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    SubjectRe: over 5Gb missing from a 13.5Gb disk
    In <19991207204423.C17522@win.tue.nl> Guest section DW (dwguest@win.tue.nl) wrote:
    GD> On Tue, Dec 07, 1999 at 09:07:49PM +0300, Khimenko Victor wrote:

    >> > 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.
    >>
    >> Huh ?
    >>
    >> -- cut --
    >> [root@localhost /root]# hdparm -i /dev/ide/hd/c0b0t0u0
    >>
    >> /dev/ide/hd/c0b0t0u0:
    >>
    >> Model=IBM-DJNA-371350, FwRev=J76OA30K, SerialNo=GM0GMGL2059
    >> Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
    >> RawCHS=26310/16/63, TrkSize=0, SectSize=0, ECCbytes=34
    >> BuffType=3(DualPortCache), BuffSize=1966kB, MaxMultSect=16, MultSect=off
    >> DblWordIO=no, maxPIO=2(fast), DMA=yes, maxDMA=2(fast)
    >> CurCHS=1650/255/63, CurSects=26520480, LBA=yes
    >> LBA CHS=825/510/63 Remapping, LBA=yes, LBAsects=26520480
    >> tDMA={min:120,rec:120}, DMA modes: mword0 mword1 mword2
    >> IORDY=on/off, tPIO={min:240,w/IORDY:120}, PIO modes: mode3 mode4
    >> UDMA modes: mode0 mode1 *mode2
    >> -- cut --
    >>
    >> As you can see RawCHS here is 26310/16/63 and all is working like a charm.
    >> As I have EXACTLY same model as Wichert (including FwRev and such) I'm pretty
    >> sure it's something in BIOS and/or recent kernel changes (I'm still using
    >> 2.2.10ac10)...

    GD> You cheat yourself by using a hdparm/kernel combination that lies
    GD> to you. Try hdparm -I to see the truth.

    What's "truth" ? Why do you think I'm need information written on HDD ? I'm not.
    What I need in 99% cases is working HDD. Yes, sometimes it's good to have
    information directly from HDD (if you'll get not RawCHS != 16383/16/63 for
    HDD > 8GiB you can be sure that something is wrong; sometimes serial number
    can be needed, etc) but in most cases you are more interested in kernel
    imagination about HDD. And IF kernel belives in "truth" that RawCHS is
    16383/16/63 (Wichert'scase) you are in trouble. If kernel believes in "lie"
    like shown above (my case) you are fine.

    GD> (Yes, in the good old days "hdparm -i" was useful. These days it gives
    GD> corrupted info, and one needs "hdparm -I".)

    It gives you info from kernel. And in most cases it's what you want.
    Yes, it's not info from HDD but it's what's needed.




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