Re: over 5Gb missing from a 13.5Gb disk

Dan Yocum (yocum@fnal.gov)
Tue, 07 Dec 1999 11:46:09 -0600

> 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

___________________________________________________________________________
Dan Yocum | Phone: (630) 840-8525
Linux Research and Development | Fax: (630) 840-6345
Computing Division, OSS Dept. | email: yocum@fnal.gov .~. L
Fermi National Accelerator Lab | WWW: www-oss.fnal.gov/~yocum/ /V I
P.O. Box 500 | // \ N
Batavia, IL 60510 | "TANSTAAFL" /( ) U
________________________________|_________________________________ ^`~'^__X_

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/