Re: over 5Gb missing from a 13.5Gb disk

Jyan-Min Fang (fang@beamer8.physics.yale.edu)
Mon, 6 Dec 1999 17:43:15 -0500 (EST)


check this URL

http://www.storage.ibm.com/techsup/hddtech/djna/djnades.htm

look at the logical layout section.

Bottom line: you need to change the CHS to, either 1650/255/63 or
26310/16/63.

Jyan-Min Fang

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. With heads set to 255, your CHS values would be
> 1650/255/63, which the BIOS and FDISK (and thence the kernel) will understand.
> Try playing around with the disk geometry parameters in your BIOS to change the
> large/normal/lba setting until you achieve those values. (But note: if you
> have Windoze installed, you'll need to back up your disk and reinstall, as it
> changes the mappings!)
>
> Kris
>
>
>
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