🚀 go-pugleaf

intend to use dump/restore forever, I'd sure like to understand how to make
it work.

Here's the problem:  I'm having trouble understanding the man page for the
dump command.  Down under the notes for 'DUMPING TO EXABYTE TAPE', there's
an explanation about setting the s paramter, which specifies tape size in
feet.  They make the claim that a 1.985 Gb Exabyte tape (120 minute 8mm)
would be equivalent to 1,332,183 feet of 1600 bpi reel-to-reel tape.  I
don't see where they get that number.  According to my calculations:

1.985 Gb   1,073,741,824 bytes   8 bits      1 in      1 ft  ~
         * ------------------- * ------ * ---------- * ----- = 888,074 ft
                1 Gb             1 byte   1,600 bits   12 in

rather than 1,332,183 ft.

Where am I going wrong?  Where has my logic gone haywire?

The bottom-line question is:  how do I set dump density and size (in feet)
for a 90m DAT tape?  Oh... this drive does DCLZ compression.

Thanks,

-Patrick Robinson
 Extension Information Systems
 Virginia Tech
 pgr@ramandu.ext.vt.edu