On Thu, 26 Nov 2009, George Lule wrote:

> Dear all,I am trying to recover data from (of course) a failed system. 
> According to the resident guy, system was running Fedora Core 4, LVM 
> with 2 SATA drives each 300GB.  However when I try to scan them mdadm 
> --examine --scan /dev/sda1 >> /etc/mdadm/mdadm.conf  or when I try to 
> fdisk them, fdisk /dev/sda1 I get the errors
> 
> <start errors>
> 
> usb-uhci.c: interrupt, status 3, frame# 121
> sda: Unit Not Ready, sense:
> current 00:00 sns = 70 2
> ASC=3a, ASCQ=0
> Raw sense data: 0x70 0x00 0x02  0x00 0x00 0x00 0x02 0x0a 0x3a
> sda : block size assumed to be 512 bytes, disk size 1GB.
> sda: Write Protect is off
>  I/O error: dev 08:00, sector 0
> ldm_validate_partition_table(): Disk read failed.
>  I/O error: dev 08:00, sector 0
> unable to read partition table
> 
> </end errors>
> 
> Please note that am doing this recovery off a Knoppix live CD, but am
> wondering, is it worth proceeding or these drives are completely gone?
> Your advise will be greatly appreciated

It sounds like /dev/sda is completely gone. What about the other drive?

You could use smartctl -A /dev/sda to check whether the drive thinks that 
it's dead or dying, and check the Current_Pending_Sector and 
Offline_Uncorrectable counts to see how many sectors the drive thinks are 
bad. If it's not too many, some of the data may be recoverable from that 
drive.

Cheers, Chris.
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