[mythtv-users] Hard Drive Problems

[David Brieck Jr.]

This past weekend my master backend froze up hard and wouldn't boot
back up due to hard drive problems.

I was able to boot from a USB stick and my two 1 TB WD Green drives
eventually showed up, however unlikely as it seems, the both seem to
have problems.

The drive that's got me confused the most is currently on /dev/sda.
It's got 38625 hours on it (4.5 yrs). I was able to mount it once
without a problem, but the next time I had to run fsck on it and it
came up with a ton of errors. After the errors were fixed it mounted,
however, here's where it gets even more confusing.

Here's the output from fdisk:

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00047280

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1      121601   976760001   83  Linux

Based on this, you would see that the drive has one partition and you
would assume it was 1 TB. However, that's not what the OS is seeing.

Here's the output of df -h:

Filesystem            Size  Used Avail Use% Mounted on
/dev/sda1             147G  6.8G  133G   5% /mnt/data2

So where did the rest of the drive go? Oddly enough, the SMART data
says there's nothing wrong with the drive, but it is giving me errors
on the other drive. The other drive, mounted on /dev/sdb currently
originally didn't want to mount, but after a few reboots it mounted
without any errors and I was able to pull data off without a problem.

However, here's the SMART data for that drive:

SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE
UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x002f   200   200   051    Pre-fail
Always       -       0
  3 Spin_Up_Time            0x0027   142   124   021    Pre-fail
Always       -       5858
  4 Start_Stop_Count        0x0032   100   100   000    Old_age
Always       -       27
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail
Always       -       0
  7 Seek_Error_Rate         0x002e   200   200   000    Old_age
Always       -       0
  9 Power_On_Hours          0x0032   078   078   000    Old_age
Always       -       16072
 10 Spin_Retry_Count        0x0032   100   253   000    Old_age
Always       -       0
 11 Calibration_Retry_Count 0x0032   100   253   000    Old_age
Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age
Always       -       24
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age
Always       -       19
193 Load_Cycle_Count        0x0032   017   017   000    Old_age
Always       -       550422
194 Temperature_Celsius     0x0022   110   102   000    Old_age
Always       -       37
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age
Always       -       0
197 Current_Pending_Sector  0x0032   192   192   000    Old_age
Always       -       1425
198 Offline_Uncorrectable   0x0030   200   194   000    Old_age
Offline      -       33
199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age
Always       -       0
200 Multi_Zone_Error_Rate   0x0008   148   148   000    Old_age
Offline      -       10543

SMART Error Log Version: 1
Warning: ATA error count 834 inconsistent with error log pointer 1

ATA Error Count: 834 (device log contains only the most recent five errors)
	CR = Command Register [HEX]
	FR = Features Register [HEX]
	SC = Sector Count Register [HEX]
	SN = Sector Number Register [HEX]
	CL = Cylinder Low Register [HEX]
	CH = Cylinder High Register [HEX]
	DH = Device/Head Register [HEX]
	DC = Device Command Register [HEX]
	ER = Error register [HEX]
	ST = Status register [HEX]

This drive is actually younger than the other drive at 16072 (1.8 yrs)
but there are a bunch of errors on the drive.

Was it a pure coincidence that both drives went bad at the same time
or is one of them still good??

I have some replacement drives on the way, but I'm not sure if any
recordings could be recovered from the first drive that seems to be
missing or if I should bother even trying to keep one of these drives
around?

I'm going to try to get a warranty replacement for the newer drive
since it's still in warranty, but the older drive by all rights still
seems like it might be good.

Thoughts?