[TUHS] PDP-7 UNIX filesystem

Arthur Krewat krewat at kilonet.net
Sat Oct 26 07:34:22 AEST 2019

On 10/25/2019 5:08 PM, Michael Kjörling wrote:
> The only thing resembling "deprecation" of dd that I'm aware of is the
> recommendation I saw many years ago to not use it to copy potentially
> problematic storage media (for data recovery), but to use ddrescue for
> that purpose instead. The reason for this is that with conv=noerror
> (without which it'd simply abort if it encounters an I/O error), dd
> would simply skip past data in the input that it can't read, but not
> adjust any offsets in the output, which wreaks havoc with anything
> where offsets matter (such as in file system metadata).

Which is where conv=sync,noerror comes in. Of course, I have no freakin' 
idea what version of UNIX that came into being. ;)

art k.

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