[TUHS] Ultrix Tape: Block Size?

William Pechter pechter at gmail.com
Wed Oct 17 03:23:42 AEST 2018

DEC Tape II was the serial driven TU58.
The TK50 was CompacTape or something like that.  It was the predecessor of a number of square tapes...

See DLT on Wikipedia https://en.m.wikipedia.org/wiki/Digital_Linear_Tape


-----Original Message-----
From: Paul Winalski <paul.winalski at gmail.com>
To: Clem Cole <clemc at ccc.com>
Cc: The Eunuchs Hysterical Society <tuhs at tuhs.org>, cctalk at classiccmp.org
Sent: Tue, 16 Oct 2018 13:14
Subject: Re: [TUHS] Ultrix Tape: Block Size?

On 10/15/18, Clem Cole <clemc at ccc.com> wrote:
> #$%^ - they >>weren't<< like DECtape from a reliability standpoint ...
>The original DECtape was extremely reliable.  Not so the TK50.
Calling it "DECtape II" was an insult to the original DECtape.  The
problem wasn't so much the drive itself, but the controller.  In an
effort to reduce costs, DEC used a controller that had insufficient
buffering capability for a streaming, block-replacement tape device
such as the TK50.  TK50s were prone to both data-late and overrun

The block size is almost certainly 512 bytes.

-Paul W.

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