Re: [RESEND] Hard disk LBA sector count is not always the same

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



DervishD wrote:
    Hi all :)

    I'm resending this because although it doesn't seem to imply a
hard disk failure, I have to repartition this disk and I must do it
using a 2.6 kernel (long story), and I'm afraid that afterwards I
cannot access the last sectors using 2.4 (since sometimes the disk is
detected as being 2103 sectors smaller. I would appreciate any help,
or if someone could point me to a source of information or a more
appropriate mailing list.

    I'm having a problem with my primary hard disk: it inconsistently
reports the number of addressable LBA sectors. At times it reports
156301488 (let's call it '301' from now on) which is the correct one
(I think) and other times it reports 156299375 (I'll call this one
299 from now on), a difference of 2103 sectors. But this is not
arbitrary, I have reproduced the problem. I've done it using a
self-compiled 2.4.29 kernel and a 2.6.10-1-k7 kernel from Debian
unstable. These are the steps:

    STEP 1: From a fully powered off machine, I boot into my 2.4.29
kernel. The kernel log shows the 299 number, as well as does both
hdparm -i and hdparm -I. No matter how many times I reboot these
numbers maintain given I always reboot into 2.4.29.

    STEP 2: I reboot into my Debian system, using 2.6.10 kernel, and
now kernel logs show 301 number, as does hdparm -I. But hdparm -i
shows the 299 number.

    STEP 3: I reboot again into my Debian system. This time all
places show the 301 number: the kernel logs, hdparm -i and -I.

    STEP 4: I reboot into my 2.4.19 kernel, and this time ALL places,
again, show the 301 number. No matter how many times I reboot into
2.4.29 again or even 2.6 (Debian), these numbers doesn't change.

    I've done the same but starting from full power-off into Debian,
and the things went like if we start from STEP 2 above. The only
thing I've seen in the Debian logs that may explain this problem are:

    current capacity is 156299375
    native capacity is 156301488

Hard drives have a feature that can reserve a certain amount of space away from the user.

Linux IDE often does 'set max' to make 100% of the hard drive visible to the OS.

	Jeff



-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux