DECtape reliability?

Al Kossow aek at
Thu Nov 12 12:49:19 CST 2015

On 11/12/15 7:27 AM, Jon Elson wrote:

> LINCtape is essentially identical to DECtape.  I think the directory
> format is different, but I think the block format is the same.  I think
> the tapes are wound in reverse order and the order of increasing block
> numbers is reversed.

Actually the block format is different. "Obverse Compliment" encoding 
was created for DECtape. LINCtape blocks aren't bidirectional.

The actual spec for the 3M tape can be found at
The protective overlay is .04 mils.

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