Re: Weird result while smart testing a Winchester Digital drive

Meino Cramer wrote:
> Hi,
>
> On my Gentoo - Linux I smart tested (offline) my Winchester Digital
> drive (SATA)
>
>
> smartctl 6.1 2013-03-16 r3800 [x86_64-linux-3.14.13-RT] (local build)
> Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org
>
> === START OF INFORMATION SECTION ===
> Model Family:     Western Digital Caviar Green (AF)
> Device Model:     WDC WD10EARS-00Y5B1
> Serial Number:    WD-WMAV51276611
> LU WWN Device Id: 5 0014ee 001f5fb47
> Firmware Version: 80.00A80
> User Capacity:    1,000,204,886,016 bytes [1.00 TB]
> ...
> and got (beside other things) this report:
>
> 197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       1
> 198 Offline_Uncorrectable   0x0030   200   200   000    Old_age   Offline      -       1
>
> #14  Extended offline    Completed: read failure       90%     14484         4288352511

This LBA 4288352511 is bogus. It is 2+ times larger than disk's max LBA 
(1000204886016 / 512 - 1 = 1953525167).

The value is likely from the old self-test log (-l selftest, -a) which 
was only designed for 28-bit LBA addresses. The firmware apparently 
returns a bogus (32-bit) value for > 28-bit LBAs.

Try the extended self-test log (-l xselftest, -x). It might report the 
correct LBA.


> (the #14 is there due to my fruitless experiments - see below)
>
> The offline test immediately stops when hitting the bad sector. 90% of
> the disk was never tested.
>
> By the way: I started smartctl as 'smartctl -d sat' as recommended by
> 'smartctl -d test'.

Should not make any difference. Option -d test prints the -d TYPE used 
if -d is not specified.


> I swappoffed the swap (...) and did a
>
> dd if=/dev/zero of=/dev/sda2 bs=512 conv=notrunc
>
> and it fails with an I/O-error at a certain point.

This is as expected - the "certain point" is the end of the partition :-)
The dd command lacks a 'count=...' argument.


Thanks,
Christian


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