How to change LBA48 addressing capability
Dan Hensley
dan at dshensley.com
Tue Jul 8 02:59:12 UTC 2008
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.
Here is the output from /dev/sda, which is operating correctly in Fedora
9:
[root at amd64 ~]# hdparm -I /dev/sda
/dev/sda:
ATA device, with non-removable media
Model Number: WDC WD2500JS-00MHB0
Serial Number: WD-WCANK1038714
Firmware Revision: 02.01C03
Standards:
Supported: 7 6 5 4
Likely used: 8
Configuration:
Logical max current
cylinders 16383 16383
heads 16 16
sectors/track 63 63
--
CHS current addressable sectors: 16514064
LBA user addressable sectors: 268435455
LBA48 user addressable sectors: 488397168
device size with M = 1024*1024: 238475 MBytes
device size with M = 1000*1000: 250059 MBytes (250 GB)
Here is the output from /dev/sdb:
[root at amd64 ~]# hdparm -I /dev/sdb
/dev/sdb:
ATA device, with non-removable media
Model Number: WDC WD2500KS-00MJB0
Serial Number: WD-WCANKC798286
Firmware Revision: 02.01C03
Standards:
Supported: 7 6 5 4
Likely used: 8
Configuration:
Logical max current
cylinders 16383 16383
heads 16 16
sectors/track 63 63
--
CHS current addressable sectors: 16514064
LBA user addressable sectors: 268435455
LBA48 user addressable sectors: 268435455
device size with M = 1024*1024: 131071 MBytes
device size with M = 1000*1000: 137438 MBytes (137 GB)
Why is the LBA48 size not the same for both disks, and how can I correct
this?
Dan
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