lkml.org 
[lkml]   [1998]   [Sep]   [18]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
From(Michael Shields)
SubjectRe: tapefs
Date18 Sep 1998 06:24:20 +0000
In article <Pine.LNX.3.95.980917084046.1062B-100000@chaos.analogic.com>,
"Richard B. Johnson" <root@chaos.analogic.com> wrote:
> The TU-77 reel-to-reel counted tape-marks in hardware. This created a
> problem when you first physically mounted a brand-new tape. It would zip
> back and forth on its own, trying to find out where it was. If there were
> no file-marks, it would report "position-lost" which would confuse
DAT audio tapes contain a subcode which, among other things, includes
an absolute-time counter.  This allows you to know that, say, the data
you want starts at time 1:07:04.14, and have it be consistent across
decks.  The absolute time can be read (if you have clean heads) even
during fast-forward and rewind which occur at over 100x normal speed.
If you insert a unrewound tape into a deck, it will immediately read
the subcode to find out its position.  It is a shame that DAT data
drives don't have a feature like this.
-- 
Shields, CrossLink.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:44    [from the cache]
©2003-2008