How to change LBA48 addressing capability

Bill Crawford billcrawford1970 at
Tue Jul 8 15:28:46 UTC 2008

2008/7/8 Dan Hensley <dan at>:
> I recently sent an inquiry to this list about fdisk being unable to seek
> one of my two basically identical disks.  Both are Western Digital 250Gb
> disks.
> Unable to seek on /dev/sdb
> This disk operates just fine when booting Fedora Core 6.  However, as
> soon as I boot Fedora 9, I get the above error.  testdisk seems to
> think /dev/sdb is only 137gb, and hdparm confirms something strange.

There are two other possibilities: a jumper on the drive is "clipping"
its capacity, and / or the presence of a "host protected area"
effectively doing the same thing. Check for jumpers on the drive, see
if the "libata.ignore_hpa=1" option is still supported by the current

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