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SubjectRe: over 5Gb missing from a 13.5Gb disk
Date
> On Sun, 5 Dec 1999, Kristofer T. Karas wrote:
>
> > Wichert Akkerman wrote:
> >
> >> I'm having a problem with a new IBM IDE disk I just bought
> >> Model=IBM-DJNA-371350, FwRev=J76OA30K, SerialNo=GM0GM088910
> >> Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
> >> RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=34
> > ^^^^^^^^^^^
> >
> > There's your problem. The number of cylinders is here is causing problems, as
> > it is clamped to 2^14. Most BIOSes let you lower this number by increasing the
> > number of phony heads to 255.
>
> Nonsense.
> All large disks will show RawCHS=16383/16/63, entirely independent of the
> BIOS (which is not involved at all). It is the ATA standard.

I don't know if this has been pointed out yet, but Wichert should go read the
Large-Disk mini-HOWTO which is authored by Andries. It has lots of good stuff
in it including an explanation of the 16383 cylinder business.

Of course, I haven't run into this problem after migrating to the 2.2.x
kernels.

Cheers,
Dan



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