Robie,
For what it's worth:
A) No two vendors implement QIC-113 the same.
B) Many times there are variations from the same vendor.
C) Trying to write generalized code to handle all variations is a nightmare.
I would be more than willing to help whenever I can.
djg
>
> Hi Robie,
>
> [EMAIL PROTECTED] writes:
>
> > To anyone familiar with QIC-113g (possibly just Claus):
> >
> > I just got to writing the code which locates the directory section of
> > the volume, and I think I've come across a problem. Could someone just
> > check a bit of the specification for me, and check if I'm right?
> >
> > From QIC-113g, section 7.1.1 (bottom of page 14):
> > When the bit [directory last] is set the File Set Directory shall
> > be segment aligned and located by subtracting the Directory
> > Section Size (offsets 92-95) rounded up to an integral number
> > of segments from the Ending Segment Number (offsets 6-7). This
> > is to accomodate finding the start of the Directory Section.
> >
> > "rounded up to an integral number of segments" is very confusing. Do I
> > assume a segment size of 32K, 29K, or work it out for each individual
> > segment (the Directory Section Size is specified in bytes)?
>
> Surely they mean 29k - #bads (where #bads is the number of bad sectors).
>
> > Question: algorithm for locating the directory section segment starting
> > number?
>
> > Problem: segment sizes vary. If there are too many bad sectors there,
> > then I'll get the wrong segment.
>
> > I could account for bad sectors to locate it, but who knows whether
>
> Right. Take the directory section size. Then take the data size of the
> last segment of the volume and subtract it from the directory segment
> size.
>
> Continue with the pre-last segment (and so on) until the result
> becomes <= 0.
>
> > I could account for bad sectors to locate it, but who knows whether
> > other implementations account for it?
>
> Nobody. You have to test it. Or ask Iomega, Seagate or whoever to
> enlight you.
>
> > It would be nice if someone could point out that I'm just being
> > braindead :-)
>
> That's very tempting. But I think I'd better be not THAT nice to you
> :-)
>
> Claus
>
>
> --
> Claus-Justus Heine
> [EMAIL PROTECTED]
> http://www.instmath.rwth-aachen.de/~heine/
>
> Ftape - the Linux Floppy Tape Project
> Home Page : http://www.instmath.rwth-aachen.de/~heine/ftape/
> Mailing-list: [EMAIL PROTECTED]
