[TUHS] /dev/drum

Tom Ivar Helbekkmo tih at hamartun.priv.no
Thu Apr 26 15:51:01 AEST 2018

Johnny Billquist <bqt at update.uu.se> writes:

> Uh... DEC STD 144 does not have anything to do with remapping bad
> blocks to replacement good blocks. DEC STD 144 describes how a media
> stores known bad blocks on a disk, so that file system initialization
> can then take whatever action needed to that these blocks are not used
> by anything. In RSX (and VMS), they will be included in a file called
> BADBLK.SYS, and thus be perceived as "used".

Thanks for the clarification, Johnny!

As with so much else these days, DEC STD 144 is available on-line:
Interesting reading -- and the scheme used in RSX and VMS is exactly
as required by the standard in section 4.1: "Small Operating System

Most people who graduate with CS degrees don't understand the significance
of Lisp.  Lisp is the most important idea in computer science.  --Alan Kay
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