Bill:
Another excellent explanation and addition to all of your previous posts.
I know I gasped when I first looked at the formula calculations from RDC but a
little time spent in understanding it proved to be worthwhile.
Thanks
Bill
> Date: Thu, 20 Dec 2007 13:22:47 -0500> From: [EMAIL PROTECTED]> Subject: Re:
> Max. number of physical blocks on 3390 track> To: IBM-MAIN@BAMA.UA.EDU> > > >
> > In a message dated 12/20/2007 12:06:21 P.M. Central Standard Time, > [EMAIL
> PROTECTED] writes:> >You can also get the formula calculations retruned from
> a Read Device > Characteristics command to the storage controller.> > What is
> returned are the various constants that must be plugged into the > formula
> and some flag bits that tell what to do with some of the constants.> > >And I
> forget who said it, but the vendor hardware manuals will describe > whats in
> the gap. One item is repeated skip displacement information, if a track > was
> assigned a skip due to a faulty area of the track.> > The skip displacement
> information is always in the gap. If no skips have > been assigned, then the
> skip displacements stored there reflect that no skip > has been assigned.
> This is another aspect of error detection and reliability > that has evolved
> over the decades. The first device with skip displacements > had only one,
> and the 3390 now has seven. What is recorded in each > 2-byte-long skip
> displacement is the relative number of the chunk on the track, > beginning
> with index point, where chunk number of bytes are skipped over in reading >
> and writing.> > Bill Fairchild> Franklin, TN> > > > > >
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