetype run to check if it is consistant.


grunt:/usr/sbin # amtapetype -o -f /dev/nst0
Writing 512 Mbyte   compresseable data:  83 sec
Writing 512 Mbyte uncompresseable data:  83 sec
Estimated time to write 2 * 1024 Mbyte: 332 sec = 0 h 5 min
wrote 2437131 32Kb blocks in 7453 files in 28358 seconds (short write)
wrote 2096995 32Kb blocks in 12865 files in 40050 seconds (short write)
define tapetype unknown-tapetype {
    comment "just produced by tapetype prog (hardware compression off)"
    length 90796 mbytes
    filemark 2011 kbytes
    speed 2212 kps
}


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