I obviously needed to be running fdisk on /dev/sda, so from this I see that the bad sector is in a fat32 partition and the example doesn't apply.  
Does the Reallocated Sector count and Current pending sector count indicate a really bad disk?   They were stable at 534 for many months until today when I ran the tests.


desktop:sudo fdisk -lu /dev/sda

Disk /dev/sda: 160.0 GB, 160041885696 bytes
240 heads, 63 sectors/track, 20673 cylinders, total 312581808 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0xa7a57e45

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1              63    12746159     6373048+   b  W95 FAT32
/dev/sda2   *    12746160    53706239    20480040    7  HPFS/NTFS
/dev/sda3        53706240    87302879    16798320    c  W95 FAT32 (LBA)
/dev/sda4        87302880   312575759   112636440    5  Extended
/dev/sda5       271615743   271827359      105808+  83  Linux
/dev/sda6       271827423   272764799      468688+  8e  Linux LVM
/dev/sda7       308432943   312575759     2071408+  82  Linux swap / Solaris
/dev/sda8       272764863   306845279    17040208+  83  Linux
/dev/sda9       306845343   308432879      793768+  82  Linux swap / Solaris
/dev/sda10       87303006   271615679    92156337   83  Linux



On Wed, 2010-04-07 at 09:31 -0600, brad wrote:
smartctl is showing a read failure, and  Reallocated_Sector_Ct RAW_VALUE=830 and Current_Pending_Sector RAW_VALUE=830 (those just jumped from 534 after I ran the tests)

Can someone help me understand this?   Real disk problem?

Thanks

desktop: smartctl -l selftest /dev/sda8
smartctl version 5.38 [i686-pc-linux-gnu] Copyright (C) 2002-8 Bruce Allen
Home page is http://smartmontools.sourceforge.net/

=== START OF READ SMART DATA SECTION ===
SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Short offline       Completed: read failure       60%      8289         57649010
# 2  Extended offline    Completed: read failure       40%      8288         57649010

So, I thought I would try to follow the Bad block HOWTO instructions

desktop: fdisk -lu /dev/sda8

Disk /dev/sda8: 17.4 GB, 17449173504 bytes
255 heads, 63 sectors/track, 2121 cylinders, total 34080417 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x00000000

Disk /dev/sda8 doesn't contain a valid partition table
-----------------------------------------------------------------
desktop:sudo tune2fs -l /dev/sda8 |  grep Block
Block count:              4259840
Block size:               4096
Blocks per group:         32768
~
Since I didn't have a starting sector like the example, I just took b = 57649010*512/4096 = 7206125
~
desktop:sudo debugfs
debugfs 1.41.9 (22-Aug-2009)
debugfs:  open /dev/sda8
debugfs:  testb 7206126
Illegal block number passed to ext2fs_test_block_bitmap #7206126 for block bitmap for /dev/sda8
Block 7206126 not in use